doc/bash.ps

%!PS-Adobe-3.0
%%Creator: groff version 1.22.4
%%CreationDate: Mon Jan 31 01:01:42 2022
%%DocumentNeededResources: font Times-Roman
%%+ font Times-Bold
%%+ font Times-Italic
%%+ font Courier
%%+ font Symbol
%%DocumentSuppliedResources: procset grops 1.22 4
%%Pages: 83
%%PageOrder: Ascend
%%DocumentMedia: Default 612 792 0 () ()
%%Orientation: Portrait
%%EndComments
%%BeginDefaults
%%PageMedia: Default
%%EndDefaults
%%BeginProlog
%%BeginResource: procset grops 1.22 4
%!PS-Adobe-3.0 Resource-ProcSet
/setpacking where{
pop
currentpacking
true setpacking
}if
/grops 120 dict dup begin
/SC 32 def
/A/show load def
/B{0 SC 3 -1 roll widthshow}bind def
/C{0 exch ashow}bind def
/D{0 exch 0 SC 5 2 roll awidthshow}bind def
/E{0 rmoveto show}bind def
/F{0 rmoveto 0 SC 3 -1 roll widthshow}bind def
/G{0 rmoveto 0 exch ashow}bind def
/H{0 rmoveto 0 exch 0 SC 5 2 roll awidthshow}bind def
/I{0 exch rmoveto show}bind def
/J{0 exch rmoveto 0 SC 3 -1 roll widthshow}bind def
/K{0 exch rmoveto 0 exch ashow}bind def
/L{0 exch rmoveto 0 exch 0 SC 5 2 roll awidthshow}bind def
/M{rmoveto show}bind def
/N{rmoveto 0 SC 3 -1 roll widthshow}bind def
/O{rmoveto 0 exch ashow}bind def
/P{rmoveto 0 exch 0 SC 5 2 roll awidthshow}bind def
/Q{moveto show}bind def
/R{moveto 0 SC 3 -1 roll widthshow}bind def
/S{moveto 0 exch ashow}bind def
/T{moveto 0 exch 0 SC 5 2 roll awidthshow}bind def
/SF{
findfont exch
[exch dup 0 exch 0 exch neg 0 0]makefont
dup setfont
[exch/setfont cvx]cvx bind def
}bind def
/MF{
findfont
[5 2 roll
0 3 1 roll
neg 0 0]makefont
dup setfont
[exch/setfont cvx]cvx bind def
}bind def
/level0 0 def
/RES 0 def
/PL 0 def
/LS 0 def
/MANUAL{
statusdict begin/manualfeed true store end
}bind def
/PLG{
gsave newpath clippath pathbbox grestore
exch pop add exch pop
}bind def
/BP{
/level0 save def
1 setlinecap
1 setlinejoin
DEFS/BPhook known{DEFS begin BPhook end}if
72 RES div dup scale
LS{
90 rotate
}{
0 PL translate
}ifelse
1 -1 scale
}bind def
/EP{
level0 restore
showpage
}def
/DA{
newpath arcn stroke
}bind def
/SN{
transform
.25 sub exch .25 sub exch
round .25 add exch round .25 add exch
itransform
}bind def
/DL{
SN
moveto
SN
lineto stroke
}bind def
/DC{
newpath 0 360 arc closepath
}bind def
/TM matrix def
/DE{
TM currentmatrix pop
translate scale newpath 0 0 .5 0 360 arc closepath
TM setmatrix
}bind def
/RC/rcurveto load def
/RL/rlineto load def
/ST/stroke load def
/MT/moveto load def
/CL/closepath load def
/Fr{
setrgbcolor fill
}bind def
/setcmykcolor where{
pop
/Fk{
setcmykcolor fill
}bind def
}if
/Fg{
setgray fill
}bind def
/FL/fill load def
/LW/setlinewidth load def
/Cr/setrgbcolor load def
/setcmykcolor where{
pop
/Ck/setcmykcolor load def
}if
/Cg/setgray load def
/RE{
findfont
dup maxlength 1 index/FontName known not{1 add}if dict begin
{
1 index/FID ne
2 index/UniqueID ne
and
{def}{pop pop}ifelse
}forall
/Encoding exch def
dup/FontName exch def
currentdict end definefont pop
}bind def
/DEFS 0 def
/EBEGIN{
moveto
DEFS begin
}bind def
/EEND/end load def
/CNT 0 def
/level1 0 def
/PBEGIN{
/level1 save def
translate
div 3 1 roll div exch scale
neg exch neg exch translate
0 setgray
0 setlinecap
1 setlinewidth
0 setlinejoin
10 setmiterlimit
[]0 setdash
/setstrokeadjust where{
pop
false setstrokeadjust
}if
/setoverprint where{
pop
false setoverprint
}if
newpath
/CNT countdictstack def
userdict begin
/showpage{}def
/setpagedevice{}def
mark
}bind def
/PEND{
cleartomark
countdictstack CNT sub{end}repeat
level1 restore
}bind def
end def
/setpacking where{
pop
setpacking
}if
%%EndResource
%%EndProlog
%%BeginSetup
%%BeginFeature: *PageSize Default
<< /PageSize [ 612 792 ] /ImagingBBox null >> setpagedevice
%%EndFeature
%%IncludeResource: font Times-Roman
%%IncludeResource: font Times-Bold
%%IncludeResource: font Times-Italic
%%IncludeResource: font Courier
%%IncludeResource: font Symbol
grops begin/DEFS 1 dict def DEFS begin/u{.001 mul}bind def end/RES 72
def/PL 792 def/LS false def/ENC0[/asciicircum/asciitilde/Scaron/Zcaron
/scaron/zcaron/Ydieresis/trademark/quotesingle/Euro/.notdef/.notdef
/.notdef/.notdef/.notdef/.notdef/.notdef/.notdef/.notdef/.notdef/.notdef
/.notdef/.notdef/.notdef/.notdef/.notdef/.notdef/.notdef/.notdef/.notdef
/.notdef/.notdef/space/exclam/quotedbl/numbersign/dollar/percent
/ampersand/quoteright/parenleft/parenright/asterisk/plus/comma/hyphen
/period/slash/zero/one/two/three/four/five/six/seven/eight/nine/colon
/semicolon/less/equal/greater/question/at/A/B/C/D/E/F/G/H/I/J/K/L/M/N/O
/P/Q/R/S/T/U/V/W/X/Y/Z/bracketleft/backslash/bracketright/circumflex
/underscore/quoteleft/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y
/z/braceleft/bar/braceright/tilde/.notdef/quotesinglbase/guillemotleft
/guillemotright/bullet/florin/fraction/perthousand/dagger/daggerdbl
/endash/emdash/ff/fi/fl/ffi/ffl/dotlessi/dotlessj/grave/hungarumlaut
/dotaccent/breve/caron/ring/ogonek/quotedblleft/quotedblright/oe/lslash
/quotedblbase/OE/Lslash/.notdef/exclamdown/cent/sterling/currency/yen
/brokenbar/section/dieresis/copyright/ordfeminine/guilsinglleft
/logicalnot/minus/registered/macron/degree/plusminus/twosuperior
/threesuperior/acute/mu/paragraph/periodcentered/cedilla/onesuperior
/ordmasculine/guilsinglright/onequarter/onehalf/threequarters
/questiondown/Agrave/Aacute/Acircumflex/Atilde/Adieresis/Aring/AE
/Ccedilla/Egrave/Eacute/Ecircumflex/Edieresis/Igrave/Iacute/Icircumflex
/Idieresis/Eth/Ntilde/Ograve/Oacute/Ocircumflex/Otilde/Odieresis
/multiply/Oslash/Ugrave/Uacute/Ucircumflex/Udieresis/Yacute/Thorn
/germandbls/agrave/aacute/acircumflex/atilde/adieresis/aring/ae/ccedilla
/egrave/eacute/ecircumflex/edieresis/igrave/iacute/icircumflex/idieresis
/eth/ntilde/ograve/oacute/ocircumflex/otilde/odieresis/divide/oslash
/ugrave/uacute/ucircumflex/udieresis/yacute/thorn/ydieresis]def
/Courier@0 ENC0/Courier RE/Times-Italic@0 ENC0/Times-Italic RE
/Times-Bold@0 ENC0/Times-Bold RE/Times-Roman@0 ENC0/Times-Roman RE
%%EndSetup
%%Page: 1 1
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10.95
/Times-Bold@0 SF -.219(NA)72 84 S(ME).219 E F0(bash \255 GNU Bourne-Ag)
108 96 Q(ain SHell)-.05 E F1(SYNOPSIS)72 112.8 Q/F2 10/Times-Bold@0 SF
(bash)108 124.8 Q F0([options] [command_string | \214le])2.5 E F1
(COPYRIGHT)72 141.6 Q F0(Bash is Cop)108 153.6 Q
(yright \251 1989-2020 by the Free Softw)-.1 E(are F)-.1 E
(oundation, Inc.)-.15 E F1(DESCRIPTION)72 170.4 Q F2(Bash)108 182.4 Q F0
.973(is an)3.474 F F2(sh)3.473 E F0 .973
(-compatible command language interpreter that e)B -.15(xe)-.15 G .973
(cutes commands read from the standard).15 F(input or from a \214le.)108
194.4 Q F2(Bash)5 E F0(also incorporates useful features from the)2.5 E
/F3 10/Times-Italic@0 SF -.4(Ko)2.5 G(rn).4 E F0(and)2.5 E F3(C)2.5 E F0
(shells \()2.5 E F2(ksh)A F0(and)2.5 E F2(csh)2.5 E F0(\).)A F2(Bash)108
211.2 Q F0 .527(is intended to be a conformant implementation of the Sh\
ell and Utilities portion of the IEEE POSIX)3.027 F
(speci\214cation \(IEEE Standard 1003.1\).)108 223.2 Q F2(Bash)5 E F0
(can be con\214gured to be POSIX-conformant by def)2.5 E(ault.)-.1 E F1
(OPTIONS)72 240 Q F0 .483(All of the single-character shell options doc\
umented in the description of the)108 252 R F2(set)2.983 E F0 -.2(bu)
2.983 G .483(iltin command, includ-).2 F(ing)108 264 Q F2<ad6f>2.718 E
F0 2.718(,c)C .218(an be used as options when the shell is in)-2.718 F
-.2(vo)-.4 G -.1(ke).2 G 2.718(d. In).1 F(addition,)2.719 E F2(bash)
2.719 E F0 .219(interprets the follo)2.719 F .219(wing options)-.25 F
(when it is in)108 276 Q -.2(vo)-.4 G -.1(ke).2 G(d:).1 E F2<ad63>108
292.8 Q F0 .868(If the)158 292.8 R F2<ad63>3.368 E F0 .867(option is pr\
esent, then commands are read from the \214rst non-option ar)3.368 F
(gument)-.18 E F3(com-)3.567 E(mand_string)158 304.8 Q F0 5.726(.I).22 G
3.226(ft)-5.726 G .726(here are ar)-3.226 F .727(guments after the)-.18
F F3(command_string)3.427 E F0 3.227(,t).22 G .727(he \214rst ar)-3.227
F .727(gument is assigned)-.18 F(to)158 316.8 Q F2($0)2.919 E F0 .419
(and an)2.919 F 2.919(yr)-.15 G .419(emaining ar)-2.919 F .418
(guments are assigned to the positional parameters.)-.18 F .418
(The assignment)5.418 F(to)158 328.8 Q F2($0)2.5 E F0
(sets the name of the shell, which is used in w)2.5 E
(arning and error messages.)-.1 E F2<ad69>108 340.8 Q F0(If the)158
340.8 Q F2<ad69>2.5 E F0(option is present, the shell is)2.5 E F3(inter)
2.51 E(active)-.15 E F0(.).18 E F2<ad6c>108 352.8 Q F0(Mak)158 352.8 Q
(e)-.1 E F2(bash)2.5 E F0(act as if it had been in)2.5 E -.2(vo)-.4 G
-.1(ke).2 G 2.5(da).1 G 2.5(sal)-2.5 G(ogin shell \(see)-2.5 E/F4 9
/Times-Bold@0 SF(INV)2.5 E(OCA)-.405 E(TION)-.855 E F0(belo)2.25 E(w\).)
-.25 E F2<ad72>108 364.8 Q F0(If the)158 364.8 Q F2<ad72>2.5 E F0
(option is present, the shell becomes)2.5 E F3 -.37(re)2.5 G(stricted)
.37 E F0(\(see)3.27 E F4(RESTRICTED SHELL)2.5 E F0(belo)2.25 E(w\).)-.25
E F2<ad73>108 376.8 Q F0 .602(If the)158 376.8 R F2<ad73>3.102 E F0 .602
(option is present, or if no ar)3.102 F .602
(guments remain after option processing, then commands)-.18 F .617
(are read from the standard input.)158 388.8 R .617(This option allo)
5.617 F .616(ws the positional parameters to be set when)-.25 F(in)158
400.8 Q -.2(vo)-.4 G(king an interacti).2 E .3 -.15(ve s)-.25 H
(hell or when reading input through a pipe.).15 E F2<ad44>108 412.8 Q F0
3.183(Al)158 412.8 S .683(ist of all double-quoted strings preceded by)
-3.183 F F2($)3.184 E F0 .684(is printed on the standard output.)3.184 F
.684(These are)5.684 F .458(the strings that are subject to language tr\
anslation when the current locale is not)158 424.8 R F2(C)2.958 E F0(or)
2.958 E F2(POSIX)2.958 E F0(.)A(This implies the)158 436.8 Q F2<ad6e>2.5
E F0(option; no commands will be e)2.5 E -.15(xe)-.15 G(cuted.).15 E F2
([\255+]O [)108 448.8 Q F3(shopt_option)A F2(])A F3(shopt_option)158
460.8 Q F0 1.097(is one of the shell options accepted by the)3.596 F F2
(shopt)3.597 E F0 -.2(bu)3.597 G 1.097(iltin \(see).2 F F4 1.097
(SHELL B)3.597 F(UIL)-.09 E(TIN)-.828 E(COMMANDS)158 472.8 Q F0(belo)
3.003 E 3.253(w\). If)-.25 F F3(shopt_option)3.253 E F0 .753
(is present,)3.253 F F2<ad4f>3.253 E F0 .753(sets the v)3.253 F .753
(alue of that option;)-.25 F F2(+O)3.252 E F0(unsets)3.252 E 2.624
(it. If)158 484.8 R F3(shopt_option)2.624 E F0 .124
(is not supplied, the names and v)2.624 F .125
(alues of the shell options accepted by)-.25 F F2(shopt)2.625 E F0 .506
(are printed on the standard output.)158 496.8 R .505(If the in)5.505 F
-.2(vo)-.4 G .505(cation option is).2 F F2(+O)3.005 E F0 3.005(,t)C .505
(he output is displayed in a)-3.005 F
(format that may be reused as input.)158 508.8 Q F2<adad>108 520.8 Q F0
(A)158 520.8 Q F2<adad>3.363 E F0 .864
(signals the end of options and disables further option processing.)
3.363 F(An)5.864 E 3.364(ya)-.15 G -.18(rg)-3.364 G .864(uments after)
.18 F(the)158 532.8 Q F2<adad>2.5 E F0
(are treated as \214lenames and ar)2.5 E 2.5(guments. An)-.18 F(ar)2.5 E
(gument of)-.18 E F2<ad>2.5 E F0(is equi)2.5 E -.25(va)-.25 G(lent to)
.25 E F2<adad>2.5 E F0(.)A F2(Bash)108 549.6 Q F0 .304
(also interprets a number of multi-character options.)2.804 F .303
(These options must appear on the command line)5.303 F
(before the single-character options to be recognized.)108 561.6 Q F2
<adad646562>108 578.4 Q(ugger)-.2 E F0 .474(Arrange for the deb)144
590.4 R .474(ugger pro\214le to be e)-.2 F -.15(xe)-.15 G .475
(cuted before the shell starts.).15 F -.45(Tu)5.475 G .475(rns on e).45
F .475(xtended deb)-.15 F(ug-)-.2 E
(ging mode \(see the description of the)144 602.4 Q F2(extdeb)2.5 E(ug)
-.2 E F0(option to the)2.5 E F2(shopt)2.5 E F0 -.2(bu)2.5 G(iltin belo)
.2 E(w\).)-.25 E F2(\255\255dump\255po\255strings)108 614.4 Q F0(Equi)
144 626.4 Q -.25(va)-.25 G(lent to).25 E F2<ad44>2.5 E F0 2.5(,b)C
(ut the output is in the GNU)-2.7 E F3 -.1(ge)2.5 G(tte).1 E(xt)-.2 E F2
(po)2.5 E F0(\(portable object\) \214le format.)2.5 E F2
(\255\255dump\255strings)108 638.4 Q F0(Equi)144 650.4 Q -.25(va)-.25 G
(lent to).25 E F2<ad44>2.5 E F0(.)A F2(\255\255help)108 662.4 Q F0
(Display a usage message on standard output and e)144 662.4 Q
(xit successfully)-.15 E(.)-.65 E F2<adad696e6974ad8c6c65>108 674.4 Q F3
(\214le)2.5 E F2<adad72>108 686.4 Q(c\214le)-.18 E F3(\214le)2.5 E F0
(Ex)144 698.4 Q 1.599(ecute commands from)-.15 F F3(\214le)6.009 E F0
1.598(instead of the standard personal initialization \214le)4.279 F F3
(~/.bashr)3.598 E(c)-.37 E F0 1.598(if the)4.408 F(shell is interacti)
144 710.4 Q .3 -.15(ve \()-.25 H(see).15 E F4(INV)2.5 E(OCA)-.405 E
(TION)-.855 E F0(belo)2.25 E(w\).)-.25 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(1)195.395 E 0 Cg EP
%%Page: 2 2
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(\255\255login)108 84 Q F0(Equi)144 96 Q -.25(va)-.25 G(lent to).25 E
F1<ad6c>2.5 E F0(.)A F1(\255\255noediting)108 112.8 Q F0
(Do not use the GNU)144 124.8 Q F1 -.18(re)2.5 G(adline).18 E F0
(library to read command lines when the shell is interacti)2.5 E -.15
(ve)-.25 G(.).15 E F1(\255\255nopr)108 141.6 Q(o\214le)-.18 E F0 .017
(Do not read either the system-wide startup \214le)144 153.6 R/F2 10
/Times-Italic@0 SF(/etc/pr)4.183 E(o\214le)-.45 E F0 .017(or an)4.183 F
2.517(yo)-.15 G 2.517(ft)-2.517 G .018
(he personal initialization \214les)-2.517 F F2(~/.bash_pr)143.5 165.6 Q
(o\214le)-.45 E F0(,).18 E F2(~/.bash_lo)2.305 E(gin)-.1 E F0 2.805(,o)
.24 G(r)-2.805 E F2(~/.pr)2.305 E(o\214le)-.45 E F0 5.305(.B).18 G 2.805
(yd)-5.305 G(ef)-2.805 E(ault,)-.1 E F1(bash)2.805 E F0 .305
(reads these \214les when it is in)2.805 F -.2(vo)-.4 G -.1(ke).2 G
2.805(da).1 G(s)-2.805 E 2.5(al)144 177.6 S(ogin shell \(see)-2.5 E/F3 9
/Times-Bold@0 SF(INV)2.5 E(OCA)-.405 E(TION)-.855 E F0(belo)2.25 E(w\).)
-.25 E F1<adad6e6f72>108 194.4 Q(c)-.18 E F0 .161(Do not read and e)144
194.4 R -.15(xe)-.15 G .162(cute the personal initialization \214le).15
F F2(~/.bashr)2.162 E(c)-.37 E F0 .162(if the shell is interacti)2.972 F
-.15(ve)-.25 G 5.162(.T).15 G .162(his op-)-5.162 F(tion is on by def)
144 206.4 Q(ault if the shell is in)-.1 E -.2(vo)-.4 G -.1(ke).2 G 2.5
(da).1 G(s)-2.5 E F1(sh)2.5 E F0(.)A F1(\255\255posix)108 223.2 Q F0
1.783(Change the beha)144 235.2 R 1.782(vior of)-.2 F F1(bash)4.282 E F0
1.782(where the def)4.282 F 1.782(ault operation dif)-.1 F 1.782
(fers from the POSIX standard to)-.25 F .332(match the standard \()144
247.2 R F2 .332(posix mode)B F0 2.832(\). See)B F3 .333(SEE ALSO)2.833 F
F0(belo)2.583 E 2.833(wf)-.25 G .333
(or a reference to a document that details)-2.833 F(ho)144 259.2 Q 2.5
(wp)-.25 G(osix mode af)-2.5 E(fects bash')-.25 E 2.5(sb)-.55 G(eha)-2.5
E(vior)-.2 E(.)-.55 E F1<adad72>108 276 Q(estricted)-.18 E F0
(The shell becomes restricted \(see)144 288 Q F3(RESTRICTED SHELL)2.5 E
F0(belo)2.25 E(w\).)-.25 E F1<adad76>108 304.8 Q(erbose)-.1 E F0(Equi)
144 316.8 Q -.25(va)-.25 G(lent to).25 E F1<ad76>2.5 E F0(.)A F1<adad76>
108 333.6 Q(ersion)-.1 E F0(Sho)144 345.6 Q 2.5(wv)-.25 G
(ersion information for this instance of)-2.65 E F1(bash)2.5 E F0
(on the standard output and e)2.5 E(xit successfully)-.15 E(.)-.65 E/F4
10.95/Times-Bold@0 SF(ARGUMENTS)72 362.4 Q F0 .017(If ar)108 374.4 R
.016(guments remain after option processing, and neither the)-.18 F F1
<ad63>2.516 E F0 .016(nor the)2.516 F F1<ad73>2.516 E F0 .016
(option has been supplied, the \214rst)2.516 F(ar)108 386.4 Q .041(gume\
nt is assumed to be the name of a \214le containing shell commands.)-.18
F(If)5.041 E F1(bash)2.541 E F0 .041(is in)2.541 F -.2(vo)-.4 G -.1(ke)
.2 G 2.541(di).1 G 2.541(nt)-2.541 G .042(his f)-2.541 F(ashion,)-.1 E
F1($0)108 398.4 Q F0 .936(is set to the name of the \214le, and the pos\
itional parameters are set to the remaining ar)3.436 F(guments.)-.18 E
F1(Bash)5.935 E F0 .233(reads and e)108 410.4 R -.15(xe)-.15 G .233
(cutes commands from this \214le, then e).15 F(xits.)-.15 E F1(Bash)
5.234 E F0 1.334 -.55('s e)D .234(xit status is the e).4 F .234
(xit status of the last com-)-.15 F .349(mand e)108 422.4 R -.15(xe)-.15
G .349(cuted in the script.).15 F .349(If no commands are e)5.349 F -.15
(xe)-.15 G .349(cuted, the e).15 F .348(xit status is 0.)-.15 F .348
(An attempt is \214rst made to)5.348 F .253
(open the \214le in the current directory)108 434.4 R 2.753(,a)-.65 G
.254
(nd, if no \214le is found, then the shell searches the directories in)
-2.753 F F3 -.666(PA)2.754 G(TH)-.189 E F0(for the script.)108 446.4 Q
F4(INV)72 463.2 Q(OCA)-.493 E(TION)-1.04 E F0(A)108 475.2 Q F2(lo)2.5 E
(gin shell)-.1 E F0(is one whose \214rst character of ar)2.5 E
(gument zero is a)-.18 E F1<ad>2.5 E F0 2.5(,o)C 2.5(ro)-2.5 G
(ne started with the)-2.5 E F1(\255\255login)2.5 E F0(option.)2.5 E(An)
108 492 Q F2(inter)2.734 E(active)-.15 E F0 .234
(shell is one started without non-option ar)2.734 F .234
(guments \(unless)-.18 F F1<ad73>2.734 E F0 .233
(is speci\214ed\) and without the)2.734 F F1<ad63>2.733 E F0 .509(optio\
n whose standard input and error are both connected to terminals \(as d\
etermined by)108 504 R F2(isatty)3.019 E F0 .509(\(3\)\), or one).32 F
.946(started with the)108 516 R F1<ad69>3.445 E F0(option.)3.445 E F3
(PS1)5.945 E F0 .945(is set and)3.195 F F1<24ad>3.445 E F0(includes)
3.445 E F1(i)3.445 E F0(if)3.445 E F1(bash)3.445 E F0 .945(is interacti)
3.445 F -.15(ve)-.25 G 3.445(,a).15 G(llo)-3.445 E .945
(wing a shell script or a)-.25 F(startup \214le to test this state.)108
528 Q .032(The follo)108 544.8 R .032(wing paragraphs describe ho)-.25 F
(w)-.25 E F1(bash)2.532 E F0 -.15(exe)2.532 G .032
(cutes its startup \214les.).15 F .032(If an)5.032 F 2.532(yo)-.15 G
2.532(ft)-2.532 G .032(he \214les e)-2.532 F .033(xist b)-.15 F .033
(ut cannot be)-.2 F(read,)108 556.8 Q F1(bash)2.6 E F0 .1
(reports an error)2.6 F 5.1(.T)-.55 G .1(ildes are e)-5.45 F .099
(xpanded in \214lenames as described belo)-.15 F 2.599(wu)-.25 G(nder)
-2.599 E F1 -.18(Ti)2.599 G .099(lde Expansion).18 F F0(in)2.599 E(the)
108 568.8 Q F3(EXP)2.5 E(ANSION)-.666 E F0(section.)2.25 E(When)108
585.6 Q F1(bash)2.895 E F0 .395(is in)2.895 F -.2(vo)-.4 G -.1(ke).2 G
2.895(da).1 G 2.895(sa)-2.895 G 2.895(ni)-2.895 G(nteracti)-2.895 E .695
-.15(ve l)-.25 H .396(ogin shell, or as a non-interacti).15 F .696 -.15
(ve s)-.25 H .396(hell with the).15 F F1(\255\255login)2.896 E F0 .396
(option, it)2.896 F 1.334(\214rst reads and e)108 597.6 R -.15(xe)-.15 G
1.334(cutes commands from the \214le).15 F F2(/etc/pr)3.834 E(o\214le)
-.45 E F0 3.834(,i)C 3.833(ft)-3.834 G 1.333(hat \214le e)-3.833 F 3.833
(xists. After)-.15 F 1.333(reading that \214le, it)3.833 F .248
(looks for)108 609.6 R F2(~/.bash_pr)2.748 E(o\214le)-.45 E F0(,)A F2
(~/.bash_lo)2.748 E(gin)-.1 E F0 2.748(,a)C(nd)-2.748 E F2(~/.pr)2.748 E
(o\214le)-.45 E F0 2.748(,i)C 2.749(nt)-2.748 G .249(hat order)-2.749 F
2.749(,a)-.4 G .249(nd reads and e)-2.749 F -.15(xe)-.15 G .249
(cutes commands from).15 F .076(the \214rst one that e)108 621.6 R .076
(xists and is readable.)-.15 F(The)5.076 E F1(\255\255nopr)2.576 E
(o\214le)-.18 E F0 .076
(option may be used when the shell is started to in-)2.576 F
(hibit this beha)108 633.6 Q(vior)-.2 E(.)-.55 E 1.104
(When an interacti)108 650.4 R 1.404 -.15(ve l)-.25 H 1.104
(ogin shell e).15 F 1.104(xits, or a non-interacti)-.15 F 1.404 -.15
(ve l)-.25 H 1.104(ogin shell e).15 F -.15(xe)-.15 G 1.104(cutes the).15
F F1(exit)3.604 E F0 -.2(bu)3.604 G 1.104(iltin command,).2 F F1(bash)
108 662.4 Q F0(reads and e)2.5 E -.15(xe)-.15 G
(cutes commands from the \214le).15 E F2(~/.bash_lo)2.5 E(gout)-.1 E F0
2.5(,i)C 2.5(fi)-2.5 G 2.5(te)-2.5 G(xists.)-2.65 E 1.698
(When an interacti)108 679.2 R 1.998 -.15(ve s)-.25 H 1.698
(hell that is not a login shell is started,).15 F F1(bash)4.197 E F0
1.697(reads and e)4.197 F -.15(xe)-.15 G 1.697(cutes commands from).15 F
F2(~/.bashr)108 691.2 Q(c)-.37 E F0 2.535(,i)C 2.535(ft)-2.535 G .035
(hat \214le e)-2.535 F 2.535(xists. This)-.15 F .036
(may be inhibited by using the)2.535 F F1<adad6e6f72>2.536 E(c)-.18 E F0
2.536(option. The)2.536 F F1<adad72>2.536 E(c\214le)-.18 E F2(\214le)
2.536 E F0 .036(option will)2.536 F(force)108 703.2 Q F1(bash)2.5 E F0
(to read and e)2.5 E -.15(xe)-.15 G(cute commands from).15 E F2(\214le)
2.5 E F0(instead of)2.5 E F2(~/.bashr)2.5 E(c)-.37 E F0(.)A(When)108 720
Q F1(bash)5.306 E F0 2.806(is started non-interacti)5.306 F -.15(ve)-.25
G(ly).15 E 5.306(,t)-.65 G 5.306(or)-5.306 G 2.806
(un a shell script, for e)-5.306 F 2.805(xample, it looks for the v)-.15
F(ariable)-.25 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(2)
195.395 E 0 Cg EP
%%Page: 3 3
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 9/Times-Bold@0
SF -.27(BA)108 84 S(SH_ENV).27 E F0 1.01(in the en)3.26 F 1.01
(vironment, e)-.4 F 1.01(xpands its v)-.15 F 1.01
(alue if it appears there, and uses the e)-.25 F 1.011(xpanded v)-.15 F
1.011(alue as the)-.25 F(name of a \214le to read and e)108 96 Q -.15
(xe)-.15 G(cute.).15 E/F2 10/Times-Bold@0 SF(Bash)5 E F0(beha)2.5 E -.15
(ve)-.2 G 2.5(sa).15 G 2.5(si)-2.5 G 2.5(ft)-2.5 G(he follo)-2.5 E
(wing command were e)-.25 E -.15(xe)-.15 G(cuted:).15 E/F3 10/Courier@0
SF(if [ \255n "$BASH_ENV" ]; then . "$BASH_ENV"; fi)144 114 Q F0 -.2(bu)
108 132 S 2.5(tt).2 G(he v)-2.5 E(alue of the)-.25 E F1 -.666(PA)2.5 G
(TH)-.189 E F0 -.25(va)2.25 G
(riable is not used to search for the \214lename.).25 E(If)108 148.8 Q
F2(bash)3.417 E F0 .917(is in)3.417 F -.2(vo)-.4 G -.1(ke).2 G 3.417(dw)
.1 G .917(ith the name)-3.417 F F2(sh)3.417 E F0 3.417(,i)C 3.417(tt)
-3.417 G .917(ries to mimic the startup beha)-3.417 F .917
(vior of historical v)-.2 F .917(ersions of)-.15 F F2(sh)3.417 E F0(as)
3.417 E .145
(closely as possible, while conforming to the POSIX standard as well.)
108 160.8 R .145(When in)5.145 F -.2(vo)-.4 G -.1(ke).2 G 2.645(da).1 G
2.645(sa)-2.645 G 2.645(ni)-2.645 G(nteracti)-2.645 E .445 -.15(ve l)
-.25 H(ogin).15 E 1.264(shell, or a non-interacti)108 172.8 R 1.564 -.15
(ve s)-.25 H 1.264(hell with the).15 F F2(\255\255login)3.764 E F0 1.264
(option, it \214rst attempts to read and e)3.764 F -.15(xe)-.15 G 1.263
(cute commands).15 F(from)108 184.8 Q/F4 10/Times-Italic@0 SF(/etc/pr)
4.173 E(o\214le)-.45 E F0(and)3.203 E F4(~/.pr)2.523 E(o\214le)-.45 E F0
3.023(,i).18 G 3.024(nt)-3.023 G .524(hat order)-3.024 F 5.524(.T)-.55 G
(he)-5.524 E F2(\255\255nopr)3.024 E(o\214le)-.18 E F0 .524
(option may be used to inhibit this beha)3.024 F(vior)-.2 E(.)-.55 E
.418(When in)108 196.8 R -.2(vo)-.4 G -.1(ke).2 G 2.918(da).1 G 2.918
(sa)-2.918 G 2.918(ni)-2.918 G(nteracti)-2.918 E .718 -.15(ve s)-.25 H
.418(hell with the name).15 F F2(sh)2.918 E F0(,)A F2(bash)2.918 E F0
.418(looks for the v)2.918 F(ariable)-.25 E F1(ENV)2.918 E/F5 9
/Times-Roman@0 SF(,)A F0 -.15(ex)2.667 G .417(pands its v).15 F(alue)
-.25 E .171(if it is de\214ned, and uses the e)108 208.8 R .171
(xpanded v)-.15 F .171(alue as the name of a \214le to read and e)-.25 F
-.15(xe)-.15 G 2.671(cute. Since).15 F 2.671(as)2.671 G .171(hell in)
-2.671 F -.2(vo)-.4 G -.1(ke).2 G(d).1 E(as)108 220.8 Q F2(sh)3.081 E F0
.581(does not attempt to read and e)3.081 F -.15(xe)-.15 G .581
(cute commands from an).15 F 3.08(yo)-.15 G .58
(ther startup \214les, the)-3.08 F F2<adad72>3.08 E(c\214le)-.18 E F0
.58(option has)3.08 F .182(no ef)108 232.8 R 2.682(fect. A)-.25 F
(non-interacti)2.682 E .482 -.15(ve s)-.25 H .182(hell in).15 F -.2(vo)
-.4 G -.1(ke).2 G 2.682(dw).1 G .182(ith the name)-2.682 F F2(sh)2.682 E
F0 .182(does not attempt to read an)2.682 F 2.683(yo)-.15 G .183
(ther startup \214les.)-2.683 F(When in)108 244.8 Q -.2(vo)-.4 G -.1(ke)
.2 G 2.5(da).1 G(s)-2.5 E F2(sh)2.5 E F0(,)A F2(bash)2.5 E F0(enters)2.5
E F4(posix)3.75 E F0(mode after the startup \214les are read.)3.03 E
(When)108 261.6 Q F2(bash)2.727 E F0 .226(is started in)2.727 F F4
(posix)3.976 E F0 .226(mode, as with the)3.256 F F2(\255\255posix)2.726
E F0 .226(command line option, it follo)2.726 F .226(ws the POSIX stan-)
-.25 F .341(dard for startup \214les.)108 273.6 R .341
(In this mode, interacti)5.341 F .641 -.15(ve s)-.25 H .341(hells e).15
F .341(xpand the)-.15 F F1(ENV)2.841 E F0 -.25(va)2.591 G .342
(riable and commands are read and).25 F -.15(exe)108 285.6 S
(cuted from the \214le whose name is the e).15 E(xpanded v)-.15 E 2.5
(alue. No)-.25 F(other startup \214les are read.)2.5 E F2(Bash)108 302.4
Q F0 .224(attempts to determine when it is being run with its standard \
input connected to a netw)2.724 F .223(ork connection,)-.1 F .025
(as when e)108 314.4 R -.15(xe)-.15 G .025
(cuted by the remote shell daemon, usually).15 F F4 -.1(rs)2.525 G(hd).1
E F0 2.525(,o)C 2.525(rt)-2.525 G .025(he secure shell daemon)-2.525 F
F4(sshd)2.525 E F0 5.025(.I)C(f)-5.025 E F2(bash)2.525 E F0(deter)2.525
E(-)-.2 E .134(mines it is being run in this f)108 326.4 R .134
(ashion, it reads and e)-.1 F -.15(xe)-.15 G .133(cutes commands from)
.15 F F4(~/.bashr)2.633 E(c)-.37 E F0 2.633(,i)C 2.633(ft)-2.633 G .133
(hat \214le e)-2.633 F .133(xists and is)-.15 F 2.869(readable. It)108
338.4 R .369(will not do this if in)2.869 F -.2(vo)-.4 G -.1(ke).2 G
2.869(da).1 G(s)-2.869 E F2(sh)2.869 E F0 5.369(.T)C(he)-5.369 E F2
<adad6e6f72>2.869 E(c)-.18 E F0 .369
(option may be used to inhibit this beha)2.869 F(vior)-.2 E 2.869(,a)-.4
G(nd)-2.869 E(the)108 350.4 Q F2<adad72>2.919 E(c\214le)-.18 E F0 .419
(option may be used to force another \214le to be read, b)2.919 F .419
(ut neither)-.2 F F4 -.1(rs)2.919 G(hd).1 E F0(nor)2.919 E F4(sshd)2.919
E F0 .418(generally in)2.919 F -.2(vo)-.4 G -.1(ke).2 G
(the shell with those options or allo)108 362.4 Q 2.5(wt)-.25 G
(hem to be speci\214ed.)-2.5 E .433(If the shell is started with the ef)
108 379.2 R(fecti)-.25 E .733 -.15(ve u)-.25 H .433
(ser \(group\) id not equal to the real user \(group\) id, and the).15 F
F2<ad70>2.934 E F0(op-)2.934 E 1.124(tion is not supplied, no startup \
\214les are read, shell functions are not inherited from the en)108
391.2 R 1.124(vironment, the)-.4 F F1(SHELLOPTS)108 403.2 Q F5(,)A F1
-.27(BA)2.959 G(SHOPTS).27 E F5(,)A F1(CDP)2.959 E -.855(AT)-.666 G(H)
.855 E F5(,)A F0(and)2.959 E F1(GLOBIGNORE)3.209 E F0 -.25(va)2.959 G
.709(riables, if the).25 F 3.209(ya)-.15 G .71(ppear in the en)-3.209 F
.71(vironment, are)-.4 F .905(ignored, and the ef)108 415.2 R(fecti)-.25
E 1.205 -.15(ve u)-.25 H .904(ser id is set to the real user id.).15 F
.904(If the)5.904 F F2<ad70>3.404 E F0 .904(option is supplied at in)
3.404 F -.2(vo)-.4 G .904(cation, the).2 F(startup beha)108 427.2 Q
(vior is the same, b)-.2 E(ut the ef)-.2 E(fecti)-.25 E .3 -.15(ve u)
-.25 H(ser id is not reset.).15 E/F6 10.95/Times-Bold@0 SF(DEFINITIONS)
72 444 Q F0(The follo)108 456 Q
(wing de\214nitions are used throughout the rest of this document.)-.25
E F2(blank)108 468 Q F0 2.5(As)144 468 S(pace or tab)-2.5 E(.)-.4 E F2
-.1(wo)108 480 S(rd).1 E F0 2.5(As)144 480 S
(equence of characters considered as a single unit by the shell.)-2.5 E
(Also kno)5 E(wn as a)-.25 E F2(tok)2.5 E(en)-.1 E F0(.)A F2(name)108
492 Q F0(A)144 492 Q F4(wor)3.005 E(d)-.37 E F0 .165
(consisting only of alphanumeric characters and underscores, and be)
3.435 F .166(ginning with an alpha-)-.15 F
(betic character or an underscore.)144 504 Q(Also referred to as an)5 E
F2(identi\214er)2.5 E F0(.)A F2(metacharacter)108 516 Q F0 2.5(Ac)144
528 S(haracter that, when unquoted, separates w)-2.5 E 2.5(ords. One)-.1
F(of the follo)2.5 E(wing:)-.25 E F2 5(|&;\(\)<>s)144 540 S 2.5
(pace tab newline)-5 F(contr)108 552 Q(ol operator)-.18 E F0(A)144 564 Q
F4(tok)2.5 E(en)-.1 E F0(that performs a control function.)2.5 E
(It is one of the follo)5 E(wing symbols:)-.25 E F2 2.5
(|| & && ; ;; ;& ;;& \( \) | |&)144 576 R(<newline>)10 E F6(RESER)72
592.8 Q(VED W)-.602 E(ORDS)-.11 E F4 .307(Reserved wor)108 604.8 R(ds)
-.37 E F0 .307(are w)2.807 F .307(ords that ha)-.1 F .607 -.15(ve a s)
-.2 H .306(pecial meaning to the shell.).15 F .306(The follo)5.306 F
.306(wing w)-.25 F .306(ords are recognized as)-.1 F(reserv)108 616.8 Q
.313(ed when unquoted and either the \214rst w)-.15 F .314
(ord of a command \(see)-.1 F F1 .314(SHELL GRAMMAR)2.814 F F0(belo)
2.564 E .314(w\), the third)-.25 F -.1(wo)108 628.8 S .644(rd of a).1 F
F2(case)3.144 E F0(or)3.144 E F2(select)3.143 E F0 .643(command \(only)
3.143 F F2(in)3.143 E F0 .643(is v)3.143 F .643(alid\), or the third w)
-.25 F .643(ord of a)-.1 F F2 -.25(fo)3.143 G(r).25 E F0 .643
(command \(only)3.143 F F2(in)3.143 E F0(and)3.143 E F2(do)3.143 E F0
(are v)108 640.8 Q(alid\):)-.25 E F2 11.295(!c)144 657.6 S 8.795
(ase copr)-11.295 F 8.795(oc do done elif else esac \214 f)-.18 F 8.795
(or function if in select then)-.25 F 7.5(until while { } time [[ ]])144
669.6 R F6(SHELL GRAMMAR)72 686.4 Q F2(Simple Commands)87 698.4 Q F0(A)
108 710.4 Q F4 .389(simple command)2.889 F F0 .389
(is a sequence of optional v)2.889 F .388(ariable assignments follo)-.25
F .388(wed by)-.25 F F2(blank)2.888 E F0 .388(-separated w)B .388
(ords and)-.1 F .815(redirections, and terminated by a)108 722.4 R F4
(contr)3.315 E .815(ol oper)-.45 F(ator)-.15 E F0 5.815(.T)C .815
(he \214rst w)-5.815 F .816(ord speci\214es the command to be e)-.1 F
-.15(xe)-.15 G(cuted,).15 E(GNU Bash 5.1)72 768 Q(2020 October 29)
141.235 E(3)195.395 E 0 Cg EP
%%Page: 4 4
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E
(and is passed as ar)108 84 Q(gument zero.)-.18 E(The remaining w)5 E
(ords are passed as ar)-.1 E(guments to the in)-.18 E -.2(vo)-.4 G -.1
(ke).2 G 2.5(dc).1 G(ommand.)-2.5 E(The return v)108 100.8 Q(alue of a)
-.25 E/F1 10/Times-Italic@0 SF(simple command)2.5 E F0(is its e)2.5 E
(xit status, or 128+)-.15 E F1(n)A F0
(if the command is terminated by signal)3.333 E F1(n)2.86 E F0(.).24 E
/F2 10/Times-Bold@0 SF(Pipelines)87 117.6 Q F0(A)108 129.6 Q F1
(pipeline)2.996 E F0 .496(is a sequence of one or more commands separat\
ed by one of the control operators)2.996 F F2(|)2.996 E F0(or)2.996 E F2
(|&)2.996 E F0 5.496(.T)C(he)-5.496 E(format for a pipeline is:)108
141.6 Q([)144 158.4 Q F2(time)A F0([)2.5 E F2<ad70>A F0(]] [ ! ])A F1
(command)2.5 E F0 2.5([[)2.5 G F2(|)-2.5 E/F3 10/Symbol SF<ef>A F2(|&)A
F0(])A F1(command2)2.5 E F0(... ])2.5 E .231(The standard output of)108
175.2 R F1(command)2.931 E F0 .232
(is connected via a pipe to the standard input of)3.502 F F1(command2)
2.932 E F0 5.232(.T).02 G .232(his connec-)-5.232 F .643
(tion is performed before an)108 187.2 R 3.143(yr)-.15 G .642
(edirections speci\214ed by the command \(see)-3.143 F/F4 9/Times-Bold@0
SF(REDIRECTION)3.142 E F0(belo)2.892 E 3.142(w\). If)-.25 F F2(|&)3.142
E F0(is)3.142 E(used,)108 199.2 Q F1(command)2.663 E F0 1.263 -.55('s s)
D .163(tandard error).55 F 2.663(,i)-.4 G 2.663(na)-2.663 G .163
(ddition to its standard output, is connected to)-2.663 F F1(command2)
2.664 E F0 1.264 -.55('s s)D .164(tandard in-).55 F .438
(put through the pipe; it is shorthand for)108 211.2 R F2 .437(2>&1 |)
2.937 F F0 5.437(.T)C .437
(his implicit redirection of the standard error to the stan-)-5.437 F
(dard output is performed after an)108 223.2 Q 2.5(yr)-.15 G
(edirections speci\214ed by the command.)-2.5 E .48
(The return status of a pipeline is the e)108 240 R .48
(xit status of the last command, unless the)-.15 F F2(pipefail)2.98 E F0
.48(option is enabled.)2.98 F(If)108 252 Q F2(pipefail)2.687 E F0 .187
(is enabled, the pipeline')2.687 F 2.687(sr)-.55 G .186
(eturn status is the v)-2.687 F .186
(alue of the last \(rightmost\) command to e)-.25 F .186(xit with a)-.15
F .61(non-zero status, or zero if all commands e)108 264 R .611
(xit successfully)-.15 F 5.611(.I)-.65 G 3.111(ft)-5.611 G .611
(he reserv)-3.111 F .611(ed w)-.15 F(ord)-.1 E F2(!)3.111 E F0 .611
(precedes a pipeline, the)5.611 F -.15(ex)108 276 S .55
(it status of that pipeline is the logical ne).15 F -.05(ga)-.15 G .55
(tion of the e).05 F .55(xit status as described abo)-.15 F -.15(ve)-.15
G 5.55(.T).15 G .55(he shell w)-5.55 F .55(aits for)-.1 F
(all commands in the pipeline to terminate before returning a v)108 288
Q(alue.)-.25 E .298(If the)108 304.8 R F2(time)2.799 E F0(reserv)2.799 E
.299(ed w)-.15 F .299(ord precedes a pipeline, the elapsed as well as u\
ser and system time consumed by its)-.1 F -.15(exe)108 316.8 S .14
(cution are reported when the pipeline terminates.).15 F(The)5.139 E F2
<ad70>2.639 E F0 .139(option changes the output format to that spec-)
2.639 F .302(i\214ed by POSIX.)108 328.8 R .303(When the shell is in)
5.302 F F1 .303(posix mode)2.803 F F0 2.803(,i)C 2.803(td)-2.803 G .303
(oes not recognize)-2.803 F F2(time)2.803 E F0 .303(as a reserv)2.803 F
.303(ed w)-.15 F .303(ord if the ne)-.1 F(xt)-.15 E(tok)108 340.8 Q .736
(en be)-.1 F .736(gins with a `-'.)-.15 F(The)5.736 E F4(TIMEFORMA)3.236
E(T)-.855 E F0 -.25(va)2.986 G .736
(riable may be set to a format string that speci\214es ho).25 F 3.235
(wt)-.25 G(he)-3.235 E .879
(timing information should be displayed; see the description of)108
352.8 R F4(TIMEFORMA)3.38 E(T)-.855 E F0(under)3.13 E F2 .88(Shell V)
3.38 F(ariables)-.92 E F0(be-)3.38 E(lo)108 364.8 Q -.65(w.)-.25 G .162
(When the shell is in)108 381.6 R F1 .162(posix mode)2.662 F F0(,)A F2
(time)2.662 E F0 .162(may be follo)2.662 F .161(wed by a ne)-.25 F 2.661
(wline. In)-.25 F .161(this case, the shell displays the to-)2.661 F
.243(tal user and system time consumed by the shell and its children.)
108 393.6 R(The)5.243 E F4(TIMEFORMA)2.743 E(T)-.855 E F0 -.25(va)2.493
G .243(riable may be used).25 F
(to specify the format of the time information.)108 405.6 Q .656
(Each command in a pipeline is e)108 422.4 R -.15(xe)-.15 G .655
(cuted as a separate process \(i.e., in a subshell\).).15 F(See)5.655 E
F4 .655(COMMAND EXE-)3.155 F .05(CUTION ENVIR)108 434.4 R(ONMENT)-.27 E
F0 .051(for a description of a subshell en)2.3 F 2.551(vironment. If)-.4
F(the)2.551 E F2(lastpipe)2.551 E F0 .051(option is enabled us-)2.551 F
.416(ing the)108 446.4 R F2(shopt)2.916 E F0 -.2(bu)2.916 G .416
(iltin \(see the description of).2 F F2(shopt)2.916 E F0(belo)2.916 E
.416(w\), the last element of a pipeline may be run by the)-.25 F
(shell process.)108 458.4 Q F2(Lists)87 475.2 Q F0(A)108 487.2 Q F1
(list)2.849 E F0 .349(is a sequence of one or more pipelines separated \
by one of the operators)2.849 F F2(;)2.85 E F0(,)A F2(&)2.85 E F0(,)A F2
(&&)2.85 E F0 2.85(,o)C(r)-2.85 E F2(||)2.85 E F0 2.85(,a)C .35
(nd option-)-2.85 F(ally terminated by one of)108 499.2 Q F2(;)2.5 E F0
(,)A F2(&)2.5 E F0 2.5(,o)C(r)-2.5 E F2(<newline>)2.5 E F0(.)A .961
(Of these list operators,)108 516 R F2(&&)3.461 E F0(and)3.461 E F2(||)
3.461 E F0(ha)3.461 E 1.261 -.15(ve e)-.2 H .961(qual precedence, follo)
.15 F .96(wed by)-.25 F F2(;)3.46 E F0(and)3.46 E F2(&)3.46 E F0 3.46
(,w)C .96(hich ha)-3.46 F 1.26 -.15(ve e)-.2 H .96(qual prece-).15 F
(dence.)108 528 Q 2.5(As)108 544.8 S(equence of one or more ne)-2.5 E
(wlines may appear in a)-.25 E F1(list)2.5 E F0
(instead of a semicolon to delimit commands.)2.5 E .029
(If a command is terminated by the control operator)108 561.6 R F2(&)
2.529 E F0 2.529(,t)C .029(he shell e)-2.529 F -.15(xe)-.15 G .029
(cutes the command in the).15 F F1(bac)2.529 E(kgr)-.2 E(ound)-.45 E F0
(in)2.529 E 2.678(as)108 573.6 S 2.678(ubshell. The)-2.678 F .178
(shell does not w)2.678 F .178
(ait for the command to \214nish, and the return status is 0.)-.1 F .178
(These are referred)5.178 F .778(to as)108 585.6 R F1(async)3.278 E(hr)
-.15 E(onous)-.45 E F0 3.278(commands. Commands)3.278 F .779
(separated by a)3.278 F F2(;)3.279 E F0 .779(are e)3.279 F -.15(xe)-.15
G .779(cuted sequentially; the shell w).15 F .779(aits for)-.1 F
(each command to terminate in turn.)108 597.6 Q
(The return status is the e)5 E(xit status of the last command e)-.15 E
-.15(xe)-.15 G(cuted.).15 E .172(AND and OR lists are sequences of one \
or more pipelines separated by the)108 614.4 R F2(&&)2.671 E F0(and)
2.671 E F2(||)2.671 E F0 .171(control operators, re-)2.671 F(specti)108
626.4 Q -.15(ve)-.25 G(ly).15 E 5(.A)-.65 G(ND and OR lists are e)-5 E
-.15(xe)-.15 G(cuted with left associati).15 E(vity)-.25 E 5(.A)-.65 G
2.5(nA)-5 G(ND list has the form)-2.5 E F1(command1)144 643.2 Q F2(&&)
2.5 E F1(command2)2.5 E(command2)108.2 660 Q F0(is e)2.52 E -.15(xe)-.15
G(cuted if, and only if,).15 E F1(command1)2.7 E F0(returns an e)2.5 E
(xit status of zero \(success\).)-.15 E(An OR list has the form)108
676.8 Q F1(command1)144 693.6 Q F2(||)2.5 E F1(command2)2.5 E(command2)
108.2 710.4 Q F0 .434(is e)2.954 F -.15(xe)-.15 G .434
(cuted if, and only if,).15 F F1(command1)3.135 E F0 .435
(returns a non-zero e)2.935 F .435(xit status.)-.15 F .435
(The return status of AND)5.435 F(and OR lists is the e)108 722.4 Q
(xit status of the last command e)-.15 E -.15(xe)-.15 G
(cuted in the list.).15 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235
E(4)195.395 E 0 Cg EP
%%Page: 5 5
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(Compound Commands)87 84 Q F0(A)108 96 Q/F2 10/Times-Italic@0 SF 1.054
(compound command)3.554 F F0 1.054(is one of the follo)3.554 F 3.553
(wing. In)-.25 F 1.053(most cases a)3.553 F F2(list)3.553 E F0 1.053
(in a command')3.553 F 3.553(sd)-.55 G 1.053(escription may be)-3.553 F
1.026(separated from the rest of the command by one or more ne)108 108 R
1.026(wlines, and may be follo)-.25 F 1.027(wed by a ne)-.25 F 1.027
(wline in)-.25 F(place of a semicolon.)108 120 Q(\()108 136.8 Q F2(list)
A F0(\))A F2(list)144 136.8 Q F0 .011(is e)2.512 F -.15(xe)-.15 G .011
(cuted in a subshell en).15 F .011(vironment \(see)-.4 F/F3 9
/Times-Bold@0 SF .011(COMMAND EXECUTION ENVIR)2.511 F(ONMENT)-.27 E F0
(belo)2.261 E(w\).)-.25 E -1.11(Va)144 148.8 S .016
(riable assignments and b)1.11 F .016(uiltin commands that af)-.2 F .016
(fect the shell')-.25 F 2.517(se)-.55 G -.4(nv)-2.517 G .017
(ironment do not remain in ef-).4 F(fect after the command completes.)
144 160.8 Q(The return status is the e)5 E(xit status of)-.15 E F2(list)
2.5 E F0(.)A({)108 177.6 Q F2(list)2.5 E F0 2.5(;})C F2(list)144 177.6 Q
F0 .402(is simply e)2.902 F -.15(xe)-.15 G .401
(cuted in the current shell en).15 F(vironment.)-.4 E F2(list)5.401 E F0
.401(must be terminated with a ne)2.901 F .401(wline or)-.25 F 3.214
(semicolon. This)144 189.6 R .714(is kno)3.214 F .714(wn as a)-.25 F F2
(gr)3.215 E .715(oup command)-.45 F F0 5.715(.T)C .715
(he return status is the e)-5.715 F .715(xit status of)-.15 F F2(list)
3.215 E F0 5.715(.N)C(ote)-5.715 E .22(that unlik)144 201.6 R 2.72(et)
-.1 G .22(he metacharacters)-2.72 F F1(\()2.72 E F0(and)2.72 E F1(\))
2.72 E F0(,)A F1({)2.72 E F0(and)2.72 E F1(})2.719 E F0(are)2.719 E F2
-.37(re)2.719 G .219(served wor).37 F(ds)-.37 E F0 .219
(and must occur where a reserv)2.719 F(ed)-.15 E -.1(wo)144 213.6 S .256
(rd is permitted to be recognized.).1 F .256(Since the)5.256 F 2.756(yd)
-.15 G 2.756(on)-2.756 G .257(ot cause a w)-2.756 F .257(ord break, the)
-.1 F 2.757(ym)-.15 G .257(ust be separated)-2.757 F(from)144 225.6 Q F2
(list)2.5 E F0(by whitespace or another shell metacharacter)2.5 E(.)-.55
E(\(\()108 242.4 Q F2 -.2(ex)C(pr).2 E(ession)-.37 E F0(\)\))A(The)144
254.4 Q F2 -.2(ex)2.552 G(pr).2 E(ession)-.37 E F0 .052(is e)2.552 F
-.25(va)-.25 G .051(luated according to the rules described belo).25 F
2.551(wu)-.25 G(nder)-2.551 E F3 .051(ARITHMETIC EV)2.551 F(ALU)-1.215 E
(A-)-.54 E(TION)144 266.4 Q/F4 9/Times-Roman@0 SF(.)A F0 .411(If the v)
4.91 F .411(alue of the e)-.25 F .411(xpression is non-zero, the return\
 status is 0; otherwise the return status)-.15 F(is 1.)144 278.4 Q
(This is e)5 E(xactly equi)-.15 E -.25(va)-.25 G(lent to).25 E F1(let ")
2.5 E F2 -.2(ex)C(pr).2 E(ession)-.37 E F1(")A F0(.)A F1([[)108 295.2 Q
F2 -.2(ex)2.5 G(pr).2 E(ession)-.37 E F1(]])2.5 E F0 .003
(Return a status of 0 or 1 depending on the e)144 307.2 R -.25(va)-.25 G
.003(luation of the conditional e).25 F(xpression)-.15 E F2 -.2(ex)2.503
G(pr).2 E(ession)-.37 E F0 5.003(.E)C(x-)-5.003 E .758
(pressions are composed of the primaries described belo)144 319.2 R
3.259(wu)-.25 G(nder)-3.259 E F3(CONDITION)3.259 E .759(AL EXPRESSIONS)
-.18 F F4(.)A F0 -.8(Wo)144 331.2 S .029(rd splitting and pathname e).8
F .029(xpansion are not performed on the w)-.15 F .029(ords between the)
-.1 F F1([[)2.528 E F0(and)2.528 E F1(]])2.528 E F0 2.528(;t)C(ilde)
-2.528 E -.15(ex)144 343.2 S 3.968(pansion, parameter and v).15 F 3.969
(ariable e)-.25 F 3.969(xpansion, arithmetic e)-.15 F 3.969
(xpansion, command substitution,)-.15 F .571
(process substitution, and quote remo)144 355.2 R -.25(va)-.15 G 3.071
(la).25 G .571(re performed.)-3.071 F .571
(Conditional operators such as)5.571 F F1<ad66>3.07 E F0 .57(must be)
3.07 F(unquoted to be recognized as primaries.)144 367.2 Q
(When used with)144 385.2 Q F1([[)2.5 E F0 2.5(,t)C(he)-2.5 E F1(<)2.5 E
F0(and)2.5 E F1(>)2.5 E F0(operators sort le)2.5 E
(xicographically using the current locale.)-.15 E .502(When the)144
403.2 R F1(==)3.002 E F0(and)3.002 E F1(!=)3.002 E F0 .502(operators ar\
e used, the string to the right of the operator is considered a pat-)
3.002 F .81(tern and matched according to the rules described belo)144
415.2 R 3.31(wu)-.25 G(nder)-3.31 E F1 -.1(Pa)3.31 G(tter).1 E 3.31(nM)
-.15 G(atching)-3.31 E F0 3.31(,a)C 3.31(si)-3.31 G 3.31(ft)-3.31 G(he)
-3.31 E F1(ext-)3.31 E(glob)144 427.2 Q F0 .313
(shell option were enabled.)2.813 F(The)5.313 E F1(=)2.813 E F0 .313
(operator is equi)2.813 F -.25(va)-.25 G .313(lent to).25 F F1(==)2.813
E F0 5.313(.I)C 2.813(ft)-5.313 G(he)-2.813 E F1(nocasematch)2.813 E F0
.314(shell op-)2.814 F .03
(tion is enabled, the match is performed without re)144 439.2 R -.05(ga)
-.15 G .029(rd to the case of alphabetic characters.).05 F .029(The re-)
5.029 F .258(turn v)144 451.2 R .259(alue is 0 if the string matches \()
-.25 F F1(==)A F0 2.759(\)o)C 2.759(rd)-2.759 G .259(oes not match \()
-2.759 F F1(!=)A F0 2.759(\)t)C .259(he pattern, and 1 otherwise.)-2.759
F(An)5.259 E(y)-.15 E(part of the pattern may be quoted to force the qu\
oted portion to be matched as a string.)144 463.2 Q .243
(An additional binary operator)144 481.2 R(,)-.4 E F1(=~)2.743 E F0
2.743(,i)C 2.743(sa)-2.743 G -.25(va)-2.943 G .243
(ilable, with the same precedence as).25 F F1(==)2.743 E F0(and)2.743 E
F1(!=)2.743 E F0 5.243(.W)C .243(hen it is)-5.243 F .182
(used, the string to the right of the operator is considered a POSIX e)
144 493.2 R .182(xtended re)-.15 F .182(gular e)-.15 F .182
(xpression and)-.15 F 2.624(matched accordingly \(using the POSIX)144
505.2 R F2 -.37(re)5.124 G(gcomp)-.03 E F0(and)5.124 E F2 -.37(re)5.124
G -.1(ge)-.03 G(xec)-.1 E F0(interf)5.123 E 2.623
(aces usually described in)-.1 F F2 -.37(re)144 517.2 S -.1(ge)-.03 G(x)
-.1 E F0 3.271(\(3\)\). The)B .771(return v)3.271 F .772
(alue is 0 if the string matches the pattern, and 1 otherwise.)-.25 F
.772(If the re)5.772 F(gular)-.15 E -.15(ex)144 529.2 S .509
(pression is syntactically incorrect, the conditional e).15 F
(xpression')-.15 E 3.008(sr)-.55 G .508(eturn v)-3.008 F .508
(alue is 2.)-.25 F .508(If the)5.508 F F1(nocase-)3.008 E(match)144
541.2 Q F0 1.307
(shell option is enabled, the match is performed without re)3.806 F -.05
(ga)-.15 G 1.307(rd to the case of alphabetic).05 F 3.063
(characters. An)144 553.2 R 3.063(yp)-.15 G .563(art of the pattern may\
 be quoted to force the quoted portion to be matched as a)-3.063 F 2.943
(string. Brack)144 565.2 R .443(et e)-.1 F .443(xpressions in re)-.15 F
.443(gular e)-.15 F .443(xpressions must be treated carefully)-.15 F
2.944(,s)-.65 G .444(ince normal quoting)-2.944 F .615
(characters lose their meanings between brack)144 577.2 R 3.115(ets. If)
-.1 F .614(the pattern is stored in a shell v)3.115 F .614
(ariable, quot-)-.25 F(ing the v)144 589.2 Q(ariable e)-.25 E
(xpansion forces the entire pattern to be matched as a string.)-.15 E
.838(The pattern will match if it matches an)144 607.2 R 3.338(yp)-.15 G
.838(art of the string.)-3.338 F .839(Anchor the pattern using the)5.839
F F1(^)3.339 E F0(and)3.339 E F1($)3.339 E F0(re)144 619.2 Q .847
(gular e)-.15 F .846
(xpression operators to force it to match the entire string.)-.15 F .846
(The array v)5.846 F(ariable)-.25 E F3 -.27(BA)3.346 G(SH_RE-).27 E(MA)
144 631.2 Q(TCH)-.855 E F0 .321
(records which parts of the string matched the pattern.)2.571 F .322
(The element of)5.322 F F3 -.27(BA)2.822 G(SH_REMA).27 E(TCH)-.855 E F0
.583(with inde)144 643.2 R 3.083(x0)-.15 G .582
(contains the portion of the string matching the entire re)-.001 F .582
(gular e)-.15 F 3.082(xpression. Substrings)-.15 F .249
(matched by parenthesized sube)144 655.2 R .249
(xpressions within the re)-.15 F .249(gular e)-.15 F .249
(xpression are sa)-.15 F -.15(ve)-.2 G 2.749(di).15 G 2.75(nt)-2.749 G
.25(he remaining)-2.75 F F3 -.27(BA)144 667.2 S(SH_REMA).27 E(TCH)-.855
E F0 1.13(indices. The element of)3.38 F F3 -.27(BA)3.63 G(SH_REMA).27 E
(TCH)-.855 E F0 1.13(with inde)3.38 F(x)-.15 E F2(n)3.63 E F0 1.13
(is the portion of the)3.63 F(string matching the)144 679.2 Q F2(n)2.5 E
F0(th parenthesized sube)A(xpression.)-.15 E .785
(Expressions may be combined using the follo)144 697.2 R .786
(wing operators, listed in decreasing order of prece-)-.25 F(dence:)144
709.2 Q(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(5)195.395 E 0 Cg
EP
%%Page: 6 6
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(\()144 84 Q/F2 10/Times-Italic@0 SF -.2(ex)2.5 G(pr).2 E(ession)-.37
E F1(\))2.5 E F0 .523(Returns the v)180 96 R .522(alue of)-.25 F F2 -.2
(ex)3.022 G(pr).2 E(ession)-.37 E F0 5.522(.T)C .522
(his may be used to o)-5.522 F -.15(ve)-.15 G .522
(rride the normal precedence of).15 F(operators.)180 108 Q F1(!)144 120
Q F2 -.2(ex)2.5 G(pr).2 E(ession)-.37 E F0 -.35(Tr)180 132 S(ue if).35 E
F2 -.2(ex)2.5 G(pr).2 E(ession)-.37 E F0(is f)2.74 E(alse.)-.1 E F2 -.2
(ex)144 144 S(pr).2 E(ession1)-.37 E F1(&&)2.5 E F2 -.2(ex)2.5 G(pr).2 E
(ession2)-.37 E F0 -.35(Tr)180 156 S(ue if both).35 E F2 -.2(ex)2.5 G
(pr).2 E(ession1)-.37 E F0(and)2.5 E F2 -.2(ex)2.5 G(pr).2 E(ession2)
-.37 E F0(are true.)2.52 E F2 -.2(ex)144 168 S(pr).2 E(ession1)-.37 E F1
(||)2.5 E F2 -.2(ex)2.5 G(pr).2 E(ession2)-.37 E F0 -.35(Tr)180 180 S
(ue if either).35 E F2 -.2(ex)2.5 G(pr).2 E(ession1)-.37 E F0(or)2.5 E
F2 -.2(ex)2.5 G(pr).2 E(ession2)-.37 E F0(is true.)2.52 E(The)144 196.8
Q F1(&&)2.675 E F0(and)2.675 E F1(||)2.675 E F0 .175(operators do not e)
2.675 F -.25(va)-.25 G(luate).25 E F2 -.2(ex)2.675 G(pr).2 E(ession2)
-.37 E F0 .175(if the v)2.675 F .175(alue of)-.25 F F2 -.2(ex)2.676 G
(pr).2 E(ession1)-.37 E F0 .176(is suf)2.676 F .176(\214cient to de-)
-.25 F(termine the return v)144 208.8 Q
(alue of the entire conditional e)-.25 E(xpression.)-.15 E F1 -.25(fo)
108 225.6 S(r).25 E F2(name)2.5 E F0 2.5([[)2.5 G F1(in)A F0([)2.5 E F2
(wor)2.5 E 2.5(d.)-.37 G(..)-2.5 E F0 2.5(]];])2.5 G F1(do)A F2(list)2.5
E F0(;)2.5 E F1(done)2.5 E F0 .424(The list of w)144 237.6 R .424
(ords follo)-.1 F(wing)-.25 E F1(in)2.924 E F0 .423(is e)2.924 F .423
(xpanded, generating a list of items.)-.15 F .423(The v)5.423 F(ariable)
-.25 E F2(name)2.923 E F0 .423(is set to)2.923 F .653
(each element of this list in turn, and)144 249.6 R F2(list)3.153 E F0
.653(is e)3.153 F -.15(xe)-.15 G .653(cuted each time.).15 F .653
(If the)5.653 F F1(in)3.153 E F2(wor)3.153 E(d)-.37 E F0 .653
(is omitted, the)3.153 F F1 -.25(fo)3.153 G(r).25 E F0 .649(command e)
144 261.6 R -.15(xe)-.15 G(cutes).15 E F2(list)3.149 E F0 .648
(once for each positional parameter that is set \(see)3.148 F/F3 9
/Times-Bold@0 SF -.666(PA)3.148 G(RAMETERS).666 E F0(belo)2.898 E(w\).)
-.25 E .153(The return status is the e)144 273.6 R .153
(xit status of the last command that e)-.15 F -.15(xe)-.15 G 2.654
(cutes. If).15 F .154(the e)2.654 F .154(xpansion of the items)-.15 F
(follo)144 285.6 Q(wing)-.25 E F1(in)2.5 E F0
(results in an empty list, no commands are e)2.5 E -.15(xe)-.15 G
(cuted, and the return status is 0.).15 E F1 -.25(fo)108 302.4 S(r).25 E
F0(\(\()2.5 E F2 -.2(ex)2.5 G(pr1).2 E F0(;)2.5 E F2 -.2(ex)2.5 G(pr2).2
E F0(;)2.5 E F2 -.2(ex)2.5 G(pr3).2 E F0(\)\) ;)2.5 E F1(do)2.5 E F2
(list)2.5 E F0(;)2.5 E F1(done)2.5 E F0 1.236(First, the arithmetic e)
144 314.4 R(xpression)-.15 E F2 -.2(ex)3.736 G(pr1).2 E F0 1.235(is e)
3.736 F -.25(va)-.25 G 1.235
(luated according to the rules described belo).25 F 3.735(wu)-.25 G
(nder)-3.735 E F3 .561(ARITHMETIC EV)144 326.4 R(ALU)-1.215 E -.855(AT)
-.54 G(ION).855 E/F4 9/Times-Roman@0 SF(.)A F0 .561(The arithmetic e)
5.061 F(xpression)-.15 E F2 -.2(ex)3.061 G(pr2).2 E F0 .562(is then e)
3.062 F -.25(va)-.25 G .562(luated repeatedly until).25 F .592(it e)144
338.4 R -.25(va)-.25 G .592(luates to zero.).25 F .592(Each time)5.592 F
F2 -.2(ex)3.092 G(pr2).2 E F0 -.25(eva)3.092 G .592
(luates to a non-zero v).25 F(alue,)-.25 E F2(list)3.092 E F0 .591(is e)
3.092 F -.15(xe)-.15 G .591(cuted and the arith-).15 F .228(metic e)144
350.4 R(xpression)-.15 E F2 -.2(ex)2.728 G(pr3).2 E F0 .229(is e)2.728 F
-.25(va)-.25 G 2.729(luated. If).25 F(an)2.729 E 2.729(ye)-.15 G .229
(xpression is omitted, it beha)-2.879 F -.15(ve)-.2 G 2.729(sa).15 G
2.729(si)-2.729 G 2.729(fi)-2.729 G 2.729(te)-2.729 G -.25(va)-2.979 G
.229(luates to 1.).25 F .228(The return v)144 362.4 R .228
(alue is the e)-.25 F .228(xit status of the last command in)-.15 F F2
(list)2.728 E F0 .227(that is e)2.728 F -.15(xe)-.15 G .227(cuted, or f)
.15 F .227(alse if an)-.1 F 2.727(yo)-.15 G 2.727(ft)-2.727 G(he)-2.727
E -.15(ex)144 374.4 S(pressions is in).15 E -.25(va)-.4 G(lid.).25 E F1
(select)108 391.2 Q F2(name)2.5 E F0([)2.5 E F1(in)2.5 E F2(wor)2.5 E(d)
-.37 E F0 2.5(];)2.5 G F1(do)A F2(list)2.5 E F0(;)2.5 E F1(done)2.5 E F0
.432(The list of w)144 403.2 R .432(ords follo)-.1 F(wing)-.25 E F1(in)
2.932 E F0 .432(is e)2.932 F .432(xpanded, generating a list of items.)
-.15 F .433(The set of e)5.433 F .433(xpanded w)-.15 F(ords)-.1 E .843
(is printed on the standard error)144 415.2 R 3.342(,e)-.4 G .842
(ach preceded by a number)-3.342 F 5.842(.I)-.55 G 3.342(ft)-5.842 G(he)
-3.342 E F1(in)3.342 E F2(wor)3.342 E(d)-.37 E F0 .842
(is omitted, the posi-)3.342 F .201(tional parameters are printed \(see)
144 427.2 R F3 -.666(PA)2.701 G(RAMETERS).666 E F0(belo)2.451 E 2.701
(w\). The)-.25 F F3(PS3)2.701 E F0 .201(prompt is then displayed and a)
2.451 F .214(line read from the standard input.)144 439.2 R .213
(If the line consists of a number corresponding to one of the dis-)5.214
F 1.537(played w)144 451.2 R 1.537(ords, then the v)-.1 F 1.537(alue of)
-.25 F F2(name)4.397 E F0 1.537(is set to that w)4.217 F 4.037(ord. If)
-.1 F 1.538(the line is empty)4.038 F 4.038(,t)-.65 G 1.538(he w)-4.038
F 1.538(ords and)-.1 F .066(prompt are displayed ag)144 463.2 R 2.566
(ain. If)-.05 F .065(EOF is read, the command completes.)2.566 F(An)
5.065 E 2.565(yo)-.15 G .065(ther v)-2.565 F .065(alue read causes)-.25
F F2(name)144.36 475.2 Q F0 .953(to be set to null.)3.633 F .953
(The line read is sa)5.953 F -.15(ve)-.2 G 3.454(di).15 G 3.454(nt)
-3.454 G .954(he v)-3.454 F(ariable)-.25 E F3(REPL)3.454 E(Y)-.828 E F4
(.)A F0(The)5.454 E F2(list)3.544 E F0 .954(is e)4.134 F -.15(xe)-.15 G
.954(cuted after).15 F .072(each selection until a)144 487.2 R F1(br)
2.571 E(eak)-.18 E F0 .071(command is e)2.571 F -.15(xe)-.15 G 2.571
(cuted. The).15 F -.15(ex)2.571 G .071(it status of).15 F F1(select)
2.571 E F0 .071(is the e)2.571 F .071(xit status of the)-.15 F
(last command e)144 499.2 Q -.15(xe)-.15 G(cuted in).15 E F2(list)2.59 E
F0 2.5(,o).68 G 2.5(rz)-2.5 G(ero if no commands were e)-2.5 E -.15(xe)
-.15 G(cuted.).15 E F1(case)108 516 Q F2(wor)2.5 E(d)-.37 E F1(in)2.5 E
F0 2.5([[)2.5 G(\(])-2.5 E F2(pattern)2.5 E F0([)2.5 E F1(|)2.5 E F2
(pattern)2.5 E F0 2.5(].)2.5 G(.. \))-2.5 E F2(list)2.5 E F0(;; ] ...)
2.5 E F1(esac)2.5 E F0(A)144 528 Q F1(case)3.264 E F0 .764
(command \214rst e)3.264 F(xpands)-.15 E F2(wor)3.264 E(d)-.37 E F0
3.264(,a)C .764(nd tries to match it ag)-3.264 F .764(ainst each)-.05 F
F2(pattern)3.264 E F0 .765(in turn, using the)3.264 F .884
(matching rules described under)144 540 R F1 -.1(Pa)3.384 G(tter).1 E
3.384(nM)-.15 G(atching)-3.384 E F0(belo)3.384 E 4.684 -.65(w. T)-.25 H
(he).65 E F2(wor)3.384 E(d)-.37 E F0 .884(is e)3.384 F .883
(xpanded using tilde e)-.15 F(x-)-.15 E .95(pansion, parameter and v)144
552 R .95(ariable e)-.25 F .95(xpansion, arithmetic e)-.15 F .95
(xpansion, command substitution, process)-.15 F .181
(substitution and quote remo)144 564 R -.25(va)-.15 G 2.681(l. Each).25
F F2(pattern)2.681 E F0 -.15(ex)2.681 G .181(amined is e).15 F .181
(xpanded using tilde e)-.15 F .18(xpansion, param-)-.15 F .103
(eter and v)144 576 R .103(ariable e)-.25 F .103(xpansion, arithmetic e)
-.15 F .103(xpansion, command substitution, and process substitution.)
-.15 F .687(If the)144 588 R F1(nocasematch)3.187 E F0 .687
(shell option is enabled, the match is performed without re)3.187 F -.05
(ga)-.15 G .687(rd to the case of).05 F .464(alphabetic characters.)144
600 R .464(When a match is found, the corresponding)5.464 F F2(list)
2.964 E F0 .464(is e)2.964 F -.15(xe)-.15 G 2.964(cuted. If).15 F(the)
2.964 E F1(;;)2.964 E F0(opera-)2.964 E .675(tor is used, no subsequent\
 matches are attempted after the \214rst pattern match.)144 612 R(Using)
5.674 E F1(;&)3.174 E F0 .674(in place)3.174 F(of)144 624 Q F1(;;)2.866
E F0 .366(causes e)2.866 F -.15(xe)-.15 G .366
(cution to continue with the).15 F F2(list)2.866 E F0 .367
(associated with the ne)2.866 F .367(xt set of patterns.)-.15 F(Using)
5.367 E F1(;;&)2.867 E F0 .596(in place of)144 636 R F1(;;)3.096 E F0
.596(causes the shell to test the ne)3.096 F .595
(xt pattern list in the statement, if an)-.15 F 1.895 -.65(y, a)-.15 H
.595(nd e).65 F -.15(xe)-.15 G .595(cute an).15 F(y)-.15 E(associated)
144 648 Q F2(list)2.96 E F0 .461
(on a successful match, continuing the case statement e)2.96 F -.15(xe)
-.15 G .461(cution as if the pattern list).15 F .677(had not matched.)
144 660 R .677(The e)5.677 F .677
(xit status is zero if no pattern matches.)-.15 F .676
(Otherwise, it is the e)5.677 F .676(xit status of)-.15 F
(the last command e)144 672 Q -.15(xe)-.15 G(cuted in).15 E F2(list)2.5
E F0(.)A F1(if)108 688.8 Q F2(list)2.5 E F0(;)A F1(then)2.5 E F2(list)
2.5 E F0 2.5(;[)C F1(elif)A F2(list)2.5 E F0(;)A F1(then)2.5 E F2(list)
2.5 E F0 2.5(;].)C(.. [)-2.5 E F1(else)2.5 E F2(list)2.5 E F0 2.5(;])C
F1<8c>A F0(The)144 700.8 Q F1(if)2.977 E F2(list)3.067 E F0 .478(is e)
3.658 F -.15(xe)-.15 G 2.978(cuted. If).15 F .478(its e)2.978 F .478
(xit status is zero, the)-.15 F F1(then)2.978 E F2(list)2.978 E F0 .478
(is e)2.978 F -.15(xe)-.15 G 2.978(cuted. Otherwise,).15 F(each)2.978 E
F1(elif)2.978 E F2(list)2.978 E F0 1.088(is e)144 712.8 R -.15(xe)-.15 G
1.088(cuted in turn, and if its e).15 F 1.087
(xit status is zero, the corresponding)-.15 F F1(then)3.587 E F2(list)
3.587 E F0 1.087(is e)3.587 F -.15(xe)-.15 G 1.087(cuted and the).15 F
1.239(command completes.)144 724.8 R 1.239(Otherwise, the)6.239 F F1
(else)3.739 E F2(list)3.739 E F0 1.239(is e)3.739 F -.15(xe)-.15 G 1.239
(cuted, if present.).15 F 1.24(The e)6.239 F 1.24(xit status is the e)
-.15 F(xit)-.15 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(6)
195.395 E 0 Cg EP
%%Page: 7 7
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E
(status of the last command e)144 84 Q -.15(xe)-.15 G
(cuted, or zero if no condition tested true.).15 E/F1 10/Times-Bold@0 SF
(while)108 100.8 Q/F2 10/Times-Italic@0 SF(list-1)2.5 E F0(;)A F1(do)2.5
E F2(list-2)2.5 E F0(;)A F1(done)2.5 E(until)108 112.8 Q F2(list-1)2.5 E
F0(;)A F1(do)2.5 E F2(list-2)2.5 E F0(;)A F1(done)2.5 E F0(The)144 124.8
Q F1(while)3.45 E F0 .95(command continuously e)3.45 F -.15(xe)-.15 G
.95(cutes the list).15 F F2(list-2)3.45 E F0 .95
(as long as the last command in the list)3.45 F F2(list-1)144 136.8 Q F0
.205(returns an e)2.705 F .205(xit status of zero.)-.15 F(The)5.205 E F1
(until)2.705 E F0 .205(command is identical to the)2.705 F F1(while)
2.705 E F0 .205(command, e)2.705 F(xcept)-.15 E .6(that the test is ne)
144 148.8 R -.05(ga)-.15 G(ted:).05 E F2(list-2)3.19 E F0 .6(is e)3.12 F
-.15(xe)-.15 G .599(cuted as long as the last command in).15 F F2
(list-1)3.189 E F0 .599(returns a non-zero)3.099 F -.15(ex)144 160.8 S
.204(it status.).15 F .204(The e)5.204 F .204(xit status of the)-.15 F
F1(while)2.704 E F0(and)2.704 E F1(until)2.704 E F0 .205
(commands is the e)2.704 F .205(xit status of the last command)-.15 F
-.15(exe)144 172.8 S(cuted in).15 E F2(list-2)2.5 E F0 2.5(,o)C 2.5(rz)
-2.5 G(ero if none w)-2.5 E(as e)-.1 E -.15(xe)-.15 G(cuted.).15 E F1
(Copr)87 189.6 Q(ocesses)-.18 E F0(A)108 201.6 Q F2(copr)3.713 E(ocess)
-.45 E F0 1.213(is a shell command preceded by the)3.713 F F1(copr)3.712
E(oc)-.18 E F0(reserv)3.712 E 1.212(ed w)-.15 F 3.712(ord. A)-.1 F 1.212
(coprocess is e)3.712 F -.15(xe)-.15 G 1.212(cuted asyn-).15 F .574(chr\
onously in a subshell, as if the command had been terminated with the)
108 213.6 R F1(&)3.075 E F0 .575(control operator)3.075 F 3.075(,w)-.4 G
.575(ith a tw)-3.075 F(o-)-.1 E -.1(wa)108 225.6 S 2.5(yp).1 G
(ipe established between the e)-2.5 E -.15(xe)-.15 G
(cuting shell and the coprocess.).15 E(The format for a coprocess is:)
108 242.4 Q F1(copr)144 259.2 Q(oc)-.18 E F0([)2.5 E F2 -.27(NA)C(ME).27
E F0(])A F2(command)2.5 E F0([)2.5 E F2 -.37(re)C(dir).37 E(ections)-.37
E F0(])A .709(This creates a coprocess named)108 276 R F2 -.27(NA)3.208
G(ME).27 E F0 5.708(.I)C(f)-5.708 E F2 -.27(NA)3.208 G(ME).27 E F0 .708
(is not supplied, the def)3.208 F .708(ault name is)-.1 F F1(COPR)3.208
E(OC)-.3 E F0(.)A F2 -.27(NA)5.708 G(ME).27 E F0 .64
(must not be supplied if)108 288 R F2(command)3.14 E F0 .64(is a)3.14 F
F2 .64(simple command)3.14 F F0 .64(\(see abo)3.14 F -.15(ve)-.15 G .64
(\); otherwise, it is interpreted as the \214rst).15 F -.1(wo)108 300 S
.349(rd of the simple command.).1 F .348(When the coprocess is e)5.348 F
-.15(xe)-.15 G .348(cuted, the shell creates an array v).15 F .348
(ariable \(see)-.25 F F1(Ar)2.848 E(-)-.37 E(rays)108 312 Q F0(belo)
3.095 E .595(w\) named)-.25 F F2 -.27(NA)3.095 G(ME).27 E F0 .595
(in the conte)3.095 F .595(xt of the e)-.15 F -.15(xe)-.15 G .595
(cuting shell.).15 F .596(The standard output of)5.595 F F2(command)
3.296 E F0 .596(is con-)3.866 F .387
(nected via a pipe to a \214le descriptor in the e)108 324 R -.15(xe)
-.15 G .387(cuting shell, and that \214le descriptor is assigned to).15
F F2 -.27(NA)2.886 G(ME).27 E F0([0].)A .57(The standard input of)108
336 R F2(command)3.27 E F0 .571
(is connected via a pipe to a \214le descriptor in the e)3.84 F -.15(xe)
-.15 G .571(cuting shell, and that).15 F 1.221
(\214le descriptor is assigned to)108 348 R F2 -.27(NA)3.721 G(ME).27 E
F0 3.721([1]. This)B 1.221(pipe is established before an)3.721 F 3.72
(yr)-.15 G 1.22(edirections speci\214ed by the)-3.72 F 1.58
(command \(see)108 360 R/F3 9/Times-Bold@0 SF(REDIRECTION)4.08 E F0
(belo)3.83 E 4.08(w\). The)-.25 F 1.581
(\214le descriptors can be utilized as ar)4.08 F 1.581
(guments to shell com-)-.18 F .149
(mands and redirections using standard w)108 372 R .149(ord e)-.1 F
2.649(xpansions. Other)-.15 F .148(than those created to e)2.649 F -.15
(xe)-.15 G .148(cute command and).15 F 2.462
(process substitutions, the \214le descriptors are not a)108 384 R -.25
(va)-.2 G 2.463(ilable in subshells.).25 F 2.463
(The process ID of the shell)7.463 F(spa)108 396 Q 1.115(wned to e)-.15
F -.15(xe)-.15 G 1.115(cute the coprocess is a).15 F -.25(va)-.2 G 1.115
(ilable as the v).25 F 1.115(alue of the v)-.25 F(ariable)-.25 E F2 -.27
(NA)3.615 G(ME).27 E F0 3.615(_PID. The)B F1(wait)3.615 E F0 -.2(bu)
3.615 G(iltin).2 E(command may be used to w)108 408 Q
(ait for the coprocess to terminate.)-.1 E .336
(Since the coprocess is created as an asynchronous command, the)108
424.8 R F1(copr)2.836 E(oc)-.18 E F0 .336(command al)2.836 F -.1(wa)-.1
G .336(ys returns success.).1 F
(The return status of a coprocess is the e)108 436.8 Q(xit status of)
-.15 E F2(command)2.5 E F0(.)A F1(Shell Function De\214nitions)87 453.6
Q F0 2.698(As)108 465.6 S .198
(hell function is an object that is called lik)-2.698 F 2.698(eas)-.1 G
.198(imple command and e)-2.698 F -.15(xe)-.15 G .197
(cutes a compound command with).15 F 2.5(an)108 477.6 S .5 -.25(ew s)
-2.5 H(et of positional parameters.).25 E
(Shell functions are declared as follo)5 E(ws:)-.25 E F2(fname)108 494.4
Q F0(\(\))2.5 E F2(compound\255command)2.5 E F0([)2.5 E F2 -.37(re)C
(dir).37 E(ection)-.37 E F0(])A F1(function)108 506.4 Q F2(fname)2.5 E
F0([\(\)])2.5 E F2(compound\255command)2.5 E F0([)2.5 E F2 -.37(re)C
(dir).37 E(ection)-.37 E F0(])A .216(This de\214nes a function named)144
518.4 R F2(fname)2.716 E F0 5.217(.T)C .217(he reserv)-5.217 F .217
(ed w)-.15 F(ord)-.1 E F1(function)2.717 E F0 .217(is optional.)2.717 F
.217(If the)5.217 F F1(function)2.717 E F0(re-)2.717 E(serv)144 530.4 Q
.68(ed w)-.15 F .68(ord is supplied, the parentheses are optional.)-.1 F
(The)5.68 E F2(body)3.18 E F0 .68(of the function is the compound)3.18 F
(command)144 542.4 Q F2(compound\255command)2.784 E F0(\(see)3.354 E F1
.084(Compound Commands)2.584 F F0(abo)2.584 E -.15(ve)-.15 G 2.584
(\). That).15 F .084(command is usually a)2.584 F F2(list)144 554.4 Q F0
.044(of commands between { and }, b)2.544 F .044(ut may be an)-.2 F
2.544(yc)-.15 G .044(ommand listed under)-2.544 F F1 .044
(Compound Commands)2.544 F F0(abo)144 566.4 Q -.15(ve)-.15 G 2.901(,w)
.15 G .401(ith one e)-2.901 F .401(xception: If the)-.15 F F1(function)
2.901 E F0(reserv)2.901 E .401(ed w)-.15 F .401(ord is used, b)-.1 F
.402(ut the parentheses are not sup-)-.2 F 1.046
(plied, the braces are required.)144 578.4 R F2(compound\255command)
6.046 E F0 1.046(is e)3.546 F -.15(xe)-.15 G 1.046(cuted whene).15 F
-.15(ve)-.25 G(r).15 E F2(fname)3.546 E F0 1.045(is speci\214ed as)3.546
F .365(the name of a simple command.)144 590.4 R .365(When in)5.365 F F2
.366(posix mode)2.865 F F0(,)A F2(fname)2.866 E F0 .366(must be a v)
2.866 F .366(alid shell)-.25 F F2(name)2.866 E F0 .366(and may)2.866 F
.894(not be the name of one of the POSIX)144 602.4 R F2 .893(special b)
3.393 F(uiltins)-.2 E F0 5.893(.I)C 3.393(nd)-5.893 G(ef)-3.393 E .893
(ault mode, a function name can be)-.1 F(an)144 614.4 Q 3.649(yu)-.15 G
1.149(nquoted shell w)-3.649 F 1.15(ord that does not contain)-.1 F F1
($)3.65 E F0 6.15(.A)C 1.45 -.15(ny r)-6.15 H 1.15(edirections \(see).15
F F3(REDIRECTION)3.65 E F0(belo)3.4 E(w\))-.25 E .417(speci\214ed when \
a function is de\214ned are performed when the function is e)144 626.4 R
-.15(xe)-.15 G 2.916(cuted. The).15 F -.15(ex)2.916 G .416(it status).15
F .733(of a function de\214nition is zero unless a syntax error occurs \
or a readonly function with the same)144 638.4 R .178(name already e)144
650.4 R 2.678(xists. When)-.15 F -.15(exe)2.678 G .178(cuted, the e).15
F .178(xit status of a function is the e)-.15 F .177
(xit status of the last com-)-.15 F(mand e)144 662.4 Q -.15(xe)-.15 G
(cuted in the body).15 E 5(.\()-.65 G(See)-5 E F3(FUNCTIONS)2.5 E F0
(belo)2.25 E -.65(w.)-.25 G(\)).65 E/F4 10.95/Times-Bold@0 SF(COMMENTS)
72 679.2 Q F0 .982(In a non-interacti)108 691.2 R 1.282 -.15(ve s)-.25 H
.982(hell, or an interacti).15 F 1.282 -.15(ve s)-.25 H .982
(hell in which the).15 F F1(interacti)3.482 E -.1(ve)-.1 G(_comments).1
E F0 .982(option to the)3.482 F F1(shopt)3.482 E F0 -.2(bu)108 703.2 S
.952(iltin is enabled \(see).2 F F3 .952(SHELL B)3.452 F(UIL)-.09 E .952
(TIN COMMANDS)-.828 F F0(belo)3.202 E .952(w\), a w)-.25 F .952(ord be)
-.1 F .952(ginning with)-.15 F F1(#)3.451 E F0 .951(causes that w)3.451
F(ord)-.1 E .604
(and all remaining characters on that line to be ignored.)108 715.2 R
.605(An interacti)5.605 F .905 -.15(ve s)-.25 H .605(hell without the)
.15 F F1(interacti)3.105 E -.1(ve)-.1 G(_com-).1 E(ments)108 727.2 Q F0
1.337(option enabled does not allo)3.837 F 3.837(wc)-.25 G 3.836
(omments. The)-3.837 F F1(interacti)3.836 E -.1(ve)-.1 G(_comments).1 E
F0 1.336(option is on by def)3.836 F 1.336(ault in)-.1 F(GNU Bash 5.1)72
768 Q(2020 October 29)141.235 E(7)195.395 E 0 Cg EP
%%Page: 8 8
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(interacti)108 84 Q
.3 -.15(ve s)-.25 H(hells.).15 E/F1 10.95/Times-Bold@0 SF -.11(QU)72
100.8 S -.438(OT).11 G(ING).438 E/F2 10/Times-Italic@0 SF(Quoting)108
112.8 Q F0 .477(is used to remo)2.977 F .777 -.15(ve t)-.15 H .477
(he special meaning of certain characters or w).15 F .477
(ords to the shell.)-.1 F .478(Quoting can be)5.478 F .185
(used to disable special treatment for special characters, to pre)108
124.8 R -.15(ve)-.25 G .185(nt reserv).15 F .184(ed w)-.15 F .184
(ords from being recognized as)-.1 F(such, and to pre)108 136.8 Q -.15
(ve)-.25 G(nt parameter e).15 E(xpansion.)-.15 E .288(Each of the)108
153.6 R F2(metac)2.788 E(har)-.15 E(acter)-.15 E(s)-.1 E F0 .288
(listed abo)2.788 F .588 -.15(ve u)-.15 H(nder).15 E/F3 9/Times-Bold@0
SF(DEFINITIONS)2.788 E F0 .288
(has special meaning to the shell and must be)2.538 F
(quoted if it is to represent itself.)108 165.6 Q 1.345
(When the command history e)108 182.4 R 1.344(xpansion f)-.15 F 1.344
(acilities are being used \(see)-.1 F F3(HIST)3.844 E(OR)-.162 E 3.594
(YE)-.315 G(XP)-3.594 E(ANSION)-.666 E F0(belo)3.594 E 1.344(w\), the)
-.25 F F2(history e)108 194.4 Q(xpansion)-.2 E F0(character)2.5 E 2.5
(,u)-.4 G(sually)-2.5 E/F4 10/Times-Bold@0 SF(!)2.5 E F0 2.5(,m)C
(ust be quoted to pre)-2.5 E -.15(ve)-.25 G(nt history e).15 E
(xpansion.)-.15 E(There are three quoting mechanisms: the)108 211.2 Q F2
(escape c)2.69 E(har)-.15 E(acter)-.15 E F0 2.5(,s).73 G
(ingle quotes, and double quotes.)-2.5 E 2.962(An)108 228 S .463
(on-quoted backslash \()-2.962 F F4(\\)A F0 2.963(\)i)C 2.963(st)-2.963
G(he)-2.963 E F2 .463(escape c)3.153 F(har)-.15 E(acter)-.15 E F0 5.463
(.I).73 G 2.963(tp)-5.463 G(reserv)-2.963 E .463(es the literal v)-.15 F
.463(alue of the ne)-.25 F .463(xt character that)-.15 F(follo)108 240 Q
1.554(ws, with the e)-.25 F 1.553(xception of <ne)-.15 F 4.053
(wline>. If)-.25 F(a)4.053 E F4(\\)4.053 E F0(<ne)A 1.553
(wline> pair appears, and the backslash is not itself)-.25 F .347
(quoted, the)108 252 R F4(\\)2.847 E F0(<ne)A .347
(wline> is treated as a line continuation \(that is, it is remo)-.25 F
-.15(ve)-.15 G 2.848(df).15 G .348(rom the input stream and ef-)-2.848 F
(fecti)108 264 Q -.15(ve)-.25 G(ly ignored\).).15 E .295
(Enclosing characters in single quotes preserv)108 280.8 R .295
(es the literal v)-.15 F .295(alue of each character within the quotes.)
-.25 F 2.795(As)5.295 G(in-)-2.795 E
(gle quote may not occur between single quotes, e)108 292.8 Q -.15(ve)
-.25 G 2.5(nw).15 G(hen preceded by a backslash.)-2.5 E .033
(Enclosing characters in double quotes preserv)108 309.6 R .034
(es the literal v)-.15 F .034
(alue of all characters within the quotes, with the)-.25 F -.15(ex)108
321.6 S .108(ception of).15 F F4($)2.608 E F0(,)A F4<92>2.608 E F0(,)A
F4(\\)2.608 E F0 2.608(,a)C .107(nd, when history e)-2.608 F .107
(xpansion is enabled,)-.15 F F4(!)2.607 E F0 5.107(.W)C .107
(hen the shell is in)-5.107 F F2 .107(posix mode)2.607 F F0 2.607(,t)C
(he)-2.607 E F4(!)2.607 E F0 .107(has no)2.607 F .46
(special meaning within double quotes, e)108 333.6 R -.15(ve)-.25 G 2.96
(nw).15 G .46(hen history e)-2.96 F .46(xpansion is enabled.)-.15 F .46
(The characters)5.46 F F4($)2.96 E F0(and)2.96 E F4<92>2.96 E F0(re-)
2.96 E .563(tain their special meaning within double quotes.)108 345.6 R
.562(The backslash retains its special meaning only when fol-)5.563 F
(lo)108 357.6 Q .601(wed by one of the follo)-.25 F .602
(wing characters:)-.25 F F4($)3.102 E F0(,)A F4<92>3.102 E F0(,)A F4(")
3.935 E F0(,).833 E F4(\\)3.102 E F0 3.102(,o)C(r)-3.102 E F4(<newline>)
3.102 E F0 5.602(.A)C .602(double quote may be quoted within)-2.5 F .131
(double quotes by preceding it with a backslash.)108 369.6 R .131
(If enabled, history e)5.131 F .13(xpansion will be performed unless an)
-.15 F F4(!)2.63 E F0
(appearing in double quotes is escaped using a backslash.)108 381.6 Q
(The backslash preceding the)5 E F4(!)2.5 E F0(is not remo)5 E -.15(ve)
-.15 G(d.).15 E(The special parameters)108 398.4 Q F4(*)2.5 E F0(and)2.5
E F4(@)2.5 E F0(ha)2.5 E .3 -.15(ve s)-.2 H
(pecial meaning when in double quotes \(see).15 E F3 -.666(PA)2.5 G
(RAMETERS).666 E F0(belo)2.25 E(w\).)-.25 E -.8(Wo)108 415.2 S .211
(rds of the form).8 F F4($)2.711 E F0<08>A F2(string)A F0 2.711<0861>C
.211(re treated specially)-2.711 F 5.211(.T)-.65 G .211(he w)-5.211 F
.211(ord e)-.1 F .212(xpands to)-.15 F F2(string)2.712 E F0 2.712(,w)C
.212(ith backslash-escaped char)-2.712 F(-)-.2 E .605
(acters replaced as speci\214ed by the ANSI C standard.)108 427.2 R .604
(Backslash escape sequences, if present, are decoded)5.605 F(as follo)
108 439.2 Q(ws:)-.25 E F4(\\a)144 451.2 Q F0(alert \(bell\))180 451.2 Q
F4(\\b)144 463.2 Q F0(backspace)180 463.2 Q F4(\\e)144 475.2 Q(\\E)144
487.2 Q F0(an escape character)180 487.2 Q F4(\\f)144 499.2 Q F0
(form feed)180 499.2 Q F4(\\n)144 511.2 Q F0(ne)180 511.2 Q 2.5(wl)-.25
G(ine)-2.5 E F4(\\r)144 523.2 Q F0(carriage return)180 523.2 Q F4(\\t)
144 535.2 Q F0(horizontal tab)180 535.2 Q F4(\\v)144 547.2 Q F0 -.15(ve)
180 547.2 S(rtical tab).15 E F4(\\\\)144 559.2 Q F0(backslash)180 559.2
Q F4<5c08>144 571.2 Q F0(single quote)180 571.2 Q F4(\\")144 583.2 Q F0
(double quote)180 583.2 Q F4(\\?)144 595.2 Q F0(question mark)180 595.2
Q F4(\\)144 607.2 Q F2(nnn)A F0(the eight-bit character whose v)180
607.2 Q(alue is the octal v)-.25 E(alue)-.25 E F2(nnn)2.5 E F0
(\(one to three octal digits\))2.5 E F4(\\x)144 619.2 Q F2(HH)A F0
(the eight-bit character whose v)180 619.2 Q(alue is the he)-.25 E
(xadecimal v)-.15 E(alue)-.25 E F2(HH)2.5 E F0(\(one or tw)2.5 E 2.5(oh)
-.1 G .3 -.15(ex d)-2.5 H(igits\)).15 E F4(\\u)144 631.2 Q F2(HHHH)A F0
1.506(the Unicode \(ISO/IEC 10646\) character whose v)180 643.2 R 1.507
(alue is the he)-.25 F 1.507(xadecimal v)-.15 F(alue)-.25 E F2(HHHH)
4.007 E F0(\(one to four he)180 655.2 Q 2.5(xd)-.15 G(igits\))-2.5 E F4
(\\U)144 667.2 Q F2(HHHHHHHH)A F0 .548
(the Unicode \(ISO/IEC 10646\) character whose v)180 679.2 R .547
(alue is the he)-.25 F .547(xadecimal v)-.15 F(alue)-.25 E F2(HHHHH-)
3.047 E(HHH)180 691.2 Q F0(\(one to eight he)2.5 E 2.5(xd)-.15 G
(igits\))-2.5 E F4(\\c)144 703.2 Q F2(x)A F0 2.5(ac)180 703.2 S(ontrol-)
-2.5 E F2(x)A F0(character)2.5 E(The e)108 720 Q(xpanded result is sing\
le-quoted, as if the dollar sign had not been present.)-.15 E
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(8)195.395 E 0 Cg EP
%%Page: 9 9
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E 2.64(Ad)108 84 S
.14(ouble-quoted string preceded by a dollar sign \()-2.64 F/F1 10
/Times-Bold@0 SF($)A F0(")A/F2 10/Times-Italic@0 SF(string)A F0 .14
("\) will cause the string to be translated according)B .31
(to the current locale.)108 96 R(The)5.31 E F2 -.1(ge)2.809 G(tte).1 E
(xt)-.2 E F0 .309(infrastructure performs the message catalog lookup an\
d translation, using)2.809 F(the)108 108 Q F1(LC_MESSA)2.625 E(GES)-.55
E F0(and)2.625 E F1(TEXTDOMAIN)2.625 E F0 .125(shell v)2.625 F 2.625
(ariables. If)-.25 F .126(the current locale is)2.626 F F1(C)2.626 E F0
(or)2.626 E F1(POSIX)2.626 E F0 2.626(,o)C 2.626(ri)-2.626 G 2.626(ft)
-2.626 G(here)-2.626 E .362(are no translations a)108 120 R -.25(va)-.2
G .362(ilable, the dollar sign is ignored.).25 F .362
(If the string is translated and replaced, the replace-)5.362 F
(ment is double-quoted.)108 132 Q/F3 10.95/Times-Bold@0 SF -.81(PA)72
148.8 S(RAMETERS).81 E F0(A)108 160.8 Q F2(par)4.574 E(ameter)-.15 E F0
.824(is an entity that stores v)4.054 F 3.324(alues. It)-.25 F .824
(can be a)3.324 F F2(name)3.685 E F0 3.325(,an).18 G(umber)-3.325 E
3.325(,o)-.4 G 3.325(ro)-3.325 G .825(ne of the special characters)
-3.325 F .802(listed belo)108 172.8 R 3.302(wu)-.25 G(nder)-3.302 E F1
.802(Special P)3.302 F(arameters)-.1 E F0 5.802(.A)C F2(variable)-2.21 E
F0 .802(is a parameter denoted by a)3.482 F F2(name)3.662 E F0 5.801(.A)
.18 G -.25(va)-2.5 G .801(riable has a).25 F F2(value)108 184.8 Q F0
.368(and zero or more)2.868 F F2(attrib)2.868 E(utes)-.2 E F0 5.369(.A)C
(ttrib)-5.369 E .369(utes are assigned using the)-.2 F F1(declar)2.869 E
(e)-.18 E F0 -.2(bu)2.869 G .369(iltin command \(see).2 F F1(declar)
2.869 E(e)-.18 E F0(belo)108 196.8 Q 2.5(wi)-.25 G(n)-2.5 E/F4 9
/Times-Bold@0 SF(SHELL B)2.5 E(UIL)-.09 E(TIN COMMANDS)-.828 E/F5 9
/Times-Roman@0 SF(\).)A F0 2.755(Ap)108 213.6 S .255
(arameter is set if it has been assigned a v)-2.755 F 2.754(alue. The)
-.25 F .254(null string is a v)2.754 F .254(alid v)-.25 F 2.754
(alue. Once)-.25 F 2.754(av)2.754 G .254(ariable is set, it)-3.004 F
(may be unset only by using the)108 225.6 Q F1(unset)2.5 E F0 -.2(bu)2.5
G(iltin command \(see).2 E F4(SHELL B)2.5 E(UIL)-.09 E(TIN COMMANDS)
-.828 E F0(belo)2.25 E(w\).)-.25 E(A)108 242.4 Q F2(variable)2.79 E F0
(may be assigned to by a statement of the form)2.68 E F2(name)144 259.2
Q F0(=[)A F2(value)A F0(])A(If)108 276 Q F2(value)3.022 E F0 .232
(is not gi)2.912 F -.15(ve)-.25 G .232(n, the v).15 F .232
(ariable is assigned the null string.)-.25 F(All)5.233 E F2(values)3.023
E F0(under)3.003 E .233(go tilde e)-.18 F .233(xpansion, parameter)-.15
F .515(and v)108 288 R .515(ariable e)-.25 F .515
(xpansion, command substitution, arithmetic e)-.15 F .515
(xpansion, and quote remo)-.15 F -.25(va)-.15 G 3.015(l\().25 G(see)
-3.015 E F4(EXP)3.015 E(ANSION)-.666 E F0(belo)108 300 Q 2.698(w\). If)
-.25 F .198(the v)2.698 F .198(ariable has its)-.25 F F1(integer)2.698 E
F0(attrib)2.698 E .198(ute set, then)-.2 F F2(value)2.988 E F0 .198
(is e)2.878 F -.25(va)-.25 G .199(luated as an arithmetic e).25 F .199
(xpression e)-.15 F -.15(ve)-.25 G(n).15 E .902(if the $\(\(...\)\) e)
108 312 R .902(xpansion is not used \(see)-.15 F F1 .901
(Arithmetic Expansion)3.401 F F0(belo)3.401 E 3.401(w\). W)-.25 F .901
(ord splitting is not performed,)-.8 F 1.178(with the e)108 324 R 1.178
(xception of)-.15 F F1("$@")3.678 E F0 1.178(as e)3.678 F 1.179
(xplained belo)-.15 F 3.679(wu)-.25 G(nder)-3.679 E F1 1.179(Special P)
3.679 F(arameters)-.1 E F0 6.179(.P)C 1.179(athname e)-6.329 F 1.179
(xpansion is not)-.15 F 3.649(performed. Assignment)108 336 R 1.149
(statements may also appear as ar)3.649 F 1.148(guments to the)-.18 F F1
(alias)3.648 E F0(,)A F1(declar)3.648 E(e)-.18 E F0(,)A F1(typeset)3.648
E F0(,)A F1(export)3.648 E F0(,)A F1 -.18(re)108 348 S(adonly).18 E F0
3.288(,a)C(nd)-3.288 E F1(local)3.288 E F0 -.2(bu)3.288 G .788
(iltin commands \().2 F F2(declar)A(ation)-.15 E F0 3.288
(commands\). When)3.288 F(in)3.289 E F2 .789(posix mode)3.289 F F0 3.289
(,t)C .789(hese b)-3.289 F .789(uiltins may)-.2 F 1.496
(appear in a command after one or more instances of the)108 360 R F1
(command)3.996 E F0 -.2(bu)3.996 G 1.496
(iltin and retain these assignment).2 F(statement properties.)108 372 Q
.376(In the conte)108 388.8 R .376
(xt where an assignment statement is assigning a v)-.15 F .376
(alue to a shell v)-.25 F .377(ariable or array inde)-.25 F .377
(x, the +=)-.15 F 1.631
(operator can be used to append to or add to the v)108 400.8 R(ariable')
-.25 E 4.13(sp)-.55 G(re)-4.13 E 1.63(vious v)-.25 F 4.13(alue. This)
-.25 F 1.63(includes ar)4.13 F 1.63(guments to)-.18 F -.2(bu)108 412.8 S
.163(iltin commands such as).2 F F1(declar)2.664 E(e)-.18 E F0 .164
(that accept assignment statements \()2.664 F F2(declar)A(ation)-.15 E
F0 2.664(commands\). When)2.664 F .164(+= is)2.664 F .252
(applied to a v)108 424.8 R .252(ariable for which the)-.25 F F2(inte)
2.752 E -.1(ge)-.4 G(r).1 E F0(attrib)2.752 E .252(ute has been set,)-.2
F F2(value)2.752 E F0 .251(is e)2.751 F -.25(va)-.25 G .251
(luated as an arithmetic e).25 F(xpres-)-.15 E .05
(sion and added to the v)108 436.8 R(ariable')-.25 E 2.55(sc)-.55 G .05
(urrent v)-2.55 F .05(alue, which is also e)-.25 F -.25(va)-.25 G 2.55
(luated. When).25 F .05(+= is applied to an array v)2.55 F(ari-)-.25 E
.459(able using compound assignment \(see)108 448.8 R F1(Arrays)2.959 E
F0(belo)2.959 E .459(w\), the v)-.25 F(ariable')-.25 E 2.959(sv)-.55 G
.459(alue is not unset \(as it is when using)-3.209 F .265(=\), and ne)
108 460.8 R 2.765(wv)-.25 G .265(alues are appended to the array be)
-3.015 F .265(ginning at one greater than the array')-.15 F 2.765(sm)
-.55 G .265(aximum inde)-2.765 F 2.765(x\()-.15 G(for)-2.765 E(inde)108
472.8 Q -.15(xe)-.15 G 3.402(da).15 G .902
(rrays\) or added as additional k)-3.402 F -.15(ey)-.1 G<ad76>.15 E .901
(alue pairs in an associati)-.25 F 1.201 -.15(ve a)-.25 H(rray).15 E
5.901(.W)-.65 G .901(hen applied to a string-)-5.901 F -.25(va)108 484.8
S(lued v).25 E(ariable,)-.25 E F2(value)2.5 E F0(is e)2.5 E
(xpanded and appended to the v)-.15 E(ariable')-.25 E 2.5(sv)-.55 G
(alue.)-2.75 E 3.382(Av)108 501.6 S .882(ariable can be assigned the)
-3.632 F F2(namer)3.382 E(ef)-.37 E F0(attrib)3.382 E .882
(ute using the)-.2 F F1<ad6e>3.382 E F0 .882(option to the)3.382 F F1
(declar)3.382 E(e)-.18 E F0(or)3.383 E F1(local)3.383 E F0 -.2(bu)3.383
G .883(iltin com-).2 F .316(mands \(see the descriptions of)108 513.6 R
F1(declar)2.816 E(e)-.18 E F0(and)2.816 E F1(local)2.816 E F0(belo)2.816
E .316(w\) to create a)-.25 F F2(namer)2.815 E(ef)-.37 E F0 2.815(,o)C
2.815(rar)-2.815 G .315(eference to another v)-2.815 F(ari-)-.25 E 2.918
(able. This)108 525.6 R(allo)2.918 E .418(ws v)-.25 F .418
(ariables to be manipulated indirectly)-.25 F 5.419(.W)-.65 G(hene)
-5.419 E -.15(ve)-.25 G 2.919(rt).15 G .419(he nameref v)-2.919 F .419
(ariable is referenced, as-)-.25 F .133
(signed to, unset, or has its attrib)108 537.6 R .132
(utes modi\214ed \(other than using or changing the)-.2 F F2(namer)2.632
E(ef)-.37 E F0(attrib)2.632 E .132(ute itself\), the)-.2 F 1.356
(operation is actually performed on the v)108 549.6 R 1.357
(ariable speci\214ed by the nameref v)-.25 F(ariable')-.25 E 3.857(sv)
-.55 G 3.857(alue. A)-4.107 F 1.357(nameref is)3.857 F .972
(commonly used within shell functions to refer to a v)108 561.6 R .971
(ariable whose name is passed as an ar)-.25 F .971(gument to the)-.18 F
2.5(function. F)108 573.6 R(or instance, if a v)-.15 E
(ariable name is passed to a shell function as its \214rst ar)-.25 E
(gument, running)-.18 E/F6 10/Courier@0 SF(declare -n ref=$1)144 591.6 Q
F0 .302(inside the function creates a nameref v)108 609.6 R(ariable)-.25
E F1 -.18(re)2.803 G(f).18 E F0 .303(whose v)2.803 F .303(alue is the v)
-.25 F .303(ariable name passed as the \214rst ar)-.25 F(gu-)-.18 E
3.592(ment. References)108 621.6 R 1.092(and assignments to)3.592 F F1
-.18(re)3.592 G(f).18 E F0 3.592(,a)C 1.092(nd changes to its attrib)
-3.592 F 1.092(utes, are treated as references, assign-)-.2 F .143
(ments, and attrib)108 633.6 R .144(ute modi\214cations to the v)-.2 F
.144(ariable whose name w)-.25 F .144(as passed as)-.1 F F1($1)2.644 E
F0 5.144(.I)C 2.644(ft)-5.144 G .144(he control v)-2.644 F .144
(ariable in a)-.25 F F1 -.25(fo)108 645.6 S(r).25 E F0 .868
(loop has the nameref attrib)3.368 F .868(ute, the list of w)-.2 F .867
(ords can be a list of shell v)-.1 F .867
(ariables, and a name reference)-.25 F .509
(will be established for each w)108 657.6 R .509
(ord in the list, in turn, when the loop is e)-.1 F -.15(xe)-.15 G 3.009
(cuted. Array).15 F -.25(va)3.009 G .509(riables cannot be).25 F(gi)108
669.6 Q -.15(ve)-.25 G 3.032(nt).15 G(he)-3.032 E F1(namer)3.032 E(ef)
-.18 E F0(attrib)3.032 E 3.032(ute. Ho)-.2 F(we)-.25 E -.15(ve)-.25 G
1.332 -.4(r, n).15 H .532(ameref v).4 F .531
(ariables can reference array v)-.25 F .531(ariables and subscripted ar)
-.25 F(-)-.2 E .533(ray v)108 681.6 R 3.033(ariables. Namerefs)-.25 F
.533(can be unset using the)3.033 F F1<ad6e>3.033 E F0 .533
(option to the)3.033 F F1(unset)3.033 E F0 -.2(bu)3.034 G 3.034
(iltin. Otherwise,).2 F(if)3.034 E F1(unset)3.034 E F0 .534(is e)3.034 F
-.15(xe)-.15 G(-).15 E .443(cuted with the name of a nameref v)108 693.6
R .442(ariable as an ar)-.25 F .442(gument, the v)-.18 F .442
(ariable referenced by the nameref v)-.25 F(ariable)-.25 E
(will be unset.)108 705.6 Q(GNU Bash 5.1)72 768 Q(2020 October 29)
141.235 E(9)195.395 E 0 Cg EP
%%Page: 10 10
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF -.2(Po)87 84 S(sitional P).2 E(arameters)-.1 E F0(A)108 96 Q/F2 10
/Times-Italic@0 SF .705(positional par)4.455 F(ameter)-.15 E F0 .706(is\
 a parameter denoted by one or more digits, other than the single digit\
 0.)3.935 F(Posi-)5.706 E .445
(tional parameters are assigned from the shell')108 108 R 2.944(sa)-.55
G -.18(rg)-2.944 G .444(uments when it is in).18 F -.2(vo)-.4 G -.1(ke)
.2 G .444(d, and may be reassigned using).1 F(the)108 120 Q F1(set)3.333
E F0 -.2(bu)3.333 G .833(iltin command.).2 F .834(Positional parameters\
 may not be assigned to with assignment statements.)5.833 F(The)5.834 E
(positional parameters are temporarily replaced when a shell function i\
s e)108 132 Q -.15(xe)-.15 G(cuted \(see).15 E/F3 9/Times-Bold@0 SF
(FUNCTIONS)2.5 E F0(belo)2.25 E(w\).)-.25 E 1.404(When a positional par\
ameter consisting of more than a single digit is e)108 148.8 R 1.403
(xpanded, it must be enclosed in)-.15 F(braces \(see)108 160.8 Q F3(EXP)
2.5 E(ANSION)-.666 E F0(belo)2.25 E(w\).)-.25 E F1(Special P)87 177.6 Q
(arameters)-.1 E F0 1.674(The shell treats se)108 189.6 R -.15(ve)-.25 G
1.674(ral parameters specially).15 F 6.675(.T)-.65 G 1.675
(hese parameters may only be referenced; assignment to)-6.675 F
(them is not allo)108 201.6 Q(wed.)-.25 E F1(*)108 213.6 Q F0 .224
(Expands to the positional parameters, starting from one.)144 213.6 R
.223(When the e)5.224 F .223(xpansion is not within double)-.15 F .662
(quotes, each positional parameter e)144 225.6 R .662
(xpands to a separate w)-.15 F 3.162(ord. In)-.1 F(conte)3.162 E .662
(xts where it is performed,)-.15 F 1.082(those w)144 237.6 R 1.082
(ords are subject to further w)-.1 F 1.081(ord splitting and pathname e)
-.1 F 3.581(xpansion. When)-.15 F 1.081(the e)3.581 F(xpansion)-.15 E
.914(occurs within double quotes, it e)144 249.6 R .914
(xpands to a single w)-.15 F .915(ord with the v)-.1 F .915
(alue of each parameter sepa-)-.25 F .891
(rated by the \214rst character of the)144 261.6 R F3(IFS)3.39 E F0 .89
(special v)3.14 F 3.39(ariable. That)-.25 F .89(is, ")3.39 F F1($*)A F0
3.39("i)C 3.39(se)-3.39 G(qui)-3.39 E -.25(va)-.25 G .89(lent to ").25 F
F1($1)A F2(c)A F1($2)A F2(c)A F1(...)A F0(",)A(where)144 273.6 Q F2(c)
3.532 E F0 .832(is the \214rst character of the v)3.642 F .832
(alue of the)-.25 F F3(IFS)3.332 E F0 -.25(va)3.082 G 3.332(riable. If)
.25 F F3(IFS)3.332 E F0 .833(is unset, the parameters are)3.082 F
(separated by spaces.)144 285.6 Q(If)5 E F3(IFS)2.5 E F0
(is null, the parameters are joined without interv)2.25 E
(ening separators.)-.15 E F1(@)108 297.6 Q F0 .722
(Expands to the positional parameters, starting from one.)144 297.6 R
.722(In conte)5.722 F .722(xts where w)-.15 F .722(ord splitting is per)
-.1 F(-)-.2 E 1.165(formed, this e)144 309.6 R 1.165
(xpands each positional parameter to a separate w)-.15 F 1.165
(ord; if not within double quotes,)-.1 F .655(these w)144 321.6 R .655
(ords are subject to w)-.1 F .655(ord splitting.)-.1 F .655(In conte)
5.655 F .655(xts where w)-.15 F .654
(ord splitting is not performed, this)-.1 F -.15(ex)144 333.6 S .748
(pands to a single w).15 F .748
(ord with each positional parameter separated by a space.)-.1 F .748
(When the e)5.748 F(xpan-)-.15 E 1.091
(sion occurs within double quotes, each parameter e)144 345.6 R 1.091
(xpands to a separate w)-.15 F 3.59(ord. That)-.1 F 1.09(is, ")3.59 F F1
($@)A F0 3.59("i)C(s)-3.59 E(equi)144 357.6 Q -.25(va)-.25 G .412
(lent to ").25 F F1($1)A F0 2.912("")C F1($2)-2.912 E F0 2.912(".)C
2.912(.. If)-2.912 F .413(the double-quoted e)2.913 F .413
(xpansion occurs within a w)-.15 F .413(ord, the e)-.1 F .413
(xpansion of)-.15 F .38(the \214rst parameter is joined with the be)144
369.6 R .379(ginning part of the original w)-.15 F .379(ord, and the e)
-.1 F .379(xpansion of the)-.15 F .771
(last parameter is joined with the last part of the original w)144 381.6
R 3.271(ord. When)-.1 F .772(there are no positional pa-)3.271 F
(rameters, ")144 393.6 Q F1($@)A F0 2.5("a)C(nd)-2.5 E F1($@)2.5 E F0
-.15(ex)2.5 G(pand to nothing \(i.e., the).15 E 2.5(ya)-.15 G(re remo)
-2.5 E -.15(ve)-.15 G(d\).).15 E F1(#)108 405.6 Q F0
(Expands to the number of positional parameters in decimal.)144 405.6 Q
F1(?)108 417.6 Q F0(Expands to the e)144 417.6 Q
(xit status of the most recently e)-.15 E -.15(xe)-.15 G(cuted fore).15
E(ground pipeline.)-.15 E F1<ad>108 429.6 Q F0 .882
(Expands to the current option \215ags as speci\214ed upon in)144 429.6
R -.2(vo)-.4 G .881(cation, by the).2 F F1(set)3.381 E F0 -.2(bu)3.381 G
.881(iltin command, or).2 F(those set by the shell itself \(such as the)
144 441.6 Q F1<ad69>2.5 E F0(option\).)2.5 E F1($)108 453.6 Q F0 .214
(Expands to the process ID of the shell.)144 453.6 R .214
(In a \(\) subshell, it e)5.214 F .214
(xpands to the process ID of the current)-.15 F
(shell, not the subshell.)144 465.6 Q F1(!)108 477.6 Q F0 .499(Expands \
to the process ID of the job most recently placed into the background, \
whether e)144 477.6 R -.15(xe)-.15 G(cuted).15 E
(as an asynchronous command or using the)144 489.6 Q F1(bg)2.5 E F0 -.2
(bu)2.5 G(iltin \(see).2 E F3(JOB CONTR)2.5 E(OL)-.27 E F0(belo)2.25 E
(w\).)-.25 E F1(0)108 501.6 Q F0 .886
(Expands to the name of the shell or shell script.)144 501.6 R .886
(This is set at shell initialization.)5.886 F(If)5.887 E F1(bash)3.387 E
F0 .887(is in-)3.387 F -.2(vo)144 513.6 S -.1(ke).2 G 2.668(dw).1 G .168
(ith a \214le of commands,)-2.668 F F1($0)2.668 E F0 .167
(is set to the name of that \214le.)2.667 F(If)5.167 E F1(bash)2.667 E
F0 .167(is started with the)2.667 F F1<ad63>2.667 E F0(op-)2.667 E .895
(tion, then)144 525.6 R F1($0)3.395 E F0 .895(is set to the \214rst ar)
3.395 F .895(gument after the string to be e)-.18 F -.15(xe)-.15 G .896
(cuted, if one is present.).15 F(Other)5.896 E(-)-.2 E
(wise, it is set to the \214lename used to in)144 537.6 Q -.2(vo)-.4 G
-.1(ke).2 G F1(bash)2.6 E F0 2.5(,a)C 2.5(sg)-2.5 G -2.15 -.25(iv e)-2.5
H 2.5(nb).25 G 2.5(ya)-2.5 G -.18(rg)-2.5 G(ument zero.).18 E F1
(Shell V)87 554.4 Q(ariables)-.92 E F0(The follo)108 566.4 Q(wing v)-.25
E(ariables are set by the shell:)-.25 E F1(_)108 583.2 Q F0 1.526
(At shell startup, set to the pathname used to in)144 583.2 R -.2(vo)-.4
G 1.725 -.1(ke t).2 H 1.525(he shell or shell script being e).1 F -.15
(xe)-.15 G 1.525(cuted as).15 F .173(passed in the en)144 595.2 R .173
(vironment or ar)-.4 F .173(gument list.)-.18 F(Subsequently)5.173 E
2.673(,e)-.65 G .173(xpands to the last ar)-2.823 F .174
(gument to the pre-)-.18 F .337(vious simple command e)144 607.2 R -.15
(xe)-.15 G .337(cuted in the fore).15 F .336(ground, after e)-.15 F
2.836(xpansion. Also)-.15 F .336(set to the full pathname)2.836 F .365
(used to in)144 619.2 R -.2(vo)-.4 G .565 -.1(ke e).2 H .365
(ach command e).1 F -.15(xe)-.15 G .366(cuted and placed in the en).15 F
.366(vironment e)-.4 F .366(xported to that command.)-.15 F(When checki\
ng mail, this parameter holds the name of the mail \214le currently bei\
ng check)144 631.2 Q(ed.)-.1 E F1 -.3(BA)108 643.2 S(SH).3 E F0
(Expands to the full \214lename used to in)144 643.2 Q -.2(vo)-.4 G .2
-.1(ke t).2 H(his instance of).1 E F1(bash)2.5 E F0(.)A F1 -.3(BA)108
655.2 S(SHOPTS).3 E F0 2.549(Ac)144 667.2 S .049
(olon-separated list of enabled shell options.)-2.549 F .049(Each w)
5.049 F .049(ord in the list is a v)-.1 F .049(alid ar)-.25 F .049
(gument for the)-.18 F F1<ad73>2.548 E F0 .115(option to the)144 679.2 R
F1(shopt)2.616 E F0 -.2(bu)2.616 G .116(iltin command \(see).2 F F3 .116
(SHELL B)2.616 F(UIL)-.09 E .116(TIN COMMANDS)-.828 F F0(belo)2.366 E
2.616(w\). The)-.25 F .116(options ap-)2.616 F 1.067(pearing in)144
691.2 R F3 -.27(BA)3.567 G(SHOPTS).27 E F0 1.067(are those reported as)
3.317 F F2(on)3.797 E F0(by)3.807 E F1(shopt)3.567 E F0 6.066(.I)C 3.566
(ft)-6.066 G 1.066(his v)-3.566 F 1.066(ariable is in the en)-.25 F
(vironment)-.4 E(when)144 703.2 Q F1(bash)3.141 E F0 .642(starts up, ea\
ch shell option in the list will be enabled before reading an)3.141 F
3.142(ys)-.15 G .642(tartup \214les.)-3.142 F(This v)144 715.2 Q
(ariable is read-only)-.25 E(.)-.65 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(10)190.395 E 0 Cg EP
%%Page: 11 11
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF -.3(BA)108 84 S(SHPID).3 E F0 .188
(Expands to the process ID of the current)144 96 R F1(bash)2.688 E F0
2.687(process. This)2.687 F(dif)2.687 E .187(fers from)-.25 F F1($$)
2.687 E F0 .187(under certain circum-)2.687 F .548
(stances, such as subshells that do not require)144 108 R F1(bash)3.048
E F0 .548(to be re-initialized.)3.048 F .549(Assignments to)5.549 F/F2 9
/Times-Bold@0 SF -.27(BA)3.049 G(SHPID).27 E F0(ha)144 120 Q .3 -.15
(ve n)-.2 H 2.5(oe).15 G -.25(ff)-2.5 G 2.5(ect. If).25 F F1 -.3(BA)2.5
G(SHPID).3 E F0(is unset, it loses its special properties, e)2.5 E -.15
(ve)-.25 G 2.5(ni).15 G 2.5(fi)-2.5 G 2.5(ti)-2.5 G 2.5(ss)-2.5 G
(ubsequently reset.)-2.5 E F1 -.3(BA)108 132 S(SH_ALIASES).3 E F0 1.195
(An associati)144 144 R 1.495 -.15(ve a)-.25 H 1.195(rray v).15 F 1.195
(ariable whose members correspond to the internal list of aliases as ma\
in-)-.25 F .16(tained by the)144 156 R F1(alias)2.66 E F0 -.2(bu)2.66 G
2.66(iltin. Elements).2 F .16
(added to this array appear in the alias list; ho)2.66 F(we)-.25 E -.15
(ve)-.25 G .96 -.4(r, u).15 H(nsetting).4 E 4.503
(array elements currently does not cause aliases to be remo)144 168 R
-.15(ve)-.15 G 7.003(df).15 G 4.503(rom the alias list.)-7.003 F(If)
9.502 E F1 -.3(BA)144 180 S(SH_ALIASES).3 E F0
(is unset, it loses its special properties, e)2.5 E -.15(ve)-.25 G 2.5
(ni).15 G 2.5(fi)-2.5 G 2.5(ti)-2.5 G 2.5(ss)-2.5 G(ubsequently reset.)
-2.5 E F1 -.3(BA)108 192 S(SH_ARGC).3 E F0 .934(An array v)144 204 R
.934(ariable whose v)-.25 F .934
(alues are the number of parameters in each frame of the current)-.25 F
F1(bash)3.435 E F0 -.15(exe)144 216 S .535(cution call stack.).15 F .535
(The number of parameters to the current subroutine \(shell function or\
 script)5.535 F -.15(exe)144 228 S .141(cuted with).15 F F1(.)2.641 E F0
(or)2.641 E F1(sour)2.641 E(ce)-.18 E F0 2.641(\)i)C 2.641(sa)-2.641 G
2.641(tt)-2.641 G .142(he top of the stack.)-2.641 F .142
(When a subroutine is e)5.142 F -.15(xe)-.15 G .142
(cuted, the number of).15 F 1.265(parameters passed is pushed onto)144
240 R F2 -.27(BA)3.765 G(SH_ARGC).27 E/F3 9/Times-Roman@0 SF(.)A F0
1.265(The shell sets)5.765 F F2 -.27(BA)3.765 G(SH_ARGC).27 E F0 1.265
(only when in e)3.515 F(x-)-.15 E .947(tended deb)144 252 R .947
(ugging mode \(see the description of the)-.2 F F1(extdeb)3.447 E(ug)-.2
E F0 .947(option to the)3.447 F F1(shopt)3.447 E F0 -.2(bu)3.448 G .948
(iltin belo).2 F(w\).)-.25 E(Setting)144 264 Q F1(extdeb)3.363 E(ug)-.2
E F0 .863(after the shell has started to e)3.363 F -.15(xe)-.15 G .862
(cute a script, or referencing this v).15 F .862(ariable when)-.25 F F1
(extdeb)144 276 Q(ug)-.2 E F0(is not set, may result in inconsistent v)
2.5 E(alues.)-.25 E F1 -.3(BA)108 288 S(SH_ARGV).3 E F0 .206(An array v)
144 300 R .206(ariable containing all of the parameters in the current)
-.25 F F1(bash)2.706 E F0 -.15(exe)2.706 G .207(cution call stack.).15 F
.207(The \214-)5.207 F .567(nal parameter of the last subroutine call i\
s at the top of the stack; the \214rst parameter of the initial)144 312
R 1.424(call is at the bottom.)144 324 R 1.424(When a subroutine is e)
6.424 F -.15(xe)-.15 G 1.424
(cuted, the parameters supplied are pushed onto).15 F F2 -.27(BA)144 336
S(SH_ARGV).27 E F3(.)A F0 .854(The shell sets)5.354 F F2 -.27(BA)3.354 G
(SH_ARGV).27 E F0 .853(only when in e)3.104 F .853(xtended deb)-.15 F
.853(ugging mode \(see the de-)-.2 F .475(scription of the)144 348 R F1
(extdeb)2.975 E(ug)-.2 E F0 .475(option to the)2.975 F F1(shopt)2.975 E
F0 -.2(bu)2.975 G .475(iltin belo).2 F 2.975(w\). Setting)-.25 F F1
(extdeb)2.976 E(ug)-.2 E F0 .476(after the shell has)2.976 F .45
(started to e)144 360 R -.15(xe)-.15 G .45
(cute a script, or referencing this v).15 F .45(ariable when)-.25 F F1
(extdeb)2.95 E(ug)-.2 E F0 .45(is not set, may result in in-)2.95 F
(consistent v)144 372 Q(alues.)-.25 E F1 -.3(BA)108 384 S(SH_ARGV0).3 E
F0 .25(When referenced, this v)144 396 R .25(ariable e)-.25 F .251
(xpands to the name of the shell or shell script \(identical to)-.15 F
F1($0)2.751 E F0 2.751(;s)C(ee)-2.751 E .041
(the description of special parameter 0 abo)144 408 R -.15(ve)-.15 G
2.541(\). Assignment).15 F(to)2.541 E F1 -.3(BA)2.541 G(SH_ARGV0).3 E F0
.04(causes the v)2.541 F .04(alue as-)-.25 F .216
(signed to also be assigned to)144 420 R F1($0)2.716 E F0 5.216(.I)C(f)
-5.216 E F1 -.3(BA)2.716 G(SH_ARGV0).3 E F0 .216
(is unset, it loses its special properties, e)2.716 F -.15(ve)-.25 G
2.716(ni).15 G(f)-2.716 E(it is subsequently reset.)144 432 Q F1 -.3(BA)
108 444 S(SH_CMDS).3 E F0 .668(An associati)144 456 R .968 -.15(ve a)
-.25 H .668(rray v).15 F .668(ariable whose members correspond to the i\
nternal hash table of commands)-.25 F .195(as maintained by the)144 468
R F1(hash)2.695 E F0 -.2(bu)2.695 G 2.695(iltin. Elements).2 F .196
(added to this array appear in the hash table; ho)2.696 F(we)-.25 E -.15
(ve)-.25 G -.4(r,).15 G .852(unsetting array elements currently does no\
t cause command names to be remo)144 480 R -.15(ve)-.15 G 3.352(df).15 G
.852(rom the hash)-3.352 F 2.5(table. If)144 492 R F1 -.3(BA)2.5 G
(SH_CMDS).3 E F0(is unset, it loses its special properties, e)2.5 E -.15
(ve)-.25 G 2.5(ni).15 G 2.5(fi)-2.5 G 2.5(ti)-2.5 G 2.5(ss)-2.5 G
(ubsequently reset.)-2.5 E F1 -.3(BA)108 504 S(SH_COMMAND).3 E F0 1.242
(The command currently being e)144 516 R -.15(xe)-.15 G 1.243
(cuted or about to be e).15 F -.15(xe)-.15 G 1.243
(cuted, unless the shell is e).15 F -.15(xe)-.15 G 1.243(cuting a).15 F
.263(command as the result of a trap, in which case it is the command e)
144 528 R -.15(xe)-.15 G .262(cuting at the time of the trap.).15 F(If)
144 540 Q F1 -.3(BA)2.5 G(SH_COMMAND).3 E F0
(is unset, it loses its special properties, e)2.5 E -.15(ve)-.25 G 2.5
(ni).15 G 2.5(fi)-2.5 G 2.5(ti)-2.5 G 2.5(ss)-2.5 G(ubsequently reset.)
-2.5 E F1 -.3(BA)108 552 S(SH_EXECUTION_STRING).3 E F0(The command ar)
144 564 Q(gument to the)-.18 E F1<ad63>2.5 E F0(in)2.5 E -.2(vo)-.4 G
(cation option.).2 E F1 -.3(BA)108 576 S(SH_LINENO).3 E F0 .692
(An array v)144 588 R .692(ariable whose members are the line numbers i\
n source \214les where each corresponding)-.25 F .97(member of)144 600 R
F2(FUNCN)3.47 E(AME)-.18 E F0 -.1(wa)3.22 G 3.47(si).1 G -1.9 -.4(nv o)
-3.47 H -.1(ke).4 G(d.).1 E F1(${B)5.969 E(ASH_LINENO[)-.3 E/F4 10
/Times-Italic@0 SF($i)A F1(]})A F0 .969
(is the line number in the source)3.469 F 14.671(\214le \()144 612 R F1
(${B)A(ASH_SOURCE[)-.3 E F4($i+1)A F1(]})A F0 17.171(\)w)C(here)-17.171
E F1(${FUNCN)17.172 E(AME[)-.2 E F4($i)A F1(]})A F0 -.1(wa)17.172 G
17.172(sc).1 G 14.672(alled \(or)-17.172 F F1(${B)144 624 Q(ASH_LINENO[)
-.3 E F4($i-1)A F1(]})A F0 .115
(if referenced within another shell function\).)2.615 F(Use)5.115 E F2
(LINENO)2.615 E F0 .115(to obtain the)2.365 F(current line number)144
636 Q(.)-.55 E F1 -.3(BA)108 648 S(SH_LO).3 E(AD)-.4 E(ABLES_P)-.35 E
-.95(AT)-.74 G(H).95 E F0 4.07(Ac)144 660 S 1.57(olon-separated list of\
 directories in which the shell looks for dynamically loadable b)-4.07 F
(uiltins)-.2 E(speci\214ed by the)144 672 Q F1(enable)2.5 E F0(command.)
2.5 E F1 -.3(BA)108 684 S(SH_REMA).3 E(TCH)-.95 E F0 .006(An array v)144
696 R .006(ariable whose members are assigned by the)-.25 F F1(=~)2.506
E F0 .005(binary operator to the)2.506 F F1([[)2.505 E F0 .005
(conditional com-)2.505 F 2.506(mand. The)144 708 R .007
(element with inde)2.506 F 2.507(x0i)-.15 G 2.507(st)-2.507 G .007
(he portion of the string matching the entire re)-2.507 F .007(gular e)
-.15 F(xpression.)-.15 E 4.331(The element with inde)144 720 R(x)-.15 E
F4(n)6.831 E F0 4.331(is the portion of the string matching the)6.831 F
F4(n)6.83 E F0 4.33(th parenthesized)B(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(11)190.395 E 0 Cg EP
%%Page: 12 12
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(sube)144 84 Q
(xpression.)-.15 E/F1 10/Times-Bold@0 SF -.3(BA)108 96 S(SH_SOURCE).3 E
F0 .125(An array v)144 108 R .125(ariable whose members are the source \
\214lenames where the corresponding shell function)-.25 F .781
(names in the)144 120 R/F2 9/Times-Bold@0 SF(FUNCN)3.28 E(AME)-.18 E F0
.78(array v)3.03 F .78(ariable are de\214ned.)-.25 F .78
(The shell function)5.78 F F1(${FUNCN)3.28 E(AME[)-.2 E/F3 10
/Times-Italic@0 SF($i)A F1(]})A F0(is)3.28 E(de\214ned in the \214le)144
132 Q F1(${B)2.5 E(ASH_SOURCE[)-.3 E F3($i)A F1(]})A F0(and called from)
2.5 E F1(${B)2.5 E(ASH_SOURCE[)-.3 E F3($i+1)A F1(]})A F0(.)A F1 -.3(BA)
108 144 S(SH_SUBSHELL).3 E F0 .296
(Incremented by one within each subshell or subshell en)144 156 R .296
(vironment when the shell be)-.4 F .297(gins e)-.15 F -.15(xe)-.15 G
(cuting).15 E 1.277(in that en)144 168 R 3.777(vironment. The)-.4 F
1.277(initial v)3.777 F 1.277(alue is 0.)-.25 F(If)6.277 E F1 -.3(BA)
3.777 G(SH_SUBSHELL).3 E F0 1.276(is unset, it loses its special)3.777 F
(properties, e)144 180 Q -.15(ve)-.25 G 2.5(ni).15 G 2.5(fi)-2.5 G 2.5
(ti)-2.5 G 2.5(ss)-2.5 G(ubsequently reset.)-2.5 E F1 -.3(BA)108 192 S
(SH_VERSINFO).3 E F0 2.644(Ar)144 204 S .144(eadonly array v)-2.644 F
.144(ariable whose members hold v)-.25 F .144
(ersion information for this instance of)-.15 F F1(bash)2.645 E F0 5.145
(.T)C(he)-5.145 E -.25(va)144 216 S
(lues assigned to the array members are as follo).25 E(ws:)-.25 E F1 -.3
(BA)144 234 S(SH_VERSINFO[).3 E F0(0)A F1(])A F0(The major v)264 234 Q
(ersion number \(the)-.15 E F3 -.37(re)2.5 G(lease).37 E F0(\).)A F1 -.3
(BA)144 246 S(SH_VERSINFO[).3 E F0(1)A F1(])A F0(The minor v)264 246 Q
(ersion number \(the)-.15 E F3(ver)2.5 E(sion)-.1 E F0(\).)A F1 -.3(BA)
144 258 S(SH_VERSINFO[).3 E F0(2)A F1(])A F0(The patch le)264 258 Q -.15
(ve)-.25 G(l.).15 E F1 -.3(BA)144 270 S(SH_VERSINFO[).3 E F0(3)A F1(])A
F0(The b)264 270 Q(uild v)-.2 E(ersion.)-.15 E F1 -.3(BA)144 282 S
(SH_VERSINFO[).3 E F0(4)A F1(])A F0(The release status \(e.g.,)264 282 Q
F3(beta1)2.5 E F0(\).)A F1 -.3(BA)144 294 S(SH_VERSINFO[).3 E F0(5)A F1
(])A F0(The v)264 294 Q(alue of)-.25 E F2(MA)2.5 E(CHTYPE)-.495 E/F4 9
/Times-Roman@0 SF(.)A F1 -.3(BA)108 306 S(SH_VERSION).3 E F0
(Expands to a string describing the v)144 318 Q
(ersion of this instance of)-.15 E F1(bash)2.5 E F0(.)A F1(COMP_CW)108
330 Q(ORD)-.1 E F0 .397(An inde)144 342 R 2.897(xi)-.15 G(nto)-2.897 E
F1(${COMP_W)2.896 E(ORDS})-.1 E F0 .396(of the w)2.896 F .396
(ord containing the current cursor position.)-.1 F .396(This v)5.396 F
(ari-)-.25 E 1.18(able is a)144 354 R -.25(va)-.2 G 1.181
(ilable only in shell functions in).25 F -.2(vo)-.4 G -.1(ke).2 G 3.681
(db).1 G 3.681(yt)-3.681 G 1.181(he programmable completion f)-3.681 F
1.181(acilities \(see)-.1 F F1(Pr)144 366 Q(ogrammable Completion)-.18 E
F0(belo)2.5 E(w\).)-.25 E F1(COMP_KEY)108 378 Q F0(The k)144 390 Q .3
-.15(ey \()-.1 H(or \214nal k).15 E .3 -.15(ey o)-.1 H 2.5(fak).15 G .3
-.15(ey s)-2.6 H(equence\) used to in).15 E -.2(vo)-.4 G .2 -.1(ke t).2
H(he current completion function.).1 E F1(COMP_LINE)108 402 Q F0 1.208
(The current command line.)144 414 R 1.208(This v)6.208 F 1.208
(ariable is a)-.25 F -.25(va)-.2 G 1.208
(ilable only in shell functions and e).25 F 1.207(xternal com-)-.15 F
1.037(mands in)144 426 R -.2(vo)-.4 G -.1(ke).2 G 3.537(db).1 G 3.537
(yt)-3.537 G 1.037(he programmable completion f)-3.537 F 1.037
(acilities \(see)-.1 F F1(Pr)3.537 E 1.037(ogrammable Completion)-.18 F
F0(be-)3.537 E(lo)144 438 Q(w\).)-.25 E F1(COMP_POINT)108 450 Q F0 .667
(The inde)144 462 R 3.167(xo)-.15 G 3.167(ft)-3.167 G .666
(he current cursor position relati)-3.167 F .966 -.15(ve t)-.25 H 3.166
(ot).15 G .666(he be)-3.166 F .666(ginning of the current command.)-.15
F .666(If the)5.666 F .534
(current cursor position is at the end of the current command, the v)144
474 R .535(alue of this v)-.25 F .535(ariable is equal to)-.25 F F1
(${#COMP_LINE})144 486 Q F0 5.705(.T)C .705(his v)-5.705 F .704
(ariable is a)-.25 F -.25(va)-.2 G .704
(ilable only in shell functions and e).25 F .704(xternal commands in-)
-.15 F -.2(vo)144 498 S -.1(ke).2 G 2.5(db).1 G 2.5(yt)-2.5 G
(he programmable completion f)-2.5 E(acilities \(see)-.1 E F1(Pr)2.5 E
(ogrammable Completion)-.18 E F0(belo)2.5 E(w\).)-.25 E F1(COMP_TYPE)108
510 Q F0 .041(Set to an inte)144 522 R .041(ger v)-.15 F .041(alue corr\
esponding to the type of completion attempted that caused a completion)
-.25 F .338(function to be called:)144 534 R F3 -.5(TA)2.837 G(B).5 E F0
2.837(,f)C .337(or normal completion,)-2.837 F F3(?)2.837 E F0 2.837(,f)
C .337(or listing completions after successi)-2.837 F .637 -.15(ve t)
-.25 H(abs,).15 E F3(!)144 546 Q F0 3.067(,f)C .567
(or listing alternati)-3.067 F -.15(ve)-.25 G 3.067(so).15 G 3.067(np)
-3.067 G .567(artial w)-3.067 F .567(ord completion,)-.1 F F3(@)3.067 E
F0 3.067(,t)C 3.067(ol)-3.067 G .567(ist completions if the w)-3.067 F
.567(ord is not un-)-.1 F .418(modi\214ed, or)144 558 R F3(%)2.918 E F0
2.918(,f)C .418(or menu completion.)-2.918 F .417(This v)5.417 F .417
(ariable is a)-.25 F -.25(va)-.2 G .417
(ilable only in shell functions and e).25 F(xter)-.15 E(-)-.2 E .704
(nal commands in)144 570 R -.2(vo)-.4 G -.1(ke).2 G 3.204(db).1 G 3.204
(yt)-3.204 G .704(he programmable completion f)-3.204 F .704
(acilities \(see)-.1 F F1(Pr)3.204 E .704(ogrammable Comple-)-.18 F
(tion)144 582 Q F0(belo)2.5 E(w\).)-.25 E F1(COMP_W)108 594 Q(ORDBREAKS)
-.1 E F0 1.336(The set of characters that the)144 606 R F1 -.18(re)3.836
G(adline).18 E F0 1.336(library treats as w)3.836 F 1.335
(ord separators when performing w)-.1 F(ord)-.1 E 3.125(completion. If)
144 618 R F2(COMP_W)3.125 E(ORDBREAKS)-.09 E F0 .626
(is unset, it loses its special properties, e)2.875 F -.15(ve)-.25 G
3.126(ni).15 G 3.126(fi)-3.126 G 3.126(ti)-3.126 G 3.126(ss)-3.126 G
(ubse-)-3.126 E(quently reset.)144 630 Q F1(COMP_W)108 642 Q(ORDS)-.1 E
F0 .654(An array v)144 654 R .654(ariable \(see)-.25 F F1(Arrays)3.154 E
F0(belo)3.154 E .654(w\) consisting of the indi)-.25 F .653(vidual w)
-.25 F .653(ords in the current command)-.1 F 3.191(line. The)144 666 R
.692(line is split into w)3.192 F .692(ords as)-.1 F F1 -.18(re)3.192 G
(adline).18 E F0 -.1(wo)3.192 G .692(uld split it, using).1 F F2(COMP_W)
3.192 E(ORDBREAKS)-.09 E F0 .692(as de-)2.942 F 1.558(scribed abo)144
678 R -.15(ve)-.15 G 6.558(.T).15 G 1.558(his v)-6.558 F 1.558
(ariable is a)-.25 F -.25(va)-.2 G 1.558
(ilable only in shell functions in).25 F -.2(vo)-.4 G -.1(ke).2 G 4.057
(db).1 G 4.057(yt)-4.057 G 1.557(he programmable)-4.057 F(completion f)
144 690 Q(acilities \(see)-.1 E F1(Pr)2.5 E(ogrammable Completion)-.18 E
F0(belo)2.5 E(w\).)-.25 E F1(COPR)108 702 Q(OC)-.3 E F0 .168(An array v)
144 714 R .168(ariable \(see)-.25 F F1(Arrays)2.668 E F0(belo)2.669 E
.169
(w\) created to hold the \214le descriptors for output from and input)
-.25 F(to an unnamed coprocess \(see)144 726 Q F1(Copr)2.5 E(ocesses)
-.18 E F0(abo)2.5 E -.15(ve)-.15 G(\).).15 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(12)190.395 E 0 Cg EP
%%Page: 13 13
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(DIRST)108 84 Q -.55(AC)-.9 G(K).55 E F0 .79(An array v)144 96 R .79
(ariable \(see)-.25 F F1(Arrays)3.29 E F0(belo)3.289 E .789
(w\) containing the current contents of the directory stack.)-.25 F(Di-)
5.789 E .099(rectories appear in the stack in the order the)144 108 R
2.599(ya)-.15 G .099(re displayed by the)-2.599 F F1(dirs)2.599 E F0 -.2
(bu)2.599 G 2.599(iltin. Assigning).2 F .099(to mem-)2.599 F .84
(bers of this array v)144 120 R .84
(ariable may be used to modify directories already in the stack, b)-.25
F .84(ut the)-.2 F F1(pushd)3.34 E F0(and)144 132 Q F1(popd)3.45 E F0
-.2(bu)3.45 G .951(iltins must be used to add and remo).2 F 1.251 -.15
(ve d)-.15 H 3.451(irectories. Assignment).15 F .951(to this v)3.451 F
.951(ariable will)-.25 F .379(not change the current directory)144 144 R
5.379(.I)-.65 G(f)-5.379 E/F2 9/Times-Bold@0 SF(DIRST)2.879 E -.495(AC)
-.81 G(K).495 E F0 .378(is unset, it loses its special properties, e)
2.629 F -.15(ve)-.25 G 2.878(ni).15 G 2.878(fi)-2.878 G 2.878(ti)-2.878
G(s)-2.878 E(subsequently reset.)144 156 Q F1(EPOCHREAL)108 168 Q(TIME)
-.92 E F0 .337(Each time this parameter is referenced, it e)144 180 R
.338(xpands to the number of seconds since the Unix Epoch)-.15 F(\(see)
144 192 Q/F3 10/Times-Italic@0 SF(time)2.917 E F0 .417
(\(3\)\) as a \215oating point v)B .416
(alue with micro-second granularity)-.25 F 5.416(.A)-.65 G .416
(ssignments to)-5.416 F F2(EPOCHRE-)2.916 E(AL)144 204 Q(TIME)-.828 E F0
1.09(are ignored.)3.34 F(If)6.09 E F2(EPOCHREAL)3.59 E(TIME)-.828 E F0
1.09(is unset, it loses its special properties, e)3.34 F -.15(ve)-.25 G
3.591(ni).15 G 3.591(fi)-3.591 G 3.591(ti)-3.591 G(s)-3.591 E
(subsequently reset.)144 216 Q F1(EPOCHSECONDS)108 228 Q F0 .338
(Each time this parameter is referenced, it e)144 240 R .337
(xpands to the number of seconds since the Unix Epoch)-.15 F(\(see)144
252 Q F3(time)4.041 E F0 4.041(\(3\)\). Assignments)B(to)4.041 E F2
(EPOCHSECONDS)4.041 E F0 1.542(are ignored.)3.792 F(If)6.542 E F2
(EPOCHSECONDS)4.042 E F0 1.542(is unset, it)3.792 F
(loses its special properties, e)144 264 Q -.15(ve)-.25 G 2.5(ni).15 G
2.5(fi)-2.5 G 2.5(ti)-2.5 G 2.5(ss)-2.5 G(ubsequently reset.)-2.5 E F1
(EUID)108 276 Q F0 1.104(Expands to the ef)144 276 R(fecti)-.25 E 1.403
-.15(ve u)-.25 H 1.103(ser ID of the current user).15 F 3.603(,i)-.4 G
1.103(nitialized at shell startup.)-3.603 F 1.103(This v)6.103 F 1.103
(ariable is)-.25 F(readonly)144 288 Q(.)-.65 E F1(FUNCN)108 300 Q(AME)
-.2 E F0 .478(An array v)144 312 R .479
(ariable containing the names of all shell functions currently in the e)
-.25 F -.15(xe)-.15 G .479(cution call stack.).15 F .277
(The element with inde)144 324 R 2.777(x0i)-.15 G 2.777(st)-2.777 G .276
(he name of an)-2.777 F 2.776(yc)-.15 G(urrently-e)-2.776 E -.15(xe)-.15
G .276(cuting shell function.).15 F .276(The bottom-most)5.276 F .384
(element \(the one with the highest inde)144 336 R .384(x\) is)-.15 F/F4
10/Courier@0 SF("main")2.884 E F0 5.384(.T)C .384(his v)-5.384 F .385
(ariable e)-.25 F .385(xists only when a shell func-)-.15 F .076
(tion is e)144 348 R -.15(xe)-.15 G 2.576(cuting. Assignments).15 F(to)
2.576 E F2(FUNCN)2.576 E(AME)-.18 E F0(ha)2.326 E .376 -.15(ve n)-.2 H
2.576(oe).15 G -.25(ff)-2.576 G 2.576(ect. If).25 F F2(FUNCN)2.575 E
(AME)-.18 E F0 .075(is unset, it loses its)2.325 F
(special properties, e)144 360 Q -.15(ve)-.25 G 2.5(ni).15 G 2.5(fi)-2.5
G 2.5(ti)-2.5 G 2.5(ss)-2.5 G(ubsequently reset.)-2.5 E .11(This v)144
378 R .111(ariable can be used with)-.25 F F1 -.3(BA)2.611 G(SH_LINENO)
.3 E F0(and)2.611 E F1 -.3(BA)2.611 G(SH_SOURCE).3 E F0 5.111(.E)C .111
(ach element of)-5.111 F F1(FUNC-)2.611 E -.2(NA)144 390 S(ME).2 E F0
1.404(has corresponding elements in)3.904 F F1 -.3(BA)3.904 G(SH_LINENO)
.3 E F0(and)3.904 E F1 -.3(BA)3.904 G(SH_SOURCE).3 E F0 1.404
(to describe the)3.904 F .012(call stack.)144 402 R -.15(Fo)5.012 G
2.512(ri).15 G(nstance,)-2.512 E F1(${FUNCN)2.512 E(AME[)-.2 E F3($i)A
F1(]})A F0 -.1(wa)2.512 G 2.512(sc).1 G .012(alled from the \214le)
-2.512 F F1(${B)2.512 E(ASH_SOURCE[)-.3 E F3($i+1)A F1(]})A F0 1.184
(at line number)144 414 R F1(${B)3.684 E(ASH_LINENO[)-.3 E F3($i)A F1
(]})A F0 6.184(.T)C(he)-6.184 E F1(caller)3.683 E F0 -.2(bu)3.683 G
1.183(iltin displays the current call stack using).2 F
(this information.)144 426 Q F1(GR)108 438 Q(OUPS)-.3 E F0 1.228
(An array v)144 450 R 1.228(ariable containing the list of groups of wh\
ich the current user is a member)-.25 F 6.229(.A)-.55 G(ssign-)-6.229 E
.572(ments to)144 462 R F2(GR)3.072 E(OUPS)-.27 E F0(ha)2.822 E .872
-.15(ve n)-.2 H 3.072(oe).15 G -.25(ff)-3.072 G 3.072(ect. If).25 F F2
(GR)3.072 E(OUPS)-.27 E F0 .572
(is unset, it loses its special properties, e)2.822 F -.15(ve)-.25 G
3.072(ni).15 G 3.071(fi)-3.072 G 3.071(ti)-3.071 G(s)-3.071 E
(subsequently reset.)144 474 Q F1(HISTCMD)108 486 Q F0 2.81
(The history number)144 498 R 5.31(,o)-.4 G 5.31(ri)-5.31 G(nde)-5.31 E
5.311(xi)-.15 G 5.311(nt)-5.311 G 2.811
(he history list, of the current command.)-5.311 F 2.811(Assignments to)
7.811 F F2(HISTCMD)144 510 Q F0 1.135(are ignored.)3.385 F(If)6.135 E F2
(HISTCMD)3.635 E F0 1.135(is unset, it loses its special properties, e)
3.385 F -.15(ve)-.25 G 3.634(ni).15 G 3.634(fi)-3.634 G 3.634(ti)-3.634
G 3.634(ss)-3.634 G(ubse-)-3.634 E(quently reset.)144 522 Q F1(HOSTN)108
534 Q(AME)-.2 E F0(Automatically set to the name of the current host.)
144 546 Q F1(HOSTTYPE)108 558 Q F0 .222(Automatically set to a string t\
hat uniquely describes the type of machine on which)144 570 R F1(bash)
2.723 E F0 .223(is e)2.723 F -.15(xe)-.15 G(cut-).15 E 2.5(ing. The)144
582 R(def)2.5 E(ault is system-dependent.)-.1 E F1(LINENO)108 594 Q F0
1.408(Each time this parameter is referenced, the shell substitutes a d\
ecimal number representing the)144 606 R .078(current sequential line n\
umber \(starting with 1\) within a script or function.)144 618 R .079
(When not in a script or)5.078 F .307(function, the v)144 630 R .307
(alue substituted is not guaranteed to be meaningful.)-.25 F(If)5.306 E
F2(LINENO)2.806 E F0 .306(is unset, it loses its)2.556 F
(special properties, e)144 642 Q -.15(ve)-.25 G 2.5(ni).15 G 2.5(fi)-2.5
G 2.5(ti)-2.5 G 2.5(ss)-2.5 G(ubsequently reset.)-2.5 E F1(MA)108 654 Q
(CHTYPE)-.55 E F0 .898(Automatically set to a string that fully describ\
es the system type on which)144 666 R F1(bash)3.398 E F0 .899(is e)3.398
F -.15(xe)-.15 G .899(cuting, in).15 F(the standard GNU)144 678 Q F3
(cpu-company-system)2.5 E F0 2.5(format. The)2.5 F(def)2.5 E
(ault is system-dependent.)-.1 E F1(MAPFILE)108 690 Q F0 .294
(An array v)144 702 R .294(ariable \(see)-.25 F F1(Arrays)2.794 E F0
(belo)2.794 E .294(w\) created to hold the te)-.25 F .293
(xt read by the)-.15 F F1(map\214le)2.793 E F0 -.2(bu)2.793 G .293
(iltin when no).2 F -.25(va)144 714 S(riable name is supplied.).25 E
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(13)190.395 E 0 Cg EP
%%Page: 14 14
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(OLDPWD)108 84 Q F0(The pre)144 96 Q(vious w)-.25 E
(orking directory as set by the)-.1 E F1(cd)2.5 E F0(command.)2.5 E F1
(OPT)108 108 Q(ARG)-.9 E F0 1.626(The v)144 120 R 1.627
(alue of the last option ar)-.25 F 1.627(gument processed by the)-.18 F
F1(getopts)4.127 E F0 -.2(bu)4.127 G 1.627(iltin command \(see).2 F/F2 9
/Times-Bold@0 SF(SHELL)4.127 E -.09(BU)144 132 S(IL).09 E(TIN COMMANDS)
-.828 E F0(belo)2.25 E(w\).)-.25 E F1(OPTIND)108 144 Q F0 1.652
(The inde)144 156 R 4.152(xo)-.15 G 4.152(ft)-4.152 G 1.652(he ne)-4.152
F 1.652(xt ar)-.15 F 1.652(gument to be processed by the)-.18 F F1
(getopts)4.151 E F0 -.2(bu)4.151 G 1.651(iltin command \(see).2 F F2
(SHELL)4.151 E -.09(BU)144 168 S(IL).09 E(TIN COMMANDS)-.828 E F0(belo)
2.25 E(w\).)-.25 E F1(OSTYPE)108 180 Q F0 .329(Automatically set to a s\
tring that describes the operating system on which)144 192 R F1(bash)
2.83 E F0 .33(is e)2.83 F -.15(xe)-.15 G 2.83(cuting. The).15 F(def)144
204 Q(ault is system-dependent.)-.1 E F1(PIPEST)108 216 Q -.95(AT)-.9 G
(US).95 E F0 .61(An array v)144 228 R .61(ariable \(see)-.25 F F1
(Arrays)3.11 E F0(belo)3.11 E .61(w\) containing a list of e)-.25 F .61
(xit status v)-.15 F .61(alues from the processes in)-.25 F
(the most-recently-e)144 240 Q -.15(xe)-.15 G(cuted fore).15 E
(ground pipeline \(which may contain only a single command\).)-.15 E F1
(PPID)108 252 Q F0(The process ID of the shell')144 252 Q 2.5(sp)-.55 G
2.5(arent. This)-2.5 F -.25(va)2.5 G(riable is readonly).25 E(.)-.65 E
F1(PWD)108 264 Q F0(The current w)144 264 Q
(orking directory as set by the)-.1 E F1(cd)2.5 E F0(command.)2.5 E F1
(RANDOM)108 276 Q F0 .417(Each time this parameter is referenced, it e)
144 288 R .417(xpands to a random inte)-.15 F .417
(ger between 0 and 32767.)-.15 F(As-)5.417 E .551(signing a v)144 300 R
.551(alue to)-.25 F F2(RANDOM)3.051 E F0 .551
(initializes \(seeds\) the sequence of random numbers.)2.801 F(If)5.55 E
F2(RANDOM)3.05 E F0(is)2.8 E(unset, it loses its special properties, e)
144 312 Q -.15(ve)-.25 G 2.5(ni).15 G 2.5(fi)-2.5 G 2.5(ti)-2.5 G 2.5
(ss)-2.5 G(ubsequently reset.)-2.5 E F1(READLINE_LINE)108 324 Q F0 1.546
(The contents of the)144 336 R F1 -.18(re)4.047 G(adline).18 E F0 1.547
(line b)4.047 F(uf)-.2 E(fer)-.25 E 4.047(,f)-.4 G 1.547(or use with)
-4.047 F/F3 10/Courier@0 SF 1.547(bind -x)4.047 F F0(\(see)4.047 E F2
1.547(SHELL B)4.047 F(UIL)-.09 E 1.547(TIN COM-)-.828 F(MANDS)144 348 Q
F0(belo)2.25 E(w\).)-.25 E F1(READLINE_MARK)108 360 Q F0 .107
(The position of the mark \(sa)144 372 R -.15(ve)-.2 G 2.607(di).15 G
.107(nsertion point\) in the)-2.607 F F1 -.18(re)2.606 G(adline).18 E F0
.106(line b)2.606 F(uf)-.2 E(fer)-.25 E 2.606(,f)-.4 G .106(or use with)
-2.606 F F3 .106(bind -x)2.606 F F0(\(see)144 384 Q F2 1.016(SHELL B)
3.516 F(UIL)-.09 E 1.016(TIN COMMANDS)-.828 F F0(belo)3.266 E 3.516
(w\). The)-.25 F 1.017(characters between the insertion point and the)
3.516 F(mark are often called the)144 396 Q/F4 10/Times-Italic@0 SF -.37
(re)2.5 G(gion)-.03 E F0(.)A F1(READLINE_POINT)108 408 Q F0 .314
(The position of the insertion point in the)144 420 R F1 -.18(re)2.813 G
(adline).18 E F0 .313(line b)2.813 F(uf)-.2 E(fer)-.25 E 2.813(,f)-.4 G
.313(or use with)-2.813 F F3 .313(bind -x)2.813 F F0(\(see)2.813 E F2
(SHELL)2.813 E -.09(BU)144 432 S(IL).09 E(TIN COMMANDS)-.828 E F0(belo)
2.25 E(w\).)-.25 E F1(REPL)108 444 Q(Y)-.92 E F0
(Set to the line of input read by the)144 456 Q F1 -.18(re)2.5 G(ad).18
E F0 -.2(bu)2.5 G(iltin command when no ar).2 E(guments are supplied.)
-.18 E F1(SECONDS)108 468 Q F0 .795(Each time this parameter is referen\
ced, the number of seconds since shell in)144 480 R -.2(vo)-.4 G .795
(cation is returned.).2 F .713(If a v)144 492 R .712
(alue is assigned to)-.25 F F2(SECONDS)3.212 E/F5 9/Times-Roman@0 SF(,)A
F0 .712(the v)2.962 F .712
(alue returned upon subsequent references is the number)-.25 F .627
(of seconds since the assignment plus the v)144 504 R .627
(alue assigned.)-.25 F .628(The number of seconds at shell in)5.627 F
-.2(vo)-.4 G(ca-).2 E .458(tion and the current time is al)144 516 R -.1
(wa)-.1 G .458(ys determined by querying the system clock.).1 F(If)5.457
E F2(SECONDS)2.957 E F0 .457(is un-)2.707 F
(set, it loses its special properties, e)144 528 Q -.15(ve)-.25 G 2.5
(ni).15 G 2.5(fi)-2.5 G 2.5(ti)-2.5 G 2.5(ss)-2.5 G(ubsequently reset.)
-2.5 E F1(SHELLOPTS)108 540 Q F0 3.262(Ac)144 552 S .763
(olon-separated list of enabled shell options.)-3.262 F .763(Each w)
5.763 F .763(ord in the list is a v)-.1 F .763(alid ar)-.25 F .763
(gument for the)-.18 F F1<ad6f>144 564 Q F0 1.174(option to the)3.674 F
F1(set)3.674 E F0 -.2(bu)3.674 G 1.174(iltin command \(see).2 F F2 1.173
(SHELL B)3.673 F(UIL)-.09 E 1.173(TIN COMMANDS)-.828 F F0(belo)3.423 E
3.673(w\). The)-.25 F(options)3.673 E .019(appearing in)144 576 R F2
(SHELLOPTS)2.519 E F0 .019(are those reported as)2.269 F F4(on)2.749 E
F0(by)2.759 E F1 .019(set \255o)2.519 F F0 5.019(.I)C 2.519(ft)-5.019 G
.019(his v)-2.519 F .02(ariable is in the en)-.25 F(vironment)-.4 E
(when)144 588 Q F1(bash)3.142 E F0 .642(starts up, each shell option in\
 the list will be enabled before reading an)3.142 F 3.141(ys)-.15 G .641
(tartup \214les.)-3.141 F(This v)144 600 Q(ariable is read-only)-.25 E
(.)-.65 E F1(SHL)108 612 Q(VL)-.92 E F0
(Incremented by one each time an instance of)144 624 Q F1(bash)2.5 E F0
(is started.)2.5 E F1(SRANDOM)108 636 Q F0 .76(This v)144 648 R .76
(ariable e)-.25 F .761(xpands to a 32-bit pseudo-random number each tim\
e it is referenced. The random)-.15 F .565
(number generator is not linear on systems that support)144 660 R F3
(/dev/urandom)3.064 E F0(or)3.064 E F4(ar)3.064 E(c4r)-.37 E(andom)-.15
E F0 3.064(,s)C 3.064(oe)-3.064 G(ach)-3.064 E .788
(returned number has no relationship to the numbers preceding it.)144
672 R .788(The random number generator)5.788 F .088
(cannot be seeded, so assignments to this v)144 684 R .087(ariable ha)
-.25 F .387 -.15(ve n)-.2 H 2.587(oe).15 G -.25(ff)-2.587 G 2.587
(ect. If).25 F F2(SRANDOM)2.587 E F0 .087(is unset, it loses its)2.337 F
(special properties, e)144 696 Q -.15(ve)-.25 G 2.5(ni).15 G 2.5(fi)-2.5
G 2.5(ti)-2.5 G 2.5(ss)-2.5 G(ubsequently reset.)-2.5 E F1(UID)108 708 Q
F0(Expands to the user ID of the current user)144 708 Q 2.5(,i)-.4 G
(nitialized at shell startup.)-2.5 E(This v)5 E(ariable is readonly)-.25
E(.)-.65 E .993(The follo)108 724.8 R .993(wing v)-.25 F .994
(ariables are used by the shell.)-.25 F .994(In some cases,)5.994 F F1
(bash)3.494 E F0 .994(assigns a def)3.494 F .994(ault v)-.1 F .994
(alue to a v)-.25 F(ariable;)-.25 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(14)190.395 E 0 Cg EP
%%Page: 15 15
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E
(these cases are noted belo)108 84 Q -.65(w.)-.25 G/F1 10/Times-Bold@0
SF -.3(BA)108 100.8 S(SH_COMP).3 E -.95(AT)-.74 G F0 .503(The v)144
112.8 R .502(alue is used to set the shell')-.25 F 3.002(sc)-.55 G .502
(ompatibility le)-3.002 F -.15(ve)-.25 G 3.002(l. See).15 F/F2 9
/Times-Bold@0 SF .502(SHELL COMP)3.002 F -.855(AT)-.666 G .502
(IBILITY MODE).855 F F0(be-)2.752 E(lo)144 124.8 Q 2.662(wf)-.25 G .162
(or a description of the v)-2.662 F .162(arious compatibility le)-.25 F
-.15(ve)-.25 G .162(ls and their ef).15 F 2.663(fects. The)-.25 F -.25
(va)2.663 G .163(lue may be a dec-).25 F .33
(imal number \(e.g., 4.2\) or an inte)144 136.8 R .33
(ger \(e.g., 42\) corresponding to the desired compatibility le)-.15 F
-.15(ve)-.25 G 2.83(l. If).15 F F1 -.3(BA)144 148.8 S(SH_COMP).3 E -.95
(AT)-.74 G F0 .86
(is unset or set to the empty string, the compatibility le)4.31 F -.15
(ve)-.25 G 3.361(li).15 G 3.361(ss)-3.361 G .861(et to the def)-3.361 F
(ault)-.1 E .39(for the current v)144 160.8 R 2.89(ersion. If)-.15 F F1
-.3(BA)2.89 G(SH_COMP).3 E -.95(AT)-.74 G F0 .39(is set to a v)3.84 F
.39(alue that is not one of the v)-.25 F .39(alid compati-)-.25 F .277
(bility le)144 172.8 R -.15(ve)-.25 G .278
(ls, the shell prints an error message and sets the compatibility le).15
F -.15(ve)-.25 G 2.778(lt).15 G 2.778(ot)-2.778 G .278(he def)-2.778 F
.278(ault for the)-.1 F 1.401(current v)144 184.8 R 3.901(ersion. The)
-.15 F -.25(va)3.901 G 1.401(lid v).25 F 1.401
(alues correspond to the compatibility le)-.25 F -.15(ve)-.25 G 1.401
(ls described belo).15 F 3.9(wu)-.25 G(nder)-3.9 E F2(BSHELL)144 196.8 Q
/F3 9/Times-Roman@0 SF(COMP)A -.999(AT)-.828 G(IBILITY).999 E F2(MODE)A
F3(.)A F0 -.15(Fo)4.997 G 2.997(re).15 G .497(xample, 4.2 and 42 are v)
-3.147 F .497(alid v)-.25 F .498(alues that correspond to the)-.25 F F1
.774(compat42 shopt)144 208.8 R F0 .774
(option and set the compatibility le)3.274 F -.15(ve)-.25 G 3.274(lt).15
G 3.274(o4)-3.274 G 3.274(2. The)-3.274 F .774(current v)3.274 F .773
(ersion is also a v)-.15 F(alid)-.25 E -.25(va)144 220.8 S(lue.).25 E F1
-.3(BA)108 232.8 S(SH_ENV).3 E F0 .505(If this parameter is set when)144
244.8 R F1(bash)3.005 E F0 .505(is e)3.005 F -.15(xe)-.15 G .506
(cuting a shell script, its v).15 F .506
(alue is interpreted as a \214lename)-.25 F .391
(containing commands to initialize the shell, as in)144 256.8 R/F4 10
/Times-Italic@0 SF(~/.bashr)2.39 E(c)-.37 E F0 5.39(.T).31 G .39(he v)
-5.39 F .39(alue of)-.25 F F2 -.27(BA)2.89 G(SH_ENV).27 E F0 .39
(is subjected)2.64 F .525(to parameter e)144 268.8 R .525
(xpansion, command substitution, and arithmetic e)-.15 F .525
(xpansion before being interpreted)-.15 F(as a \214lename.)144 280.8 Q
F2 -.666(PA)5 G(TH)-.189 E F0
(is not used to search for the resultant \214lename.)2.25 E F1 -.3(BA)
108 292.8 S(SH_XTRA).3 E(CEFD)-.55 E F0 .481(If set to an inte)144 304.8
R .481(ger corresponding to a v)-.15 F .481(alid \214le descriptor)-.25
F(,)-.4 E F1(bash)2.98 E F0 .48(will write the trace output gener)2.98 F
(-)-.2 E 3.114(ated when)144 316.8 R/F5 10/Courier@0 SF 3.114(set -x)
5.614 F F0 3.114(is enabled to that \214le descriptor)5.614 F 8.114(.T)
-.55 G 3.114(he \214le descriptor is closed when)-8.114 F F2 -.27(BA)144
328.8 S(SH_XTRA).27 E(CEFD)-.495 E F0 .138(is unset or assigned a ne)
2.388 F 2.638(wv)-.25 G 2.638(alue. Unsetting)-2.888 F F2 -.27(BA)2.638
G(SH_XTRA).27 E(CEFD)-.495 E F0 .138(or assigning it)2.388 F 2.531(the \
empty string causes the trace output to be sent to the standard error)
144 340.8 R 7.531(.N)-.55 G 2.531(ote that setting)-7.531 F F2 -.27(BA)
144 352.8 S(SH_XTRA).27 E(CEFD)-.495 E F0 .74(to 2 \(the standard error\
 \214le descriptor\) and then unsetting it will result in the)2.991 F
(standard error being closed.)144 364.8 Q F1(CDP)108 376.8 Q -.95(AT)
-.74 G(H).95 E F0 1.247(The search path for the)144 388.8 R F1(cd)3.747
E F0 3.747(command. This)3.747 F 1.248
(is a colon-separated list of directories in which the)3.747 F 3.796
(shell looks for destination directories speci\214ed by the)144 400.8 R
F1(cd)6.295 E F0 6.295(command. A)6.295 F 3.795(sample v)6.295 F 3.795
(alue is)-.25 F F5(".:~:/usr")144 412.8 Q F0(.)A F1(CHILD_MAX)108 424.8
Q F0 .997(Set the number of e)144 436.8 R .997(xited child status v)-.15
F .997(alues for the shell to remember)-.25 F 5.997(.B)-.55 G .997
(ash will not allo)-5.997 F 3.498(wt)-.25 G(his)-3.498 E -.25(va)144
448.8 S 1.078(lue to be decreased belo).25 F 3.577(waP)-.25 G 1.077
(OSIX-mandated minimum, and there is a maximum v)-3.577 F 1.077
(alue \(cur)-.25 F(-)-.2 E(rently 8192\) that this may not e)144 460.8 Q
2.5(xceed. The)-.15 F(minimum v)2.5 E(alue is system-dependent.)-.25 E
F1(COLUMNS)108 472.8 Q F0 .828(Used by the)144 484.8 R F1(select)3.328 E
F0 .829(compound command to determine the terminal width when printing \
selection)3.328 F 3.466(lists. Automatically)144 496.8 R .966
(set if the)3.466 F F1(checkwinsize)3.466 E F0 .966
(option is enabled or in an interacti)3.466 F 1.266 -.15(ve s)-.25 H
.966(hell upon re-).15 F(ceipt of a)144 508.8 Q F2(SIGWINCH)2.5 E F3(.)A
F1(COMPREPL)108 520.8 Q(Y)-.92 E F0 .847(An array v)144 532.8 R .848
(ariable from which)-.25 F F1(bash)3.348 E F0 .848
(reads the possible completions generated by a shell function)3.348 F
(in)144 544.8 Q -.2(vo)-.4 G -.1(ke).2 G 2.785(db).1 G 2.785(yt)-2.785 G
.285(he programmable completion f)-2.785 F .285(acility \(see)-.1 F F1
(Pr)2.785 E .285(ogrammable Completion)-.18 F F0(belo)2.785 E 2.785
(w\). Each)-.25 F(array element contains one possible completion.)144
556.8 Q F1(EMA)108 568.8 Q(CS)-.55 E F0(If)144 580.8 Q F1(bash)2.535 E
F0 .035(\214nds this v)2.535 F .035(ariable in the en)-.25 F .036
(vironment when the shell starts with v)-.4 F(alue)-.25 E F5(t)2.536 E
F0 2.536(,i)C 2.536(ta)-2.536 G .036(ssumes that the)-2.536 F
(shell is running in an Emacs shell b)144 592.8 Q(uf)-.2 E
(fer and disables line editing.)-.25 E F1(ENV)108 604.8 Q F0 .671
(Expanded and e)144 604.8 R -.15(xe)-.15 G .671(cuted similarly to).15 F
F2 -.27(BA)3.17 G(SH_ENV).27 E F0(\(see)2.92 E F1(INV)3.17 E(OCA)-.45 E
(TION)-.95 E F0(abo)3.17 E -.15(ve)-.15 G 3.17(\)w).15 G .67
(hen an interacti)-3.17 F -.15(ve)-.25 G(shell is in)144 616.8 Q -.2(vo)
-.4 G -.1(ke).2 G 2.5(di).1 G(n)-2.5 E F4(posix mode)2.5 E F0(.)A F1
(EXECIGNORE)108 628.8 Q F0 2.716(Ac)144 640.8 S .216
(olon-separated list of shell patterns \(see)-2.716 F F1 -.1(Pa)2.717 G
(tter).1 E 2.717(nM)-.15 G(atching)-2.717 E F0 2.717(\)d)C .217
(e\214ning the list of \214lenames to be)-2.717 F .117
(ignored by command search using)144 652.8 R F1 -.74(PA)2.617 G(TH)-.21
E F0 5.117(.F)C .116
(iles whose full pathnames match one of these patterns)-5.117 F 1.432
(are not considered e)144 664.8 R -.15(xe)-.15 G 1.432
(cutable \214les for the purposes of completion and command e).15 F -.15
(xe)-.15 G 1.433(cution via).15 F F1 -.74(PA)144 676.8 S(TH)-.21 E F0
2.909(lookup. This)2.909 F .408(does not af)2.908 F .408(fect the beha)
-.25 F .408(vior of the)-.2 F F1([)2.908 E F0(,)A F1(test)2.908 E F0
2.908(,a)C(nd)-2.908 E F1([[)2.908 E F0 2.908(commands. Full)2.908 F
(pathnames)2.908 E .364(in the command hash table are not subject to)144
688.8 R F1(EXECIGNORE)2.864 E F0 5.364(.U)C .364(se this v)-5.364 F .364
(ariable to ignore shared)-.25 F 1.37(library \214les that ha)144 700.8
R 1.67 -.15(ve t)-.2 H 1.37(he e).15 F -.15(xe)-.15 G 1.37
(cutable bit set, b).15 F 1.37(ut are not e)-.2 F -.15(xe)-.15 G 1.37
(cutable \214les.).15 F 1.37(The pattern matching)6.37 F
(honors the setting of the)144 712.8 Q F1(extglob)2.5 E F0
(shell option.)2.5 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(15)
190.395 E 0 Cg EP
%%Page: 16 16
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(FCEDIT)108 84 Q F0(The def)144 96 Q(ault editor for the)-.1 E F1(fc)
2.5 E F0 -.2(bu)2.5 G(iltin command.).2 E F1(FIGNORE)108 108 Q F0 2.598
(Ac)144 120 S .098(olon-separated list of suf)-2.598 F<8c78>-.25 E .098
(es to ignore when performing \214lename completion \(see)-.15 F/F2 9
/Times-Bold@0 SF(READLINE)2.599 E F0(belo)144 132 Q 2.705(w\). A)-.25 F
.205(\214lename whose suf)2.705 F .205
(\214x matches one of the entries in)-.25 F F2(FIGNORE)2.705 E F0 .205
(is e)2.455 F .204(xcluded from the list)-.15 F(of matched \214lenames.)
144 144 Q 2.5(As)5 G(ample v)-2.5 E(alue is)-.25 E/F3 10/Courier@0 SF
(".o:~")2.5 E F0(.)A F1(FUNCNEST)108 156 Q F0 .23(If set to a numeric v)
144 168 R .231
(alue greater than 0, de\214nes a maximum function nesting le)-.25 F
-.15(ve)-.25 G 2.731(l. Function).15 F(in)2.731 E -.2(vo)-.4 G(-).2 E
(cations that e)144 180 Q(xceed this nesting le)-.15 E -.15(ve)-.25 G
2.5(lw).15 G(ill cause the current command to abort.)-2.5 E F1
(GLOBIGNORE)108 192 Q F0 2.924(Ac)144 204 S .423(olon-separated list of\
 patterns de\214ning the set of \214le names to be ignored by pathname \
e)-2.924 F(xpan-)-.15 E 2.947(sion. If)144 216 R 2.947<618c>2.947 G .447
(le name matched by a pathname e)-2.947 F .448
(xpansion pattern also matches one of the patterns in)-.15 F F2
(GLOBIGNORE)144 228 Q/F4 9/Times-Roman@0 SF(,)A F0(it is remo)2.25 E
-.15(ve)-.15 G 2.5(df).15 G(rom the list of matches.)-2.5 E F1
(HISTCONTR)108 240 Q(OL)-.3 E F0 2.654(Ac)144 252 S .153
(olon-separated list of v)-2.654 F .153(alues controlling ho)-.25 F
2.653(wc)-.25 G .153(ommands are sa)-2.653 F -.15(ve)-.2 G 2.653(do).15
G 2.653(nt)-2.653 G .153(he history list.)-2.653 F .153(If the list)
5.153 F .49(of v)144 264 R .49(alues includes)-.25 F/F5 10
/Times-Italic@0 SF(ignor)3 E(espace)-.37 E F0 2.99(,l).18 G .49
(ines which be)-2.99 F .49(gin with a)-.15 F F1(space)2.99 E F0 .49
(character are not sa)2.99 F -.15(ve)-.2 G 2.99(di).15 G 2.99(nt)-2.99 G
.49(he his-)-2.99 F .558(tory list.)144 276 R 3.058(Av)5.558 G .558
(alue of)-3.308 F F5(ignor)3.068 E(edups)-.37 E F0 .558
(causes lines matching the pre)3.328 F .557
(vious history entry to not be sa)-.25 F -.15(ve)-.2 G(d.).15 E 2.925
(Av)144 288 S .425(alue of)-3.175 F F5(ignor)2.935 E(eboth)-.37 E F0
.426(is shorthand for)3.205 F F5(ignor)2.926 E(espace)-.37 E F0(and)
2.926 E F5(ignor)2.926 E(edups)-.37 E F0 5.426(.A)C -.25(va)-2.5 G .426
(lue of).25 F F5(er)3.116 E(asedups)-.15 E F0(causes)3.196 E .699
(all pre)144 300 R .698
(vious lines matching the current line to be remo)-.25 F -.15(ve)-.15 G
3.198(df).15 G .698(rom the history list before that line is)-3.198 F
(sa)144 312 Q -.15(ve)-.2 G 2.763(d. An).15 F 2.763(yv)-.15 G .263
(alue not in the abo)-3.013 F .563 -.15(ve l)-.15 H .263
(ist is ignored.).15 F(If)5.263 E F2(HISTCONTR)2.763 E(OL)-.27 E F0 .264
(is unset, or does not include)2.513 F 2.942(av)144 324 S .442(alid v)
-3.192 F .442(alue, all lines read by the shell parser are sa)-.25 F
-.15(ve)-.2 G 2.941(do).15 G 2.941(nt)-2.941 G .441
(he history list, subject to the v)-2.941 F .441(alue of)-.25 F F2
(HISTIGNORE)144 336 Q F4(.)A F0 1.981(The second and subsequent lines o\
f a multi-line compound command are not)6.481 F
(tested, and are added to the history re)144 348 Q -.05(ga)-.15 G
(rdless of the v).05 E(alue of)-.25 E F2(HISTCONTR)2.5 E(OL)-.27 E F4(.)
A F1(HISTFILE)108 360 Q F0 .181
(The name of the \214le in which command history is sa)144 372 R -.15
(ve)-.2 G 2.681(d\().15 G(see)-2.681 E F2(HIST)2.681 E(OR)-.162 E(Y)
-.315 E F0(belo)2.431 E 2.681(w\). The)-.25 F(def)2.681 E .181(ault v)
-.1 F(alue)-.25 E(is)144 384 Q F5(~/.bash_history)2.5 E F0 5(.I)C 2.5
(fu)-5 G(nset, the command history is not sa)-2.5 E -.15(ve)-.2 G 2.5
(dw).15 G(hen a shell e)-2.5 E(xits.)-.15 E F1(HISTFILESIZE)108 396 Q F0
1.622(The maximum number of lines contained in the history \214le.)144
408 R 1.623(When this v)6.623 F 1.623(ariable is assigned a)-.25 F -.25
(va)144 420 S .125(lue, the history \214le is truncated, if necessary)
.25 F 2.625(,t)-.65 G 2.624(oc)-2.625 G .124
(ontain no more than that number of lines by re-)-2.624 F(mo)144 432 Q
.065(ving the oldest entries.)-.15 F .066(The history \214le is also tr\
uncated to this size after writing it when a shell)5.065 F -.15(ex)144
444 S 2.928(its. If).15 F .428(the v)2.928 F .428
(alue is 0, the history \214le is truncated to zero size.)-.25 F .427
(Non-numeric v)5.427 F .427(alues and numeric)-.25 F -.25(va)144 456 S
.152(lues less than zero inhibit truncation.).25 F .152
(The shell sets the def)5.152 F .152(ault v)-.1 F .152(alue to the v)
-.25 F .152(alue of)-.25 F F1(HISTSIZE)2.652 E F0(after reading an)144
468 Q 2.5(ys)-.15 G(tartup \214les.)-2.5 E F1(HISTIGNORE)108 480 Q F0
2.658(Ac)144 492 S .158(olon-separated list of patterns used to decide \
which command lines should be sa)-2.658 F -.15(ve)-.2 G 2.657(do).15 G
2.657(nt)-2.657 G .157(he his-)-2.657 F .707(tory list.)144 504 R .707
(Each pattern is anchored at the be)5.707 F .708
(ginning of the line and must match the complete line)-.15 F .626
(\(no implicit `)144 516 R F1(*)A F0 3.126('i)C 3.126(sa)-3.126 G 3.126
(ppended\). Each)-3.126 F .626(pattern is tested ag)3.126 F .625
(ainst the line after the checks speci\214ed by)-.05 F F2(HISTCONTR)144
528 Q(OL)-.27 E F0 1.793(are applied.)4.043 F 1.793
(In addition to the normal shell pattern matching characters, `)6.793 F
F1(&)A F0(')A 1.44(matches the pre)144 540 R 1.44(vious history line.)
-.25 F(`)6.44 E F1(&)A F0 3.94('m)C 1.44
(ay be escaped using a backslash; the backslash is re-)-3.94 F(mo)144
552 Q -.15(ve)-.15 G 3.95(db).15 G 1.45(efore attempting a match.)-3.95
F 1.45(The second and subsequent lines of a multi-line compound)6.45 F
1.269(command are not tested, and are added to the history re)144 564 R
-.05(ga)-.15 G 1.269(rdless of the v).05 F 1.269(alue of)-.25 F F2
(HISTIGNORE)3.769 E F4(.)A F0
(The pattern matching honors the setting of the)144 576 Q F1(extglob)2.5
E F0(shell option.)2.5 E F1(HISTSIZE)108 588 Q F0 1.387
(The number of commands to remember in the command history \(see)144 600
R F2(HIST)3.887 E(OR)-.162 E(Y)-.315 E F0(belo)3.637 E 3.887(w\). If)
-.25 F(the)3.888 E -.25(va)144 612 S .413(lue is 0, commands are not sa)
.25 F -.15(ve)-.2 G 2.913(di).15 G 2.913(nt)-2.913 G .413
(he history list.)-2.913 F .413(Numeric v)5.413 F .412
(alues less than zero result in e)-.25 F(v-)-.25 E .343
(ery command being sa)144 624 R -.15(ve)-.2 G 2.843(do).15 G 2.843(nt)
-2.843 G .343(he history list \(there is no limit\).)-2.843 F .344
(The shell sets the def)5.343 F .344(ault v)-.1 F .344(alue to)-.25 F
(500 after reading an)144 636 Q 2.5(ys)-.15 G(tartup \214les.)-2.5 E F1
(HISTTIMEFORMA)108 648 Q(T)-.95 E F0 .952(If this v)144 660 R .952
(ariable is set and not null, its v)-.25 F .951
(alue is used as a format string for)-.25 F F5(strftime)3.451 E F0 .951
(\(3\) to print the)B .672
(time stamp associated with each history entry displayed by the)144 672
R F1(history)3.173 E F0 -.2(bu)3.173 G 3.173(iltin. If).2 F .673(this v)
3.173 F .673(ariable is)-.25 F .144
(set, time stamps are written to the history \214le so the)144 684 R
2.644(ym)-.15 G .144(ay be preserv)-2.644 F .144
(ed across shell sessions.)-.15 F(This)5.144 E(uses the history comment\
 character to distinguish timestamps from other history lines.)144 696 Q
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(16)190.395 E 0 Cg EP
%%Page: 17 17
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(HOME)108 84 Q F0 1.27
(The home directory of the current user; the def)144 96 R 1.27(ault ar)
-.1 F 1.27(gument for the)-.18 F F1(cd)3.77 E F0 -.2(bu)3.77 G 1.27
(iltin command.).2 F(The)6.27 E -.25(va)144 108 S(lue of this v).25 E
(ariable is also used when performing tilde e)-.25 E(xpansion.)-.15 E F1
(HOSTFILE)108 120 Q F0 1.015
(Contains the name of a \214le in the same format as)144 132 R/F2 10
/Times-Italic@0 SF(/etc/hosts)5.181 E F0 1.015
(that should be read when the shell)5.181 F .55
(needs to complete a hostname.)144 144 R .551
(The list of possible hostname completions may be changed while)5.551 F
1.059(the shell is running; the ne)144 156 R 1.059
(xt time hostname completion is attempted after the v)-.15 F 1.058
(alue is changed,)-.25 F F1(bash)144 168 Q F0 .138
(adds the contents of the ne)2.638 F 2.638<778c>-.25 G .138(le to the e)
-2.638 F .138(xisting list.)-.15 F(If)5.138 E/F3 9/Times-Bold@0 SF
(HOSTFILE)2.638 E F0 .138(is set, b)2.388 F .139(ut has no v)-.2 F .139
(alue, or)-.25 F .518(does not name a readable \214le,)144 180 R F1
(bash)3.018 E F0 .518(attempts to read)3.018 F F2(/etc/hosts)4.683 E F0
.517(to obtain the list of possible host-)4.683 F(name completions.)144
192 Q(When)5 E F3(HOSTFILE)2.5 E F0
(is unset, the hostname list is cleared.)2.25 E F1(IFS)108 204 Q F0(The)
144 204 Q F2 .555(Internal F)3.635 F .555(ield Separ)-.45 F(ator)-.15 E
F0 .555(that is used for w)3.785 F .556(ord splitting after e)-.1 F .556
(xpansion and to split lines into)-.15 F -.1(wo)144 216 S(rds with the)
.1 E F1 -.18(re)2.5 G(ad).18 E F0 -.2(bu)2.5 G(iltin command.).2 E
(The def)5 E(ault v)-.1 E(alue is `)-.25 E(`<space><tab><ne)-.74 E
(wline>')-.25 E('.)-.74 E F1(IGNOREEOF)108 228 Q F0 .503
(Controls the action of an interacti)144 240 R .803 -.15(ve s)-.25 H
.503(hell on receipt of an).15 F F3(EOF)3.003 E F0 .503
(character as the sole input.)2.753 F .503(If set,)5.503 F .426(the v)
144 252 R .426(alue is the number of consecuti)-.25 F -.15(ve)-.25 G F3
(EOF)3.076 E F0 .426
(characters which must be typed as the \214rst characters)2.676 F .303
(on an input line before)144 264 R F1(bash)2.802 E F0 -.15(ex)2.802 G
2.802(its. If).15 F .302(the v)2.802 F .302(ariable e)-.25 F .302
(xists b)-.15 F .302(ut does not ha)-.2 F .602 -.15(ve a n)-.2 H .302
(umeric v).15 F .302(alue, or has)-.25 F(no v)144 276 Q(alue, the def)
-.25 E(ault v)-.1 E(alue is 10.)-.25 E(If it does not e)5 E(xist,)-.15 E
F3(EOF)2.5 E F0(signi\214es the end of input to the shell.)2.25 E F1
(INPUTRC)108 288 Q F0 .26(The \214lename for the)144 300 R F1 -.18(re)
2.76 G(adline).18 E F0 .26(startup \214le, o)2.76 F -.15(ve)-.15 G .26
(rriding the def).15 F .261(ault of)-.1 F F2(~/.inputr)4.427 E(c)-.37 E
F0(\(see)4.427 E F3(READLINE)2.761 E F0(be-)2.511 E(lo)144 312 Q(w\).)
-.25 E F1(INSIDE_EMA)108 324 Q(CS)-.55 E F0 .034(If this v)144 336 R
.034(ariable appears in the en)-.25 F .034
(vironment when the shell starts,)-.4 F F1(bash)2.533 E F0 .033
(assumes that it is running in-)2.533 F(side an Emacs shell b)144 348 Q
(uf)-.2 E(fer and may disable line editing, depending on the v)-.25 E
(alue of)-.25 E F1(TERM)2.5 E F0(.)A F1(LANG)108 360 Q F0 1.239
(Used to determine the locale cate)144 360 R 1.239(gory for an)-.15 F
3.739(yc)-.15 G(ate)-3.739 E 1.24
(gory not speci\214cally selected with a v)-.15 F(ariable)-.25 E
(starting with)144 372 Q F1(LC_)2.5 E F0(.)A F1(LC_ALL)108 384 Q F0 .974
(This v)144 396 R .974(ariable o)-.25 F -.15(ve)-.15 G .974
(rrides the v).15 F .973(alue of)-.25 F F3(LANG)3.473 E F0 .973(and an)
3.223 F 3.473(yo)-.15 G(ther)-3.473 E F1(LC_)3.473 E F0 -.25(va)3.473 G
.973(riable specifying a locale cate-).25 F(gory)144 408 Q(.)-.65 E F1
(LC_COLLA)108 420 Q(TE)-.95 E F0 .411(This v)144 432 R .412(ariable det\
ermines the collation order used when sorting the results of pathname e)
-.25 F(xpansion,)-.15 E 1.465(and determines the beha)144 444 R 1.465
(vior of range e)-.2 F 1.464(xpressions, equi)-.15 F -.25(va)-.25 G
1.464(lence classes, and collating sequences).25 F(within pathname e)144
456 Q(xpansion and pattern matching.)-.15 E F1(LC_CTYPE)108 468 Q F0
1.935(This v)144 480 R 1.936
(ariable determines the interpretation of characters and the beha)-.25 F
1.936(vior of character classes)-.2 F(within pathname e)144 492 Q
(xpansion and pattern matching.)-.15 E F1(LC_MESSA)108 504 Q(GES)-.55 E
F0(This v)144 516 Q(ariable determines the locale used to translate dou\
ble-quoted strings preceded by a)-.25 E F1($)2.5 E F0(.)A F1(LC_NUMERIC)
108 528 Q F0(This v)144 540 Q(ariable determines the locale cate)-.25 E
(gory used for number formatting.)-.15 E F1(LC_TIME)108 552 Q F0(This v)
144 564 Q(ariable determines the locale cate)-.25 E
(gory used for data and time formatting.)-.15 E F1(LINES)108 576 Q F0
.055(Used by the)144 576 R F1(select)2.555 E F0 .054(compound command t\
o determine the column length for printing selection lists.)2.555 F .264
(Automatically set if the)144 588 R F1(checkwinsize)2.764 E F0 .264
(option is enabled or in an interacti)2.764 F .565 -.15(ve s)-.25 H .265
(hell upon receipt of a).15 F F3(SIGWINCH)144 600 Q/F4 9/Times-Roman@0
SF(.)A F1(MAIL)108 612 Q F0 .422
(If this parameter is set to a \214le or directory name and the)144 612
R F3(MAILP)2.921 E -.855(AT)-.666 G(H).855 E F0 -.25(va)2.671 G .421
(riable is not set,).25 F F1(bash)2.921 E F0(in-)2.921 E
(forms the user of the arri)144 624 Q -.25(va)-.25 G 2.5(lo).25 G 2.5
(fm)-2.5 G(ail in the speci\214ed \214le or Maildir)-2.5 E
(-format directory)-.2 E(.)-.65 E F1(MAILCHECK)108 636 Q F0 .098
(Speci\214es ho)144 648 R 2.598(wo)-.25 G .098(ften \(in seconds\))
-2.598 F F1(bash)2.598 E F0 .098(checks for mail.)2.598 F .098(The def)
5.098 F .098(ault is 60 seconds.)-.1 F .099(When it is time)5.099 F .224
(to check for mail, the shell does so before displaying the primary pro\
mpt.)144 660 R .223(If this v)5.223 F .223(ariable is unset,)-.25 F
(or set to a v)144 672 Q(alue that is not a number greater than or equa\
l to zero, the shell disables mail checking.)-.25 E F1(MAILP)108 684 Q
-.95(AT)-.74 G(H).95 E F0 2.99(Ac)144 696 S .49
(olon-separated list of \214lenames to be check)-2.99 F .49
(ed for mail.)-.1 F .49(The message to be printed when mail)5.49 F(arri)
144 708 Q -.15(ve)-.25 G 2.62(si).15 G 2.62(nap)-2.62 G .12(articular \
\214le may be speci\214ed by separating the \214lename from the message\
 with a `?'.)-2.62 F(When used in the te)144 720 Q(xt of the message,)
-.15 E F1($_)2.5 E F0 -.15(ex)2.5 G
(pands to the name of the current mail\214le.).15 E(Example:)5 E
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(17)190.395 E 0 Cg EP
%%Page: 18 18
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(MAILP)144 84 Q -.95(AT)-.74 G(H).95 E F0(=\010/v)A(ar/mail/bfox?"Y)
-.25 E(ou ha)-1.1 E .3 -.15(ve m)-.2 H
(ail":~/shell\255mail?"$_ has mail!"\010).15 E F1(Bash)144 96 Q F0 .015
(can be con\214gured to supply a def)2.515 F .015(ault v)-.1 F .015
(alue for this v)-.25 F .015(ariable \(there is no v)-.25 F .015
(alue by def)-.25 F .015(ault\), b)-.1 F(ut)-.2 E(the location of the u\
ser mail \214les that it uses is system dependent \(e.g., /v)144 108 Q
(ar/mail/)-.25 E F1($USER)A F0(\).)A F1(OPTERR)108 120 Q F0 .39
(If set to the v)144 132 R .39(alue 1,)-.25 F F1(bash)2.89 E F0 .389
(displays error messages generated by the)2.889 F F1(getopts)2.889 E F0
-.2(bu)2.889 G .389(iltin command \(see).2 F/F2 9/Times-Bold@0 SF .359
(SHELL B)144 144 R(UIL)-.09 E .359(TIN COMMANDS)-.828 F F0(belo)2.609 E
(w\).)-.25 E F2(OPTERR)5.359 E F0 .36
(is initialized to 1 each time the shell is in)2.609 F -.2(vo)-.4 G -.1
(ke).2 G(d).1 E(or a shell script is e)144 156 Q -.15(xe)-.15 G(cuted.)
.15 E F1 -.74(PA)108 168 S(TH)-.21 E F0 .588
(The search path for commands.)144 168 R .587
(It is a colon-separated list of directories in which the shell looks)
5.588 F .471(for commands \(see)144 180 R F2 .471(COMMAND EXECUTION)
2.971 F F0(belo)2.722 E 2.972(w\). A)-.25 F .472
(zero-length \(null\) directory name in the)2.972 F -.25(va)144 192 S
.536(lue of).25 F F2 -.666(PA)3.036 G(TH)-.189 E F0 .535
(indicates the current directory)2.786 F 5.535(.A)-.65 G .535
(null directory name may appear as tw)-2.5 F 3.035(oa)-.1 G(djacent)
-3.035 E .867(colons, or as an initial or trailing colon.)144 204 R .868
(The def)5.868 F .868(ault path is system-dependent, and is set by the)
-.1 F(administrator who installs)144 216 Q F1(bash)2.5 E F0 5(.A)C
(common v)-2.5 E(alue is)-.25 E/F3 10/Courier@0 SF
(/usr/local/bin:/usr/lo-)2.5 E(cal/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
144 228 Q F0(.)A F1(POSIXL)108 240 Q(Y_CORRECT)-.92 E F0 .471(If this v)
144 252 R .471(ariable is in the en)-.25 F .471(vironment when)-.4 F F1
(bash)2.971 E F0 .471(starts, the shell enters)2.971 F/F4 10
/Times-Italic@0 SF .472(posix mode)2.972 F F0 .472(before reading)2.972
F .011(the startup \214les, as if the)144 264 R F1(\255\255posix)2.511 E
F0(in)2.511 E -.2(vo)-.4 G .011(cation option had been supplied.).2 F
.011(If it is set while the shell is)5.011 F(running,)144 276 Q F1(bash)
4.497 E F0(enables)4.497 E F4 1.997(posix mode)4.497 F F0 4.497(,a)C
4.497(si)-4.497 G 4.497(ft)-4.497 G 1.997(he command)-4.497 F F3 1.997
(set -o posix)4.497 F F0 1.998(had been e)4.497 F -.15(xe)-.15 G(cuted.)
.15 E(When the shell enters)144 288 Q F4(posix mode)2.5 E F0 2.5(,i)C
2.5(ts)-2.5 G(ets this v)-2.5 E(ariable if it w)-.25 E
(as not already set.)-.1 E F1(PR)108 300 Q(OMPT_COMMAND)-.3 E F0 .155
(If this v)144 312 R .155(ariable is set, and is an array)-.25 F 2.655
(,t)-.65 G .155(he v)-2.655 F .155(alue of each set element is e)-.25 F
-.15(xe)-.15 G .155(cuted as a command prior).15 F .407
(to issuing each primary prompt.)144 324 R .407(If this is set b)5.407 F
.407(ut not an array v)-.2 F .407(ariable, its v)-.25 F .407
(alue is used as a com-)-.25 F(mand to e)144 336 Q -.15(xe)-.15 G
(cute instead.).15 E F1(PR)108 348 Q(OMPT_DIR)-.3 E(TRIM)-.4 E F0 .676
(If set to a number greater than zero, the v)144 360 R .676
(alue is used as the number of trailing directory compo-)-.25 F .923
(nents to retain when e)144 372 R .923(xpanding the)-.15 F F1(\\w)3.423
E F0(and)3.423 E F1(\\W)3.423 E F0 .923(prompt string escapes \(see)
3.423 F F2(PR)3.423 E(OMPTING)-.27 E F0(belo)3.173 E(w\).)-.25 E
(Characters remo)144 384 Q -.15(ve)-.15 G 2.5(da).15 G
(re replaced with an ellipsis.)-2.5 E F1(PS0)108 396 Q F0 1.174(The v)
144 396 R 1.174(alue of this parameter is e)-.25 F 1.174(xpanded \(see)
-.15 F F2(PR)3.674 E(OMPTING)-.27 E F0(belo)3.424 E 1.174
(w\) and displayed by interacti)-.25 F -.15(ve)-.25 G
(shells after reading a command and before the command is e)144 408 Q
-.15(xe)-.15 G(cuted.).15 E F1(PS1)108 420 Q F0 .064(The v)144 420 R
.065(alue of this parameter is e)-.25 F .065(xpanded \(see)-.15 F F2(PR)
2.565 E(OMPTING)-.27 E F0(belo)2.315 E .065
(w\) and used as the primary prompt)-.25 F 2.5(string. The)144 432 R
(def)2.5 E(ault v)-.1 E(alue is `)-.25 E(`)-.74 E F1(\\s\255\\v\\$)A F0
-.74('')2.5 G(.).74 E F1(PS2)108 444 Q F0 .118(The v)144 444 R .118
(alue of this parameter is e)-.25 F .118(xpanded as with)-.15 F F2(PS1)
2.617 E F0 .117(and used as the secondary prompt string.)2.367 F(The)
5.117 E(def)144 456 Q(ault is `)-.1 E(`)-.74 E F1(>)A F0 -.74('')2.5 G
(.).74 E F1(PS3)108 468 Q F0 1.115(The v)144 468 R 1.115
(alue of this parameter is used as the prompt for the)-.25 F F1(select)
3.615 E F0 1.116(command \(see)3.616 F F2 1.116(SHELL GRAM-)3.616 F(MAR)
144 480 Q F0(abo)2.25 E -.15(ve)-.15 G(\).).15 E F1(PS4)108 492 Q F0
.101(The v)144 492 R .101(alue of this parameter is e)-.25 F .101
(xpanded as with)-.15 F F2(PS1)2.6 E F0 .1(and the v)2.35 F .1
(alue is printed before each command)-.25 F F1(bash)144 504 Q F0 .334
(displays during an e)2.834 F -.15(xe)-.15 G .335(cution trace.).15 F
.335(The \214rst character of the e)5.335 F .335(xpanded v)-.15 F .335
(alue of)-.25 F F2(PS4)2.835 E F0 .335(is repli-)2.585 F
(cated multiple times, as necessary)144 516 Q 2.5(,t)-.65 G 2.5(oi)-2.5
G(ndicate multiple le)-2.5 E -.15(ve)-.25 G(ls of indirection.).15 E
(The def)5 E(ault is `)-.1 E(`)-.74 E F1(+)A F0 -.74('')2.5 G(.).74 E F1
(SHELL)108 528 Q F0 .543(This v)144 540 R .543(ariable e)-.25 F .543
(xpands to the full pathname to the shell.)-.15 F .542
(If it is not set when the shell starts,)5.543 F F1(bash)3.042 E F0
(assigns to it the full pathname of the current user')144 552 Q 2.5(sl)
-.55 G(ogin shell.)-2.5 E F1(TIMEFORMA)108 564 Q(T)-.95 E F0 .826(The v)
144 576 R .826
(alue of this parameter is used as a format string specifying ho)-.25 F
3.327(wt)-.25 G .827(he timing information for)-3.327 F .649
(pipelines pre\214x)144 588 R .649(ed with the)-.15 F F1(time)3.149 E F0
(reserv)3.149 E .649(ed w)-.15 F .648(ord should be displayed.)-.1 F
(The)5.648 E F1(%)3.148 E F0 .648(character introduces)3.148 F .711
(an escape sequence that is e)144 600 R .711(xpanded to a time v)-.15 F
.712(alue or other information.)-.25 F .712(The escape sequences)5.712 F
(and their meanings are as follo)144 612 Q
(ws; the braces denote optional portions.)-.25 E F1(%%)144 630 Q F0 2.5
(Al)194 630 S(iteral)-2.5 E F1(%)2.5 E F0(.)A F1(%[)144 642 Q F4(p)A F1
(][l]R)A F0(The elapsed time in seconds.)194 642 Q F1(%[)144 654 Q F4(p)
A F1(][l]U)A F0(The number of CPU seconds spent in user mode.)194 654 Q
F1(%[)144 666 Q F4(p)A F1(][l]S)A F0
(The number of CPU seconds spent in system mode.)194 666 Q F1(%P)144 678
Q F0(The CPU percentage, computed as \(%U + %S\) / %R.)194 678 Q .87
(The optional)144 694.8 R F4(p)3.37 E F0 .87(is a digit specifying the)
3.37 F F4(pr)3.37 E(ecision)-.37 E F0 3.37(,t)C .87
(he number of fractional digits after a decimal)-3.37 F 2.525(point. A)
144 706.8 R -.25(va)2.525 G .025
(lue of 0 causes no decimal point or fraction to be output.).25 F .026
(At most three places after the)5.025 F .538
(decimal point may be speci\214ed; v)144 718.8 R .538(alues of)-.25 F F4
(p)3.038 E F0 .537(greater than 3 are changed to 3.)3.037 F(If)5.537 E
F4(p)3.037 E F0 .537(is not speci\214ed,)3.037 F(the v)144 730.8 Q
(alue 3 is used.)-.25 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E
(18)190.395 E 0 Cg EP
%%Page: 19 19
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .667(The optional)
144 84 R/F1 10/Times-Bold@0 SF(l)3.167 E F0 .668
(speci\214es a longer format, including minutes, of the form)3.168 F/F2
10/Times-Italic@0 SF(MM)3.168 E F0(m)A F2(SS)A F0(.)A F2(FF)A F0 3.168
(s. The)B -.25(va)3.168 G(lue).25 E(of)144 96 Q F2(p)2.5 E F0
(determines whether or not the fraction is included.)2.5 E 13.365
(If this v)144 112.8 R 13.365(ariable is not set,)-.25 F F1(bash)15.865
E F0 13.364(acts as if it had the v)15.865 F(alue)-.25 E F1($\010\\nr)
144 124.8 Q(eal\\t%3lR\\nuser\\t%3lU\\nsys\\t%3lS\010)-.18 E F0 7.113
(.I)C 4.613(ft)-7.113 G 2.113(he v)-4.613 F 2.113
(alue is null, no timing information is dis-)-.25 F 2.5(played. A)144
136.8 R(trailing ne)2.5 E
(wline is added when the format string is displayed.)-.25 E F1(TMOUT)108
148.8 Q F0 .941(If set to a v)144 160.8 R .941(alue greater than zero,)
-.25 F/F3 9/Times-Bold@0 SF(TMOUT)3.441 E F0 .941(is treated as the def)
3.191 F .941(ault timeout for the)-.1 F F1 -.18(re)3.441 G(ad).18 E F0
-.2(bu)3.441 G(iltin.).2 E(The)144 172.8 Q F1(select)2.81 E F0 .31
(command terminates if input does not arri)2.81 F .611 -.15(ve a)-.25 H
(fter).15 E F3(TMOUT)2.811 E F0 .311(seconds when input is com-)2.561 F
.886(ing from a terminal.)144 184.8 R .886(In an interacti)5.886 F 1.185
-.15(ve s)-.25 H .885(hell, the v).15 F .885
(alue is interpreted as the number of seconds to)-.25 F -.1(wa)144 196.8
S 1.05(it for a line of input after issuing the primary prompt.).1 F F1
(Bash)6.05 E F0 1.05(terminates after w)3.55 F 1.05(aiting for that)-.1
F(number of seconds if a complete line of input does not arri)144 208.8
Q -.15(ve)-.25 G(.).15 E F1(TMPDIR)108 220.8 Q F0 .391(If set,)144 232.8
R F1(bash)2.891 E F0 .391(uses its v)2.891 F .391
(alue as the name of a directory in which)-.25 F F1(bash)2.89 E F0 .39
(creates temporary \214les for the)2.89 F(shell')144 244.8 Q 2.5(su)-.55
G(se.)-2.5 E F1(auto_r)108 256.8 Q(esume)-.18 E F0 .53(This v)144 268.8
R .53(ariable controls ho)-.25 F 3.03(wt)-.25 G .531
(he shell interacts with the user and job control.)-3.03 F .531
(If this v)5.531 F .531(ariable is set,)-.25 F .539(single w)144 280.8 R
.538(ord simple commands without redirections are treated as candidates\
 for resumption of an)-.1 F -.15(ex)144 292.8 S .366(isting stopped job)
.15 F 5.366(.T)-.4 G .366(here is no ambiguity allo)-5.366 F .366
(wed; if there is more than one job be)-.25 F .367(ginning with)-.15 F
1.125(the string typed, the job most recently accessed is selected.)144
304.8 R(The)6.125 E F2(name)3.985 E F0 1.124(of a stopped job, in this)
3.805 F(conte)144 316.8 Q 1.132
(xt, is the command line used to start it.)-.15 F 1.133(If set to the v)
6.133 F(alue)-.25 E F2 -.2(ex)3.633 G(act).2 E F0 3.633(,t).68 G 1.133
(he string supplied must)-3.633 F .606
(match the name of a stopped job e)144 328.8 R .606(xactly; if set to)
-.15 F F2(substring)3.445 E F0 3.105(,t).22 G .605
(he string supplied needs to match a)-3.105 F .884
(substring of the name of a stopped job)144 340.8 R 5.884(.T)-.4 G(he)
-5.884 E F2(substring)3.724 E F0 -.25(va)3.604 G .885(lue pro).25 F .885
(vides functionality analogous to)-.15 F(the)144 352.8 Q F1(%?)3.334 E
F0 .834(job identi\214er \(see)5.834 F F3 .834(JOB CONTR)3.334 F(OL)-.27
E F0(belo)3.084 E 3.334(w\). If)-.25 F .834(set to an)3.334 F 3.334(yo)
-.15 G .834(ther v)-3.334 F .833(alue, the supplied string)-.25 F .315
(must be a pre\214x of a stopped job')144 364.8 R 2.816(sn)-.55 G .316
(ame; this pro)-2.816 F .316(vides functionality analogous to the)-.15 F
F1(%)2.816 E F2(string)A F0(job)2.816 E(identi\214er)144 376.8 Q(.)-.55
E F1(histchars)108 388.8 Q F0 .546(The tw)144 400.8 R 3.046(oo)-.1 G
3.046(rt)-3.046 G .546(hree characters which control history e)-3.046 F
.545(xpansion and tok)-.15 F .545(enization \(see)-.1 F F3(HIST)3.045 E
(OR)-.162 E 2.795(YE)-.315 G(X-)-2.795 E -.666(PA)144 412.8 S(NSION).666
E F0(belo)2.987 E 3.237(w\). The)-.25 F .737(\214rst character is the)
3.237 F F2 .737(history e)3.237 F(xpansion)-.2 E F0(character)3.238 E
3.238(,t)-.4 G .738(he character which sig-)-3.238 F .761
(nals the start of a history e)144 424.8 R .761(xpansion, normally `)
-.15 F F1(!)A F0 3.261('. The)B .76(second character is the)3.261 F F2
(quic)3.26 E 3.26(ks)-.2 G(ubstitution)-3.26 E F0(character)144 436.8 Q
3.476(,w)-.4 G .977(hich is used as shorthand for re-running the pre)
-3.476 F .977(vious command entered, substituting)-.25 F .131
(one string for another in the command.)144 448.8 R .131(The def)5.131 F
.131(ault is `)-.1 F F1(^)A F0 2.63('. The)B .13
(optional third character is the char)2.63 F(-)-.2 E .276(acter which i\
ndicates that the remainder of the line is a comment when found as the \
\214rst character)144 460.8 R .46(of a w)144 472.8 R .46
(ord, normally `)-.1 F F1(#)A F0 2.959('. The)B .459
(history comment character causes history substitution to be skipped)
2.959 F .466(for the remaining w)144 484.8 R .466(ords on the line.)-.1
F .467(It does not necessarily cause the shell parser to treat the rest)
5.467 F(of the line as a comment.)144 496.8 Q F1(Arrays)87 513.6 Q(Bash)
108 525.6 Q F0(pro)3.391 E .891(vides one-dimensional inde)-.15 F -.15
(xe)-.15 G 3.391(da).15 G .891(nd associati)-3.391 F 1.191 -.15(ve a)
-.25 H .891(rray v).15 F 3.391(ariables. An)-.25 F 3.391(yv)-.15 G .89
(ariable may be used as an)-3.641 F(inde)108 537.6 Q -.15(xe)-.15 G
2.573(da).15 G .073(rray; the)-2.573 F F1(declar)2.573 E(e)-.18 E F0 -.2
(bu)2.573 G .073(iltin will e).2 F .073(xplicitly declare an array)-.15
F 5.073(.T)-.65 G .074(here is no maximum limit on the size of)-5.073 F
.329(an array)108 549.6 R 2.829(,n)-.65 G .329(or an)-2.829 F 2.829(yr)
-.15 G .329(equirement that members be inde)-2.829 F -.15(xe)-.15 G
2.829(do).15 G 2.829(ra)-2.829 G .328(ssigned contiguously)-2.829 F
5.328(.I)-.65 G(nde)-5.328 E -.15(xe)-.15 G 2.828(da).15 G .328
(rrays are refer)-2.828 F(-)-.2 E 1.595(enced using inte)108 561.6 R
1.595(gers \(including arithmetic e)-.15 F 1.595
(xpressions\) and are zero-based; associati)-.15 F 1.895 -.15(ve a)-.25
H 1.595(rrays are refer).15 F(-)-.2 E(enced using arbitrary strings.)108
573.6 Q(Unless otherwise noted, inde)5 E -.15(xe)-.15 G 2.5(da).15 G
(rray indices must be non-ne)-2.5 E -.05(ga)-.15 G(ti).05 E .3 -.15
(ve i)-.25 H(nte).15 E(gers.)-.15 E 2.463(An inde)108 590.4 R -.15(xe)
-.15 G 4.963(da).15 G 2.463(rray is created automatically if an)-4.963 F
4.963(yv)-.15 G 2.462(ariable is assigned to using the syntax)-5.213 F
F2(name)4.962 E F0([)A F2(sub-)A(script)108 602.4 Q F0(]=)A F2(value)A
F0 5.506(.T)C(he)-5.506 E F2(subscript)3.346 E F0 .507
(is treated as an arithmetic e)3.687 F .507(xpression that must e)-.15 F
-.25(va)-.25 G .507(luate to a number).25 F 5.507(.T)-.55 G 3.007(oe)
-6.307 G(x-)-3.157 E 1.193(plicitly declare an inde)108 614.4 R -.15(xe)
-.15 G 3.693(da).15 G(rray)-3.693 E 3.693(,u)-.65 G(se)-3.693 E F1
(declar)3.693 E 3.693<65ad>-.18 G(a)-3.693 E F2(name)3.693 E F0(\(see)
3.692 E F3 1.192(SHELL B)3.692 F(UIL)-.09 E 1.192(TIN COMMANDS)-.828 F
F0(belo)3.442 E(w\).)-.25 E F1(de-)6.192 E(clar)108 626.4 Q 2.5<65ad>
-.18 G(a)-2.5 E F2(name)2.5 E F1([)A F2(subscript)A F1(])A F0
(is also accepted; the)2.5 E F2(subscript)2.5 E F0(is ignored.)2.5 E
(Associati)108 643.2 Q .3 -.15(ve a)-.25 H(rrays are created using).15 E
F1(declar)2.5 E 2.5<65ad>-.18 G(A)-2.5 E F2(name)2.5 E F0(.)A(Attrib)108
660 Q .94(utes may be speci\214ed for an array v)-.2 F .941
(ariable using the)-.25 F F1(declar)3.441 E(e)-.18 E F0(and)3.441 E F1
-.18(re)3.441 G(adonly).18 E F0 -.2(bu)3.441 G 3.441(iltins. Each).2 F
(attrib)3.441 E(ute)-.2 E(applies to all members of an array)108 672 Q
(.)-.65 E 1.647
(Arrays are assigned to using compound assignments of the form)108 688.8
R F2(name)4.147 E F0(=)A F1(\()A F0 -.25(va)C(lue).25 E F2(1)A F0 1.647
(... v)4.147 F(alue)-.25 E F2(n)A F1(\))A F0 4.147(,w)C 1.647(here each)
-4.147 F F2(value)108 700.8 Q F0 .211(may be of the form [)2.711 F F2
(subscript)A F0(]=)A F2(string)A F0 5.211(.I)C(nde)-5.211 E -.15(xe)-.15
G 2.711(da).15 G .212(rray assignments do not require an)-2.711 F .212
(ything b)-.15 F(ut)-.2 E F2(string)2.712 E F0(.)A(Each)108 712.8 Q F2
(value)2.53 E F0 .029(in the list is e)2.529 F .029
(xpanded using all the shell e)-.15 F .029(xpansions described belo)-.15
F 2.529(wu)-.25 G(nder)-2.529 E F3(EXP)2.529 E(ANSION)-.666 E/F4 9
/Times-Roman@0 SF(.)A F0(When)4.529 E .995(assigning to inde)108 724.8 R
-.15(xe)-.15 G 3.495(da).15 G .995(rrays, if the optional brack)-3.495 F
.996(ets and subscript are supplied, that inde)-.1 F 3.496(xi)-.15 G
3.496(sa)-3.496 G .996(ssigned to;)-3.496 F(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(19)190.395 E 0 Cg EP
%%Page: 20 20
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .417
(otherwise the inde)108 84 R 2.917(xo)-.15 G 2.917(ft)-2.917 G .417
(he element assigned is the last inde)-2.917 F 2.917(xa)-.15 G .416
(ssigned to by the statement plus one.)-2.917 F(Inde)5.416 E(x-)-.15 E
(ing starts at zero.)108 96 Q 1.288(When assigning to an associati)108
112.8 R 1.588 -.15(ve a)-.25 H(rray).15 E 3.788(,t)-.65 G 1.288(he w)
-3.788 F 1.288(ords in a compound assignment may be either assignment)
-.1 F .608
(statements, for which the subscript is required, or a list of w)108
124.8 R .608(ords that is interpreted as a sequence of alter)-.1 F(-)-.2
E 1.956(nating k)108 136.8 R -.15(ey)-.1 G 4.456(sa).15 G 1.956(nd v)
-4.456 F(alues:)-.25 E/F1 10/Times-Italic@0 SF(name)4.456 E F0(=)A/F2 10
/Times-Bold@0 SF(\()A F1 -.1(ke)4.456 G 1.957(y1 value1 k)-.2 F -.3(ey)
-.1 G 4.457(2v).3 G(alue2)-4.457 E F0(...)4.457 E F2(\))A F0 6.957(.T)C
1.957(hese are treated identically to)-6.957 F F1(name)4.457 E F0(=)A F2
(\()A F0([)108 148.8 Q F1 -.1(ke)C(y1)-.2 E F0(]=)A F1(value1)A F0([)
3.133 E F1 -.1(ke)C(y2)-.2 E F0(]=)A F1(value2)A F0(...)3.133 E F2(\))A
F0 5.633(.T)C .633(he \214rst w)-5.633 F .633
(ord in the list determines ho)-.1 F 3.132(wt)-.25 G .632
(he remaining w)-3.132 F .632(ords are inter)-.1 F(-)-.2 E .153
(preted; all assignments in a list must be of the same type.)108 160.8 R
.154(When using k)5.154 F -.15(ey)-.1 G(/v).15 E .154(alue pairs, the k)
-.25 F -.15(ey)-.1 G 2.654(sm).15 G .154(ay not be)-2.654 F
(missing or empty; a \214nal missing v)108 172.8 Q(alue is treated lik)
-.25 E 2.5(et)-.1 G(he empty string.)-2.5 E .24
(This syntax is also accepted by the)108 189.6 R F2(declar)2.74 E(e)-.18
E F0 -.2(bu)2.739 G 2.739(iltin. Indi).2 F .239
(vidual array elements may be assigned to using the)-.25 F F1(name)108
201.6 Q F0([)A F1(subscript)A F0(]=)A F1(value)A F0 1.917
(syntax introduced abo)4.416 F -.15(ve)-.15 G 6.917(.W).15 G 1.917
(hen assigning to an inde)-6.917 F -.15(xe)-.15 G 4.417(da).15 G(rray)
-4.417 E 4.417(,i)-.65 G(f)-4.417 E F1(name)4.777 E F0 1.917(is sub-)
4.597 F .116(scripted by a ne)108 213.6 R -.05(ga)-.15 G(ti).05 E .416
-.15(ve n)-.25 H(umber).15 E 2.616(,t)-.4 G .115
(hat number is interpreted as relati)-2.616 F .415 -.15(ve t)-.25 H
2.615(oo).15 G .115(ne greater than the maximum inde)-2.615 F(x)-.15 E
(of)108 225.6 Q F1(name)2.676 E F0 2.676(,s)C 2.676(on)-2.676 G -2.25
-.15(eg a)-2.676 H(ti).15 E .476 -.15(ve i)-.25 H .177
(ndices count back from the end of the array).15 F 2.677(,a)-.65 G .177
(nd an inde)-2.677 F 2.677(xo)-.15 G 2.677<66ad>-2.677 G 2.677(1r)-2.677
G .177(eferences the last el-)-2.677 F(ement.)108 237.6 Q(An)108 254.4 Q
3.576(ye)-.15 G 1.076(lement of an array may be referenced using ${)
-3.576 F F1(name)A F0([)A F1(subscript)A F0 3.575(]}. The)B 1.075
(braces are required to a)3.575 F -.2(vo)-.2 G(id).2 E 1.541
(con\215icts with pathname e)108 266.4 R 4.041(xpansion. If)-.15 F F1
(subscript)4.041 E F0(is)4.041 E F2(@)4.041 E F0(or)4.041 E F2(*)4.041 E
F0 4.041(,t)C 1.541(he w)-4.041 F 1.541(ord e)-.1 F 1.541
(xpands to all members of)-.15 F F1(name)4.042 E F0(.)A 1.057
(These subscripts dif)108 278.4 R 1.057(fer only when the w)-.25 F 1.057
(ord appears within double quotes.)-.1 F 1.056(If the w)6.056 F 1.056
(ord is double-quoted,)-.1 F(${)108 290.4 Q F1(name)A F0 .52([*]} e)B
.52(xpands to a single w)-.15 F .52(ord with the v)-.1 F .521
(alue of each array member separated by the \214rst character)-.25 F
1.375(of the)108 302.4 R/F3 9/Times-Bold@0 SF(IFS)3.875 E F0 1.375
(special v)3.625 F 1.375(ariable, and ${)-.25 F F1(name)A F0 1.375
([@]} e)B 1.375(xpands each element of)-.15 F F1(name)3.875 E F0 1.374
(to a separate w)3.875 F 3.874(ord. When)-.1 F 2.027
(there are no array members, ${)108 314.4 R F1(name)A F0 2.028([@]} e)B
2.028(xpands to nothing.)-.15 F 2.028(If the double-quoted e)7.028 F
2.028(xpansion occurs)-.15 F .759(within a w)108 326.4 R .759
(ord, the e)-.1 F .759
(xpansion of the \214rst parameter is joined with the be)-.15 F .759
(ginning part of the original w)-.15 F(ord,)-.1 E .515(and the e)108
338.4 R .516(xpansion of the last parameter is joined with the last par\
t of the original w)-.15 F 3.016(ord. This)-.1 F .516(is analogous)3.016
F .228(to the e)108 350.4 R .228(xpansion of the special parameters)-.15
F F2(*)2.728 E F0(and)2.728 E F2(@)2.728 E F0(\(see)2.728 E F2 .228
(Special P)2.728 F(arameters)-.1 E F0(abo)2.727 E -.15(ve)-.15 G 2.727
(\). ${#).15 F F1(name)A F0([)A F1(subscript)A F0(]})A -.15(ex)108 362.4
S .886(pands to the length of ${).15 F F1(name)A F0([)A F1(subscript)A
F0 3.386(]}. If)B F1(subscript)3.386 E F0(is)3.386 E F2(*)3.386 E F0(or)
3.386 E F2(@)3.386 E F0 3.386(,t)C .886(he e)-3.386 F .886
(xpansion is the number of ele-)-.15 F .295(ments in the array)108 374.4
R 5.295(.I)-.65 G 2.795(ft)-5.295 G(he)-2.795 E F1(subscript)3.135 E F0
.295(used to reference an element of an inde)3.475 F -.15(xe)-.15 G
2.794(da).15 G .294(rray e)-2.794 F -.25(va)-.25 G .294
(luates to a number).25 F .628
(less than zero, it is interpreted as relati)108 386.4 R .928 -.15(ve t)
-.25 H 3.128(oo).15 G .629(ne greater than the maximum inde)-3.128 F
3.129(xo)-.15 G 3.129(ft)-3.129 G .629(he array)-3.129 F 3.129(,s)-.65 G
3.129(on)-3.129 G -2.25 -.15(eg a)-3.129 H(ti).15 E -.15(ve)-.25 G
(indices count back from the end of the array)108 398.4 Q 2.5(,a)-.65 G
(nd an inde)-2.5 E 2.5(xo)-.15 G 2.5<66ad>-2.5 G 2.5(1r)-2.5 G
(eferences the last element.)-2.5 E .595(Referencing an array v)108
415.2 R .595(ariable without a subscript is equi)-.25 F -.25(va)-.25 G
.595(lent to referencing the array with a subscript of).25 F 2.5(0. An)
108 427.2 R 2.5(yr)-.15 G(eference to a v)-2.5 E(ariable using a v)-.25
E(alid subscript is le)-.25 E -.05(ga)-.15 G(l, and).05 E F2(bash)2.5 E
F0(will create an array if necessary)2.5 E(.)-.65 E(An array v)108 444 Q
(ariable is considered set if a subscript has been assigned a v)-.25 E
2.5(alue. The)-.25 F(null string is a v)2.5 E(alid v)-.25 E(alue.)-.25 E
.417(It is possible to obtain the k)108 460.8 R -.15(ey)-.1 G 2.918(s\()
.15 G .418(indices\) of an array as well as the v)-2.918 F 2.918
(alues. ${)-.25 F F2(!)A F1(name)A F0([)A F1(@)A F0 .418(]} and ${)B F2
(!)A F1(name)A F0([)A F1(*)A F0(]})A -.15(ex)108 472.8 S .75
(pand to the indices assigned in array v).15 F(ariable)-.25 E F1(name)
3.249 E F0 5.749(.T)C .749
(he treatment when in double quotes is similar to)-5.749 F(the e)108
484.8 Q(xpansion of the special parameters)-.15 E F1(@)2.5 E F0(and)2.5
E F1(*)2.5 E F0(within double quotes.)2.5 E(The)108 501.6 Q F2(unset)
2.766 E F0 -.2(bu)2.766 G .267(iltin is used to destro).2 F 2.767(ya)-.1
G(rrays.)-2.767 E F2(unset)5.267 E F1(name)2.767 E F0([)A F1(subscript)A
F0 2.767(]d)C(estro)-2.767 E .267(ys the array element at inde)-.1 F(x)
-.15 E F1(sub-)2.767 E(script)108 513.6 Q F0 2.858(,f)C .358
(or both inde)-2.858 F -.15(xe)-.15 G 2.858(da).15 G .358(nd associati)
-2.858 F .658 -.15(ve a)-.25 H 2.858(rrays. Ne).15 F -.05(ga)-.15 G(ti)
.05 E .658 -.15(ve s)-.25 H .358(ubscripts to inde).15 F -.15(xe)-.15 G
2.858(da).15 G .358(rrays are interpreted as de-)-2.858 F 1.204
(scribed abo)108 525.6 R -.15(ve)-.15 G 6.204(.U).15 G 1.204
(nsetting the last element of an array v)-6.204 F 1.205
(ariable does not unset the v)-.25 F(ariable.)-.25 E F2(unset)6.205 E F1
(name)3.705 E F0(,)A(where)108 537.6 Q F1(name)2.5 E F0(is an array)2.5
E 2.5(,o)-.65 G(r)-2.5 E F2(unset)2.5 E F1(name)2.5 E F0([)A F1
(subscript)A F0(], where)A F1(subscript)2.5 E F0(is)2.5 E F2(*)2.5 E F0
(or)2.5 E F2(@)2.5 E F0 2.5(,r)C(emo)-2.5 E -.15(ve)-.15 G 2.5(st).15 G
(he entire array)-2.5 E(.)-.65 E .029(When using a v)108 554.4 R .029
(ariable name with a subscript as an ar)-.25 F .028
(gument to a command, such as with)-.18 F F2(unset)2.528 E F0 2.528(,w)C
.028(ithout us-)-2.528 F .937(ing the w)108 566.4 R .937(ord e)-.1 F
.937(xpansion syntax described abo)-.15 F -.15(ve)-.15 G 3.437(,t).15 G
.937(he ar)-3.437 F .938(gument is subject to pathname e)-.18 F 3.438
(xpansion. If)-.15 F(path-)3.438 E(name e)108 578.4 Q
(xpansion is not desired, the ar)-.15 E(gument should be quoted.)-.18 E
(The)108 595.2 Q F2(declar)2.684 E(e)-.18 E F0(,)A F2(local)2.684 E F0
2.684(,a)C(nd)-2.684 E F2 -.18(re)2.684 G(adonly).18 E F0 -.2(bu)2.684 G
.184(iltins each accept a).2 F F2<ad61>2.684 E F0 .184
(option to specify an inde)2.684 F -.15(xe)-.15 G 2.683(da).15 G .183
(rray and a)-2.683 F F2<ad41>2.683 E F0(op-)2.683 E .041
(tion to specify an associati)108 607.2 R .341 -.15(ve a)-.25 H(rray).15
E 5.041(.I)-.65 G 2.541(fb)-5.041 G .041(oth options are supplied,)
-2.541 F F2<ad41>2.541 E F0(tak)2.541 E .041(es precedence.)-.1 F(The)
5.041 E F2 -.18(re)2.542 G(ad).18 E F0 -.2(bu)2.542 G .042(iltin ac-).2
F .864(cepts a)108 619.2 R F2<ad61>3.364 E F0 .864
(option to assign a list of w)3.364 F .864
(ords read from the standard input to an array)-.1 F 5.863(.T)-.65 G(he)
-5.863 E F2(set)3.363 E F0(and)3.363 E F2(declar)3.363 E(e)-.18 E F0 -.2
(bu)108 631.2 S(iltins display array v).2 E(alues in a w)-.25 E
(ay that allo)-.1 E(ws them to be reused as assignments.)-.25 E/F4 10.95
/Times-Bold@0 SF(EXP)72 648 Q(ANSION)-.81 E F0 .76(Expansion is perform\
ed on the command line after it has been split into w)108 660 R 3.26
(ords. There)-.1 F .76(are se)3.26 F -.15(ve)-.25 G 3.26(nk).15 G .76
(inds of)-3.26 F -.15(ex)108 672 S .201(pansion performed:).15 F F1(br)
2.971 E .201(ace e)-.15 F(xpansion)-.2 E F0(,).24 E F1 .201(tilde e)
2.831 F(xpansion)-.2 E F0(,).24 E F1(par)3.951 E .201
(ameter and variable e)-.15 F(xpansion)-.2 E F0(,).24 E F1 .2
(command sub-)2.901 F(stitution)108 684 Q F0(,).24 E F1(arithmetic e)
2.83 E(xpansion)-.2 E F0(,).24 E F1(wor)2.84 E 2.5(ds)-.37 G(plitting)
-2.5 E F0 2.5(,a).22 G(nd)-2.5 E F1(pathname e)3.75 E(xpansion)-.2 E F0
(.).24 E .418(The order of e)108 700.8 R .418(xpansions is: brace e)-.15
F .418(xpansion; tilde e)-.15 F .419(xpansion, parameter and v)-.15 F
.419(ariable e)-.25 F .419(xpansion, arithmetic)-.15 F -.15(ex)108 712.8
S .196(pansion, and command substitution \(done in a left-to-right f).15
F .195(ashion\); w)-.1 F .195(ord splitting; and pathname e)-.1 F(xpan-)
-.15 E(sion.)108 724.8 Q(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E
(20)190.395 E 0 Cg EP
%%Page: 21 21
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .257
(On systems that can support it, there is an additional e)108 84 R .257
(xpansion a)-.15 F -.25(va)-.2 G(ilable:).25 E/F1 10/Times-Italic@0 SF
(pr)2.757 E .257(ocess substitution)-.45 F F0 5.257(.T)C .257
(his is per)-5.257 F(-)-.2 E
(formed at the same time as tilde, parameter)108 96 Q 2.5(,v)-.4 G
(ariable, and arithmetic e)-2.75 E(xpansion and command substitution.)
-.15 E .003(After these e)108 112.8 R .003
(xpansions are performed, quote characters present in the original w)
-.15 F .002(ord are remo)-.1 F -.15(ve)-.15 G 2.502(du).15 G .002
(nless the)-2.502 F(y)-.15 E(ha)108 124.8 Q .3 -.15(ve b)-.2 H
(een quoted themselv).15 E(es \()-.15 E F1(quote r)A(emo)-.37 E(val)-.1
E F0(\).)A .171(Only brace e)108 141.6 R .171(xpansion, w)-.15 F .171
(ord splitting, and pathname e)-.1 F .171
(xpansion can increase the number of w)-.15 F .172(ords of the e)-.1 F
(x-)-.15 E .777(pansion; other e)108 153.6 R .776(xpansions e)-.15 F
.776(xpand a single w)-.15 F .776(ord to a single w)-.1 F 3.276
(ord. The)-.1 F .776(only e)3.276 F .776(xceptions to this are the e)
-.15 F(x-)-.15 E .695(pansions of ")108 165.6 R/F2 10/Times-Bold@0 SF
($@)A F0 3.195("a)C .695(nd ")-3.195 F F2(${)A F1(name)A F2([@]})A F0
.696(", and, in most cases,)B F2($*)3.196 E F0(and)3.196 E F2(${)3.196 E
F1(name)A F2([*]})A F0 .696(as e)3.196 F .696(xplained abo)-.15 F .996
-.15(ve \()-.15 H(see).15 E/F3 9/Times-Bold@0 SF -.666(PA)3.196 G(-).666
E(RAMETERS)108 177.6 Q/F4 9/Times-Roman@0 SF(\).)A F2(Brace Expansion)87
194.4 Q F1(Br)108.58 206.4 Q .606(ace e)-.15 F(xpansion)-.2 E F0 .606
(is a mechanism by which arbitrary strings may be generated.)3.346 F
.606(This mechanism is similar)5.606 F(to)108 218.4 Q F1 .415
(pathname e)2.915 F(xpansion)-.2 E F0 2.915(,b)C .415
(ut the \214lenames generated need not e)-3.115 F 2.915(xist. P)-.15 F
.415(atterns to be brace e)-.15 F .415(xpanded tak)-.15 F 2.915(et)-.1 G
(he)-2.915 E .074(form of an optional)108 230.4 R F1(pr)3.823 E(eamble)
-.37 E F0 2.573(,f).18 G(ollo)-2.573 E .073
(wed by either a series of comma-separated strings or a sequence e)-.25
F(xpres-)-.15 E .489(sion between a pair of braces, follo)108 242.4 R
.489(wed by an optional)-.25 F F1(postscript)4.239 E F0 5.49(.T).68 G
.49(he preamble is pre\214x)-5.49 F .49(ed to each string)-.15 F .659(c\
ontained within the braces, and the postscript is then appended to each\
 resulting string, e)108 254.4 R .658(xpanding left to)-.15 F(right.)108
266.4 Q .718(Brace e)108 283.2 R .719(xpansions may be nested.)-.15 F
.719(The results of each e)5.719 F .719
(xpanded string are not sorted; left to right order is)-.15 F(preserv)
108 295.2 Q 2.5(ed. F)-.15 F(or e)-.15 E(xample, a)-.15 E F2({)A F0
(d,c,b)A F2(})A F0 2.5(ee)C(xpands into `ade ace abe'.)-2.65 E 3.243(As)
108 312 S .743(equence e)-3.243 F .743(xpression tak)-.15 F .743
(es the form)-.1 F F2({)3.243 E F1(x)A F2(..)A F1(y)A F2([..)A F1(incr)A
F2(]})A F0 3.243(,w)C(here)-3.243 E F1(x)3.243 E F0(and)3.242 E F1(y)
3.242 E F0 .742(are either inte)3.242 F .742(gers or single characters,)
-.15 F(and)108 324 Q F1(incr)3.031 E F0 3.031(,a)C 3.032(no)-3.031 G
.532(ptional increment, is an inte)-3.032 F(ger)-.15 E 5.532(.W)-.55 G
.532(hen inte)-5.532 F .532(gers are supplied, the e)-.15 F .532
(xpression e)-.15 F .532(xpands to each)-.15 F .078(number between)108
336 R F1(x)2.578 E F0(and)2.578 E F1(y)2.578 E F0 2.578(,i)C(nclusi)
-2.578 E -.15(ve)-.25 G 5.078(.S).15 G .078(upplied inte)-5.078 F .077
(gers may be pre\214x)-.15 F .077(ed with)-.15 F F1(0)2.577 E F0 .077
(to force each term to ha)2.577 F .377 -.15(ve t)-.2 H(he).15 E .014
(same width.)108 348 R .014(When either)5.014 F F1(x)2.514 E F0(or)2.514
E F1(y)2.514 E F0(be)2.514 E .015(gins with a zero, the shell attempts \
to force all generated terms to contain)-.15 F 1.143
(the same number of digits, zero-padding where necessary)108 360 R 6.143
(.W)-.65 G 1.143(hen characters are supplied, the e)-6.143 F(xpression)
-.15 E -.15(ex)108 372 S 1.064(pands to each character le).15 F 1.064
(xicographically between)-.15 F F1(x)3.564 E F0(and)3.564 E F1(y)3.564 E
F0 3.564(,i)C(nclusi)-3.564 E -.15(ve)-.25 G 3.564(,u).15 G 1.064
(sing the def)-3.564 F 1.064(ault C locale.)-.1 F(Note)6.064 E .245
(that both)108 384 R F1(x)2.745 E F0(and)2.745 E F1(y)2.745 E F0 .245
(must be of the same type.)2.745 F .244
(When the increment is supplied, it is used as the dif)5.245 F .244
(ference be-)-.25 F(tween each term.)108 396 Q(The def)5 E
(ault increment is 1 or \2551 as appropriate.)-.1 E .581(Brace e)108
412.8 R .581(xpansion is performed before an)-.15 F 3.081(yo)-.15 G .581
(ther e)-3.081 F .581(xpansions, and an)-.15 F 3.082(yc)-.15 G .582
(haracters special to other e)-3.082 F(xpansions)-.15 E .016
(are preserv)108 424.8 R .016(ed in the result.)-.15 F .016
(It is strictly te)5.016 F(xtual.)-.15 E F2(Bash)5.016 E F0 .015
(does not apply an)2.516 F 2.515(ys)-.15 G .015
(yntactic interpretation to the con-)-2.515 F(te)108 436.8 Q
(xt of the e)-.15 E(xpansion or the te)-.15 E(xt between the braces.)
-.15 E 2.501(Ac)108 453.6 S .001(orrectly-formed brace e)-2.501 F .001(\
xpansion must contain unquoted opening and closing braces, and at least\
 one un-)-.15 F .458(quoted comma or a v)108 465.6 R .458
(alid sequence e)-.25 F 2.958(xpression. An)-.15 F 2.958(yi)-.15 G .458
(ncorrectly formed brace e)-2.958 F .457(xpansion is left unchanged.)
-.15 F(A)108 477.6 Q F2({)2.521 E F0(or)2.521 E F2(,)2.521 E F0 .021
(may be quoted with a backslash to pre)2.521 F -.15(ve)-.25 G .022
(nt its being considered part of a brace e).15 F 2.522(xpression. T)-.15
F 2.522(oa)-.8 G -.2(vo)-2.722 G(id).2 E .172
(con\215icts with parameter e)108 489.6 R .172(xpansion, the string)-.15
F F2(${)2.672 E F0 .172(is not considered eligible for brace e)2.672 F
.172(xpansion, and inhibits)-.15 F(brace e)108 501.6 Q
(xpansion until the closing)-.15 E F2(})2.5 E F0(.)A 1.476(This constru\
ct is typically used as shorthand when the common pre\214x of the strin\
gs to be generated is)108 518.4 R(longer than in the abo)108 530.4 Q .3
-.15(ve ex)-.15 H(ample:).15 E(mkdir /usr/local/src/bash/{old,ne)144
547.2 Q -.65(w,)-.25 G(dist,b).65 E(ugs})-.2 E(or)108 559.2 Q(cho)144
571.2 Q(wn root /usr/{ucb/{e)-.25 E(x,edit},lib/{e)-.15 E(x?.?*,ho)-.15
E(w_e)-.25 E(x}})-.15 E .618(Brace e)108 588 R .618
(xpansion introduces a slight incompatibility with historical v)-.15 F
.618(ersions of)-.15 F F2(sh)3.118 E F0(.)A F2(sh)5.618 E F0 .618
(does not treat open-)3.118 F .247
(ing or closing braces specially when the)108 600 R 2.747(ya)-.15 G .247
(ppear as part of a w)-2.747 F .248(ord, and preserv)-.1 F .248
(es them in the output.)-.15 F F2(Bash)5.248 E F0(remo)108 612 Q -.15
(ve)-.15 G 3.53(sb).15 G 1.03(races from w)-3.53 F 1.03
(ords as a consequence of brace e)-.1 F 3.53(xpansion. F)-.15 F 1.03
(or e)-.15 F 1.03(xample, a w)-.15 F 1.03(ord entered to)-.1 F F2(sh)
3.53 E F0(as)3.53 E F1(\214le{1,2})108 624 Q F0 .514
(appears identically in the output.)3.014 F .515(The same w)5.515 F .515
(ord is output as)-.1 F F1 .515(\214le1 \214le2)4.925 F F0 .515(after e)
3.035 F .515(xpansion by)-.15 F F2(bash)3.015 E F0(.)A .437
(If strict compatibility with)108 636 R F2(sh)2.936 E F0 .436
(is desired, start)2.936 F F2(bash)2.936 E F0 .436(with the)2.936 F F2
(+B)2.936 E F0 .436(option or disable brace e)2.936 F .436
(xpansion with the)-.15 F F2(+B)108 648 Q F0(option to the)2.5 E F2(set)
2.5 E F0(command \(see)2.5 E F3(SHELL B)2.5 E(UIL)-.09 E(TIN COMMANDS)
-.828 E F0(belo)2.25 E(w\).)-.25 E F2 -.18(Ti)87 664.8 S(lde Expansion)
.18 E F0 1.086(If a w)108 676.8 R 1.086(ord be)-.1 F 1.086
(gins with an unquoted tilde character \(`)-.15 F F2(~)A F0 1.087
('\), all of the characters preceding the \214rst unquoted)B .185(slash\
 \(or all characters, if there is no unquoted slash\) are considered a)
108 688.8 R F1(tilde-pr)2.685 E(e\214x)-.37 E F0 5.185(.I)C 2.685(fn)
-5.185 G .185(one of the characters)-2.685 F .725(in the tilde-pre\214x\
 are quoted, the characters in the tilde-pre\214x follo)108 700.8 R .726
(wing the tilde are treated as a possible)-.25 F F1(lo)108 712.8 Q .523
(gin name)-.1 F F0 5.523(.I)C 3.023(ft)-5.523 G .523
(his login name is the null string, the tilde is replaced with the v)
-3.023 F .522(alue of the shell parameter)-.25 F F3(HOME)108 724.8 Q F4
(.)A F0(If)6.735 E F3(HOME)4.735 E F0 2.236
(is unset, the home directory of the user e)4.486 F -.15(xe)-.15 G 2.236
(cuting the shell is substituted instead.).15 F(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(21)190.395 E 0 Cg EP
%%Page: 22 22
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(Otherwise, the ti\
lde-pre\214x is replaced with the home directory associated with the sp\
eci\214ed login name.)108 84 Q .093
(If the tilde-pre\214x is a `~+', the v)108 100.8 R .092
(alue of the shell v)-.25 F(ariable)-.25 E/F1 9/Times-Bold@0 SF(PWD)
2.592 E F0 .092(replaces the tilde-pre\214x.)2.342 F .092
(If the tilde-pre\214x is)5.092 F 3.403(a`)108 112.8 S .903
(~\255', the v)-3.403 F .903(alue of the shell v)-.25 F(ariable)-.25 E
F1(OLDPWD)3.404 E/F2 9/Times-Roman@0 SF(,)A F0 .904
(if it is set, is substituted.)3.154 F .904(If the characters follo)
5.904 F .904(wing the)-.25 F .88
(tilde in the tilde-pre\214x consist of a number)108 124.8 R/F3 10
/Times-Italic@0 SF(N)3.38 E F0 3.38(,o)C .88(ptionally pre\214x)-3.38 F
.879(ed by a `+' or a `\255', the tilde-pre\214x is re-)-.15 F .138(pla\
ced with the corresponding element from the directory stack, as it w)108
136.8 R .138(ould be displayed by the)-.1 F/F4 10/Times-Bold@0 SF(dirs)
2.639 E F0 -.2(bu)2.639 G(iltin).2 E(in)108 148.8 Q -.2(vo)-.4 G -.1(ke)
.2 G 2.839(dw).1 G .338(ith the tilde-pre\214x as an ar)-2.839 F 2.838
(gument. If)-.18 F .338(the characters follo)2.838 F .338
(wing the tilde in the tilde-pre\214x consist)-.25 F
(of a number without a leading `+' or `\255', `+' is assumed.)108 160.8
Q(If the login name is in)108 177.6 Q -.25(va)-.4 G(lid, or the tilde e)
.25 E(xpansion f)-.15 E(ails, the w)-.1 E(ord is unchanged.)-.1 E .166
(Each v)108 194.4 R .167(ariable assignment is check)-.25 F .167
(ed for unquoted tilde-pre\214x)-.1 F .167(es immediately follo)-.15 F
.167(wing a)-.25 F F4(:)2.667 E F0 .167(or the \214rst)2.667 F F4(=)
2.667 E F0 5.167(.I)C(n)-5.167 E .468(these cases, tilde e)108 206.4 R
.468(xpansion is also performed.)-.15 F(Consequently)5.467 E 2.967(,o)
-.65 G .467(ne may use \214lenames with tildes in assign-)-2.967 F
(ments to)108 218.4 Q F1 -.666(PA)2.5 G(TH)-.189 E F2(,)A F1(MAILP)2.25
E -.855(AT)-.666 G(H).855 E F2(,)A F0(and)2.25 E F1(CDP)2.5 E -.855(AT)
-.666 G(H).855 E F2(,)A F0(and the shell assigns the e)2.25 E(xpanded v)
-.15 E(alue.)-.25 E .023(Bash also performs tilde e)108 235.2 R .023
(xpansion on w)-.15 F .024(ords satisfying the conditions of v)-.1 F
.024(ariable assignments \(as described)-.25 F(abo)108 247.2 Q .77 -.15
(ve u)-.15 H(nder).15 E F1 -.666(PA)2.97 G(RAMETERS).666 E F2(\))A F0
.47(when the)2.72 F 2.969(ya)-.15 G .469(ppear as ar)-2.969 F .469
(guments to simple commands.)-.18 F .469(Bash does not do this,)5.469 F
-.15(ex)108 259.2 S(cept for the).15 E F3(declar)2.5 E(ation)-.15 E F0
(commands listed abo)2.5 E -.15(ve)-.15 G 2.5(,w).15 G(hen in)-2.5 E F3
(posix mode)2.5 E F0(.)A F4 -.1(Pa)87 276 S(rameter Expansion).1 E F0
.199(The `)108 288 R F4($)A F0 2.699('c)C .199
(haracter introduces parameter e)-2.699 F .199
(xpansion, command substitution, or arithmetic e)-.15 F 2.7
(xpansion. The)-.15 F(pa-)2.7 E .314(rameter name or symbol to be e)108
300 R .314(xpanded may be enclosed in braces, which are optional b)-.15
F .314(ut serv)-.2 F 2.813(et)-.15 G 2.813(op)-2.813 G(rotect)-2.813 E
.414(the v)108 312 R .414(ariable to be e)-.25 F .414
(xpanded from characters immediately follo)-.15 F .415
(wing it which could be interpreted as part of)-.25 F(the name.)108 324
Q 1.19(When braces are used, the matching ending brace is the \214rst `)
108 340.8 R F4(})A F0 3.689('n)C 1.189
(ot escaped by a backslash or within a)-3.689 F .821
(quoted string, and not within an embedded arithmetic e)108 352.8 R .822
(xpansion, command substitution, or parameter e)-.15 F(x-)-.15 E
(pansion.)108 364.8 Q(${)108 381.6 Q F3(par)A(ameter)-.15 E F0(})A .106
(The v)144 393.6 R .106(alue of)-.25 F F3(par)2.606 E(ameter)-.15 E F0
.106(is substituted.)2.606 F .106(The braces are required when)5.106 F
F3(par)3.856 E(ameter)-.15 E F0 .106(is a positional pa-)3.336 F .11
(rameter with more than one digit, or when)144 405.6 R F3(par)3.86 E
(ameter)-.15 E F0 .111(is follo)3.341 F .111
(wed by a character which is not to be)-.25 F .208
(interpreted as part of its name.)144 417.6 R(The)5.208 E F3(par)2.708 E
(ameter)-.15 E F0 .208(is a shell parameter as described abo)2.708 F
-.15(ve)-.15 G F4 -.74(PA)2.858 G(RAME-).74 E(TERS)144 429.6 Q F0 2.5
(\)o)C 2.5(ra)-2.5 G 2.5(na)-2.5 G(rray reference \()-2.5 E F4(Arrays)A
F0(\).)A .346(If the \214rst character of)108 446.4 R F3(par)2.846 E
(ameter)-.15 E F0 .346(is an e)2.846 F .346(xclamation point \()-.15 F
F4(!)A F0 .346(\), and)B F3(par)2.846 E(ameter)-.15 E F0 .346(is not a)
2.846 F F3(namer)2.846 E(ef)-.37 E F0 2.847(,i)C 2.847(ti)-2.847 G
(ntroduces)-2.847 E 2.907(al)108 458.4 S -2.15 -.25(ev e)-2.907 H 2.907
(lo).25 G 2.906(fi)-2.907 G(ndirection.)-2.906 E F4(Bash)5.406 E F0 .406
(uses the v)2.906 F .406(alue formed by e)-.25 F .406
(xpanding the rest of)-.15 F F3(par)2.906 E(ameter)-.15 E F0 .406
(as the ne)2.906 F(w)-.25 E F3(par)2.906 E(ame-)-.15 E(ter)108 470.4 Q
F0 2.578(;t)C .078(his is then e)-2.578 F .078(xpanded and that v)-.15 F
.079(alue is used in the rest of the e)-.25 F .079
(xpansion, rather than the e)-.15 F .079(xpansion of the)-.15 F
(original)108 482.4 Q F3(par)2.543 E(ameter)-.15 E F0 5.043(.T)C .043
(his is kno)-5.043 F .043(wn as)-.25 F F3(indir)2.543 E .043(ect e)-.37
F(xpansion)-.2 E F0 5.043(.T)C .043(he v)-5.043 F .042
(alue is subject to tilde e)-.25 F .042(xpansion, parameter)-.15 F -.15
(ex)108 494.4 S .248(pansion, command substitution, and arithmetic e).15
F 2.748(xpansion. If)-.15 F F3(par)2.749 E(ameter)-.15 E F0 .249
(is a nameref, this e)2.749 F .249(xpands to the)-.15 F 1.51
(name of the parameter referenced by)108 506.4 R F3(par)4.01 E(ameter)
-.15 E F0 1.51(instead of performing the complete indirect e)4.01 F
(xpansion.)-.15 E .387(The e)108 518.4 R .387
(xceptions to this are the e)-.15 F .387(xpansions of ${)-.15 F F4(!)A
F3(pr)A(e\214x)-.37 E F4(*)A F0 2.887(}a)C .387(nd ${)-2.887 F F4(!)A F3
(name)A F0([)A F3(@)A F0 .387(]} described belo)B 4.188 -.65(w. T)-.25 H
.388(he e).65 F(xclama-)-.15 E(tion point must immediately follo)108
530.4 Q 2.5(wt)-.25 G(he left brace in order to introduce indirection.)
-2.5 E .334(In each of the cases belo)108 547.2 R -.65(w,)-.25 G F3(wor)
3.484 E(d)-.37 E F0 .334(is subject to tilde e)2.834 F .334
(xpansion, parameter e)-.15 F .334(xpansion, command substitution,)-.15
F(and arithmetic e)108 559.2 Q(xpansion.)-.15 E .066
(When not performing substring e)108 576 R .067
(xpansion, using the forms documented belo)-.15 F 2.567(w\()-.25 G
(e.g.,)-2.567 E F4(:-)2.567 E F0(\),)A F4(bash)2.567 E F0 .067
(tests for a pa-)2.567 F(rameter that is unset or null.)108 588 Q(Omitt\
ing the colon results in a test only for a parameter that is unset.)5 E
(${)108 604.8 Q F3(par)A(ameter)-.15 E F4<3aad>A F3(wor)A(d)-.37 E F0(})
A F4 .723(Use Default V)144 616.8 R(alues)-.92 E F0 5.723(.I)C(f)-5.723
E F3(par)4.473 E(ameter)-.15 E F0 .723(is unset or null, the e)3.953 F
.722(xpansion of)-.15 F F3(wor)3.562 E(d)-.37 E F0 .722(is substituted.)
3.992 F(Other)5.722 E(-)-.2 E(wise, the v)144 628.8 Q(alue of)-.25 E F3
(par)3.75 E(ameter)-.15 E F0(is substituted.)3.23 E(${)108 640.8 Q F3
(par)A(ameter)-.15 E F4(:=)A F3(wor)A(d)-.37 E F0(})A F4 .811
(Assign Default V)144 652.8 R(alues)-.92 E F0 5.812(.I)C(f)-5.812 E F3
(par)4.562 E(ameter)-.15 E F0 .812(is unset or null, the e)4.042 F .812
(xpansion of)-.15 F F3(wor)3.652 E(d)-.37 E F0 .812(is assigned to)4.082
F F3(pa-)4.562 E -.15(ra)144 664.8 S(meter).15 E F0 5.742(.T).73 G .742
(he v)-5.742 F .742(alue of)-.25 F F3(par)4.492 E(ameter)-.15 E F0 .742
(is then substituted.)3.972 F .741
(Positional parameters and special parame-)5.742 F
(ters may not be assigned to in this w)144 676.8 Q(ay)-.1 E(.)-.65 E(${)
108 688.8 Q F3(par)A(ameter)-.15 E F4(:?)A F3(wor)A(d)-.37 E F0(})A F4
.535(Display Err)144 700.8 R .535(or if Null or Unset)-.18 F F0 5.535
(.I)C(f)-5.535 E F3(par)4.285 E(ameter)-.15 E F0 .535
(is null or unset, the e)3.765 F .535(xpansion of)-.15 F F3(wor)3.035 E
(d)-.37 E F0 .535(\(or a mes-)3.035 F .013(sage to that ef)144 712.8 R
.013(fect if)-.25 F F3(wor)2.853 E(d)-.37 E F0 .013(is not present\) is\
 written to the standard error and the shell, if it is not in-)3.283 F
(teracti)144 724.8 Q -.15(ve)-.25 G 2.5(,e).15 G 2.5(xits. Otherwise,)
-2.65 F(the v)2.5 E(alue of)-.25 E F3(par)2.5 E(ameter)-.15 E F0
(is substituted.)2.5 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E
(22)190.395 E 0 Cg EP
%%Page: 23 23
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(${)108 84 Q/F1 10
/Times-Italic@0 SF(par)A(ameter)-.15 E/F2 10/Times-Bold@0 SF(:+)A F1
(wor)A(d)-.37 E F0(})A F2 .745(Use Alter)144 96 R .745(nate V)-.15 F
(alue)-.92 E F0 5.745(.I)C(f)-5.745 E F1(par)4.495 E(ameter)-.15 E F0
.745(is null or unset, nothing is substituted, otherwise the e)3.975 F
(xpan-)-.15 E(sion of)144 108 Q F1(wor)2.84 E(d)-.37 E F0
(is substituted.)3.27 E(${)108 120 Q F1(par)A(ameter)-.15 E F2(:)A F1
(of)A(fset)-.18 E F0(})A(${)108 132 Q F1(par)A(ameter)-.15 E F2(:)A F1
(of)A(fset)-.18 E F2(:)A F1(length)A F0(})A F2 .002(Substring Expansion)
144 144 R F0 5.002(.E)C .002(xpands to up to)-5.002 F F1(length)2.502 E
F0 .002(characters of the v)2.502 F .002(alue of)-.25 F F1(par)2.502 E
(ameter)-.15 E F0 .002(starting at the)2.502 F .235
(character speci\214ed by)144 156 R F1(of)2.735 E(fset)-.18 E F0 5.235
(.I)C(f)-5.235 E F1(par)2.735 E(ameter)-.15 E F0(is)2.735 E F2(@)2.735 E
F0 2.735(,a)C 2.735(ni)-2.735 G(nde)-2.735 E -.15(xe)-.15 G 2.735(da).15
G .235(rray subscripted by)-2.735 F F2(@)2.735 E F0(or)2.735 E F2(*)
2.735 E F0 2.735(,o)C 2.735(ra)-2.735 G 2.735(na)-2.735 G(s-)-2.735 E
(sociati)144 168 Q 1.578 -.15(ve a)-.25 H 1.278
(rray name, the results dif).15 F 1.277(fer as described belo)-.25 F
5.077 -.65(w. I)-.25 H(f).65 E F1(length)3.777 E F0 1.277(is omitted, e)
3.777 F 1.277(xpands to the)-.15 F .042(substring of the v)144 180 R
.042(alue of)-.25 F F1(par)2.542 E(ameter)-.15 E F0 .043
(starting at the character speci\214ed by)2.542 F F1(of)2.543 E(fset)
-.18 E F0 .043(and e)2.543 F .043(xtending to the)-.15 F .847
(end of the v)144 192 R(alue.)-.25 E F1(length)5.846 E F0(and)3.346 E F1
(of)3.346 E(fset)-.18 E F0 .846(are arithmetic e)3.346 F .846
(xpressions \(see)-.15 F/F3 9/Times-Bold@0 SF .846(ARITHMETIC EV)3.346 F
(ALU)-1.215 E -.855(AT)-.54 G(ION).855 E F0(belo)144 204 Q(w\).)-.25 E
(If)144 228 Q F1(of)3.028 E(fset)-.18 E F0 -.25(eva)3.029 G .529
(luates to a number less than zero, the v).25 F .529
(alue is used as an of)-.25 F .529(fset in characters from the)-.25 F
.046(end of the v)144 240 R .046(alue of)-.25 F F1(par)2.546 E(ameter)
-.15 E F0 5.046(.I)C(f)-5.046 E F1(length)2.546 E F0 -.25(eva)2.546 G
.046(luates to a number less than zero, it is interpreted as an).25 F
(of)144 252 Q .202(fset in characters from the end of the v)-.25 F .202
(alue of)-.25 F F1(par)2.702 E(ameter)-.15 E F0 .203
(rather than a number of characters, and)2.702 F .558(the e)144 264 R
.558(xpansion is the characters between)-.15 F F1(of)3.058 E(fset)-.18 E
F0 .558(and that result.)3.058 F .557(Note that a ne)5.557 F -.05(ga)
-.15 G(ti).05 E .857 -.15(ve o)-.25 H -.25(ff).15 G .557(set must be).25
F(separated from the colon by at least one space to a)144 276 Q -.2(vo)
-.2 G(id being confused with the).2 E F2(:-)2.5 E F0 -.15(ex)2.5 G
(pansion.).15 E(If)144 300 Q F1(par)2.958 E(ameter)-.15 E F0(is)2.958 E
F2(@)2.958 E F0 2.958(,t)C .458(he result is)-2.958 F F1(length)2.959 E
F0 .459(positional parameters be)2.959 F .459(ginning at)-.15 F F1(of)
2.959 E(fset)-.18 E F0 5.459(.A)C(ne)-2.5 E -.05(ga)-.15 G(ti).05 E -.15
(ve)-.25 G F1(of)3.109 E(fset)-.18 E F0 .6(is tak)144 312 R .6
(en relati)-.1 F .9 -.15(ve t)-.25 H 3.1(oo).15 G .6
(ne greater than the greatest positional parameter)-3.1 F 3.1(,s)-.4 G
3.1(oa)-3.1 G 3.1(no)-3.1 G -.25(ff)-3.1 G .6(set of \2551 e).25 F -.25
(va)-.25 G(luates).25 E .639(to the last positional parameter)144 324 R
5.639(.I)-.55 G 3.139(ti)-5.639 G 3.139(sa)-3.139 G 3.139(ne)-3.139 G
.639(xpansion error if)-3.289 F F1(length)3.14 E F0 -.25(eva)3.14 G .64
(luates to a number less than).25 F(zero.)144 336 Q(If)144 360 Q F1(par)
3.014 E(ameter)-.15 E F0 .514(is an inde)3.014 F -.15(xe)-.15 G 3.014
(da).15 G .514(rray name subscripted by @ or *, the result is the)-3.014
F F1(length)3.014 E F0 .513(members of)3.013 F 1.081(the array be)144
372 R 1.081(ginning with ${)-.15 F F1(par)A(ameter)-.15 E F0([)A F1(of)A
(fset)-.18 E F0 3.581(]}. A)B(ne)3.581 E -.05(ga)-.15 G(ti).05 E -.15
(ve)-.25 G F1(of)3.732 E(fset)-.18 E F0 1.082(is tak)3.582 F 1.082
(en relati)-.1 F 1.382 -.15(ve t)-.25 H 3.582(oo).15 G 1.082(ne greater)
-3.582 F 1.08(than the maximum inde)144 384 R 3.58(xo)-.15 G 3.58(ft)
-3.58 G 1.08(he speci\214ed array)-3.58 F 6.079(.I)-.65 G 3.579(ti)
-6.079 G 3.579(sa)-3.579 G 3.579(ne)-3.579 G 1.079(xpansion error if)
-3.729 F F1(length)3.579 E F0 -.25(eva)3.579 G 1.079(luates to a).25 F
(number less than zero.)144 396 Q(Substring e)144 420 Q
(xpansion applied to an associati)-.15 E .3 -.15(ve a)-.25 H
(rray produces unde\214ned results.).15 E .82(Substring inde)144 444 R
.821(xing is zero-based unless the positional parameters are used, in w\
hich case the in-)-.15 F(de)144 456 Q .159(xing starts at 1 by def)-.15
F 2.659(ault. If)-.1 F F1(of)2.659 E(fset)-.18 E F0 .159
(is 0, and the positional parameters are used,)2.659 F F2($0)2.659 E F0
.159(is pre\214x)2.659 F .158(ed to)-.15 F(the list.)144 468 Q(${)108
484.8 Q F2(!)A F1(pr)A(e\214x)-.37 E F2(*)A F0(})A(${)108 496.8 Q F2(!)A
F1(pr)A(e\214x)-.37 E F2(@)A F0(})A F2 .084(Names matching pr)144 508.8
R(e\214x)-.18 E F0 5.084(.E)C .084(xpands to the names of v)-5.084 F
.084(ariables whose names be)-.25 F .085(gin with)-.15 F F1(pr)2.585 E
(e\214x)-.37 E F0 2.585(,s)C(epa-)-2.585 E .258
(rated by the \214rst character of the)144 520.8 R F3(IFS)2.758 E F0
.257(special v)2.507 F 2.757(ariable. When)-.25 F F1(@)2.757 E F0 .257
(is used and the e)2.757 F .257(xpansion appears)-.15 F
(within double quotes, each v)144 532.8 Q(ariable name e)-.25 E
(xpands to a separate w)-.15 E(ord.)-.1 E(${)108 549.6 Q F2(!)A F1(name)
A F0([)A F1(@)A F0(]})A(${)108 561.6 Q F2(!)A F1(name)A F0([)A F1(*)A F0
(]})A F2 1.136(List of array k)144 573.6 R(eys)-.1 E F0 6.136(.I)C(f)
-6.136 E F1(name)3.636 E F0 1.136(is an array v)3.636 F 1.136
(ariable, e)-.25 F 1.136(xpands to the list of array indices \(k)-.15 F
-.15(ey)-.1 G 1.137(s\) as-).15 F .397(signed in)144 585.6 R F1(name)
2.897 E F0 5.397(.I)C(f)-5.397 E F1(name)2.897 E F0 .397
(is not an array)2.897 F 2.897(,e)-.65 G .397(xpands to 0 if)-3.047 F F1
(name)2.897 E F0 .397(is set and null otherwise.)2.897 F(When)5.397 E F1
(@)2.897 E F0(is used and the e)144 597.6 Q
(xpansion appears within double quotes, each k)-.15 E .3 -.15(ey ex)-.1
H(pands to a separate w).15 E(ord.)-.1 E(${)108 614.4 Q F2(#)A F1(par)A
(ameter)-.15 E F0(})A F2 -.1(Pa)144 626.4 S .47(rameter length).1 F F0
5.47(.T)C .471(he length in characters of the v)-5.47 F .471(alue of)
-.25 F F1(par)2.971 E(ameter)-.15 E F0 .471(is substituted.)2.971 F(If)
5.471 E F1(par)4.221 E(ame-)-.15 E(ter)144 638.4 Q F0(is)3.627 E F2(*)
2.897 E F0(or)2.897 E F2(@)2.897 E F0 2.897(,t)C .397(he v)-2.897 F .397
(alue substituted is the number of positional parameters.)-.25 F(If)
5.396 E F1(par)4.146 E(ameter)-.15 E F0 .396(is an ar)3.626 F(-)-.2 E
.78(ray name subscripted by)144 650.4 R F2(*)3.28 E F0(or)3.28 E F2(@)
3.28 E F0 3.28(,t)C .78(he v)-3.28 F .781
(alue substituted is the number of elements in the array)-.25 F 5.781
(.I)-.65 G(f)-5.781 E F1(par)145.25 662.4 Q(ameter)-.15 E F0 .456
(is an inde)3.686 F -.15(xe)-.15 G 2.956(da).15 G .456
(rray name subscripted by a ne)-2.956 F -.05(ga)-.15 G(ti).05 E .756
-.15(ve n)-.25 H(umber).15 E 2.955(,t)-.4 G .455
(hat number is interpreted)-2.955 F .972(as relati)144 674.4 R 1.272
-.15(ve t)-.25 H 3.472(oo).15 G .973(ne greater than the maximum inde)
-3.472 F 3.473(xo)-.15 G(f)-3.473 E F1(par)3.473 E(ameter)-.15 E F0
3.473(,s)C 3.473(on)-3.473 G -2.25 -.15(eg a)-3.473 H(ti).15 E 1.273
-.15(ve i)-.25 H .973(ndices count back).15 F(from the end of the array)
144 686.4 Q 2.5(,a)-.65 G(nd an inde)-2.5 E 2.5(xo)-.15 G 2.5<66ad>-2.5
G 2.5(1r)-2.5 G(eferences the last element.)-2.5 E(${)108 703.2 Q F1
(par)A(ameter)-.15 E F2(#)A F1(wor)A(d)-.37 E F0(})A(GNU Bash 5.1)72 768
Q(2020 October 29)141.235 E(23)190.395 E 0 Cg EP
%%Page: 24 24
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(${)108 84 Q/F1 10
/Times-Italic@0 SF(par)A(ameter)-.15 E/F2 10/Times-Bold@0 SF(##)A F1
(wor)A(d)-.37 E F0(})A F2(Remo)144 96 Q 1.396 -.1(ve m)-.1 H 1.196
(atching pr).1 F 1.196(e\214x patter)-.18 F(n)-.15 E F0 6.196(.T)C(he)
-6.196 E F1(wor)4.036 E(d)-.37 E F0 1.196(is e)4.466 F 1.196
(xpanded to produce a pattern just as in path-)-.15 F .543(name e)144
108 R .544(xpansion, and matched ag)-.15 F .544(ainst the e)-.05 F .544
(xpanded v)-.15 F .544(alue of)-.25 F F1(par)4.294 E(ameter)-.15 E F0
.544(using the rules described)3.774 F(under)144 120 Q F2 -.1(Pa)3.133 G
(tter).1 E 3.133(nM)-.15 G(atching)-3.133 E F0(belo)3.132 E 4.432 -.65
(w. I)-.25 H 3.132(ft).65 G .632(he pattern matches the be)-3.132 F .632
(ginning of the v)-.15 F .632(alue of)-.25 F F1(par)4.382 E(ameter)-.15
E F0(,).73 E 1.151(then the result of the e)144 132 R 1.151
(xpansion is the e)-.15 F 1.151(xpanded v)-.15 F 1.151(alue of)-.25 F F1
(par)4.902 E(ameter)-.15 E F0 1.152(with the shortest matching)4.382 F
.184(pattern \(the `)144 144 R(`)-.74 E F2(#)A F0 1.664 -.74('' c)D .184
(ase\) or the longest matching pattern \(the `).74 F(`)-.74 E F2(##)A F0
1.664 -.74('' c)D .184(ase\) deleted.).74 F(If)5.183 E F1(par)3.933 E
(ameter)-.15 E F0(is)3.413 E F2(@)2.683 E F0(or)144 156 Q F2(*)3.018 E
F0 3.018(,t)C .518(he pattern remo)-3.018 F -.25(va)-.15 G 3.018(lo).25
G .518
(peration is applied to each positional parameter in turn, and the e)
-3.018 F(xpan-)-.15 E .304(sion is the resultant list.)144 168 R(If)
5.304 E F1(par)4.054 E(ameter)-.15 E F0 .303(is an array v)3.533 F .303
(ariable subscripted with)-.25 F F2(@)2.803 E F0(or)2.803 E F2(*)2.803 E
F0 2.803(,t)C .303(he pattern re-)-2.803 F(mo)144 180 Q -.25(va)-.15 G
2.987(lo).25 G .487
(peration is applied to each member of the array in turn, and the e)
-2.987 F .487(xpansion is the resultant)-.15 F(list.)144 192 Q(${)108
208.8 Q F1(par)A(ameter)-.15 E F2(%)A F1(wor)A(d)-.37 E F0(})A(${)108
220.8 Q F1(par)A(ameter)-.15 E F2(%%)A F1(wor)A(d)-.37 E F0(})A F2(Remo)
144 232.8 Q .347 -.1(ve m)-.1 H .147(atching suf\214x patter).1 F(n)-.15
E F0 5.147(.T)C(he)-5.147 E F1(wor)2.647 E(d)-.37 E F0 .147(is e)2.647 F
.146(xpanded to produce a pattern just as in pathname)-.15 F -.15(ex)144
244.8 S .458(pansion, and matched ag).15 F .458(ainst the e)-.05 F .458
(xpanded v)-.15 F .458(alue of)-.25 F F1(par)4.209 E(ameter)-.15 E F0
.459(using the rules described under)3.689 F F2 -.1(Pa)144 256.8 S(tter)
.1 E 3.314(nM)-.15 G(atching)-3.314 E F0(belo)3.314 E 4.614 -.65(w. I)
-.25 H 3.314(ft).65 G .814
(he pattern matches a trailing portion of the e)-3.314 F .814(xpanded v)
-.15 F .814(alue of)-.25 F F1(pa-)4.564 E -.15(ra)144 268.8 S(meter).15
E F0 3.816(,t).73 G 1.316(hen the result of the e)-3.816 F 1.317
(xpansion is the e)-.15 F 1.317(xpanded v)-.15 F 1.317(alue of)-.25 F F1
(par)5.067 E(ameter)-.15 E F0 1.317(with the shortest)4.547 F 1.085
(matching pattern \(the `)144 280.8 R(`)-.74 E F2(%)A F0 2.565 -.74
('' c)D 1.084(ase\) or the longest matching pattern \(the `).74 F(`)-.74
E F2(%%)A F0 2.564 -.74('' c)D 1.084(ase\) deleted.).74 F(If)6.084 E F1
(par)145.25 292.8 Q(ameter)-.15 E F0(is)3.389 E F2(@)2.659 E F0(or)2.659
E F2(*)2.659 E F0 2.659(,t)C .159(he pattern remo)-2.659 F -.25(va)-.15
G 2.659(lo).25 G .16
(peration is applied to each positional parameter in turn,)-2.659 F .51
(and the e)144 304.8 R .51(xpansion is the resultant list.)-.15 F(If)
5.51 E F1(par)4.259 E(ameter)-.15 E F0 .509(is an array v)3.739 F .509
(ariable subscripted with)-.25 F F2(@)3.009 E F0(or)3.009 E F2(*)3.009 E
F0(,)A .422(the pattern remo)144 316.8 R -.25(va)-.15 G 2.922(lo).25 G
.422(peration is applied to each member of the array in turn, and the e)
-2.922 F .423(xpansion is)-.15 F(the resultant list.)144 328.8 Q(${)108
345.6 Q F1(par)A(ameter)-.15 E F2(/)A F1(pattern)A F2(/)A F1(string)A F0
(})A F2 -.1(Pa)144 357.6 S(tter).1 E 3.607(ns)-.15 G(ubstitution)-3.607
E F0 6.107(.T)C(he)-6.107 E F1(pattern)3.607 E F0 1.107(is e)3.607 F
1.106(xpanded to produce a pattern just as in pathname e)-.15 F(xpan-)
-.15 E(sion,)144 369.6 Q F1 -.8(Pa)3.7 G -.15(ra).8 G(meter).15 E F0 1.2
(is e)3.7 F 1.2(xpanded and the longest match of)-.15 F F1(pattern)3.7 E
F0(ag)3.7 E 1.2(ainst its v)-.05 F 1.2(alue is replaced with)-.25 F F1
(string)144 381.6 Q F0 5.397(.T)C .397
(he match is performed using the rules described under)-5.397 F F2 -.1
(Pa)2.896 G(tter).1 E 2.896(nM)-.15 G(atching)-2.896 E F0(belo)2.896 E
4.196 -.65(w. I)-.25 H(f).65 E F1(pat-)2.896 E(tern)144 393.6 Q F0(be)
2.569 E .069(gins with)-.15 F F2(/)2.569 E F0 2.569(,a)C .069
(ll matches of)-2.569 F F1(pattern)2.569 E F0 .069(are replaced with)
2.569 F F1(string)2.57 E F0 5.07(.N)C .07
(ormally only the \214rst match is)-5.07 F 2.58(replaced. If)144 405.6 R
F1(pattern)2.58 E F0(be)2.58 E .08(gins with)-.15 F F2(#)2.58 E F0 2.58
(,i)C 2.58(tm)-2.58 G .079(ust match at the be)-2.58 F .079
(ginning of the e)-.15 F .079(xpanded v)-.15 F .079(alue of)-.25 F F1
(par)2.579 E(am-)-.15 E(eter)144 417.6 Q F0 5.761(.I)C(f)-5.761 E F1
(pattern)3.261 E F0(be)3.261 E .761(gins with)-.15 F F2(%)3.261 E F0
3.261(,i)C 3.261(tm)-3.261 G .761(ust match at the end of the e)-3.261 F
.761(xpanded v)-.15 F .761(alue of)-.25 F F1(par)3.262 E(ameter)-.15 E
F0 5.762(.I)C(f)-5.762 E F1(string)144 429.6 Q F0 .958
(is null, matches of)3.458 F F1(pattern)3.458 E F0 .958
(are deleted and the)3.458 F F2(/)3.458 E F0(follo)3.458 E(wing)-.25 E
F1(pattern)3.457 E F0 .957(may be omitted.)3.457 F .957(If the)5.957 F
F2(nocasematch)144 441.6 Q F0 .492
(shell option is enabled, the match is performed without re)2.992 F -.05
(ga)-.15 G .492(rd to the case of alpha-).05 F .884(betic characters.)
144 453.6 R(If)5.884 E F1(par)4.634 E(ameter)-.15 E F0(is)4.114 E F2(@)
3.384 E F0(or)3.383 E F2(*)3.383 E F0 3.383(,t)C .883
(he substitution operation is applied to each positional)-3.383 F 1.002
(parameter in turn, and the e)144 465.6 R 1.002
(xpansion is the resultant list.)-.15 F(If)6.002 E F1(par)4.752 E
(ameter)-.15 E F0 1.002(is an array v)4.232 F 1.002(ariable sub-)-.25 F
.159(scripted with)144 477.6 R F2(@)2.659 E F0(or)2.659 E F2(*)2.659 E
F0 2.659(,t)C .159(he substitution operation is applied to each member \
of the array in turn, and)-2.659 F(the e)144 489.6 Q
(xpansion is the resultant list.)-.15 E(${)108 506.4 Q F1(par)A(ameter)
-.15 E F2(^)A F1(pattern)A F0(})A(${)108 518.4 Q F1(par)A(ameter)-.15 E
F2(^^)A F1(pattern)A F0(})A(${)108 530.4 Q F1(par)A(ameter)-.15 E F2(,)A
F1(pattern)A F0(})A(${)108 542.4 Q F1(par)A(ameter)-.15 E F2(,,)A F1
(pattern)A F0(})A F2 .437(Case modi\214cation)144 554.4 R F0 5.437(.T)C
.437(his e)-5.437 F .438
(xpansion modi\214es the case of alphabetic characters in)-.15 F F1(par)
2.938 E(ameter)-.15 E F0 5.438(.T)C(he)-5.438 E F1(pattern)144 566.4 Q
F0 .374(is e)2.874 F .374
(xpanded to produce a pattern just as in pathname e)-.15 F 2.874
(xpansion. Each)-.15 F .373(character in the e)2.873 F(x-)-.15 E .513
(panded v)144 578.4 R .513(alue of)-.25 F F1(par)3.013 E(ameter)-.15 E
F0 .513(is tested ag)3.013 F(ainst)-.05 E F1(pattern)3.013 E F0 3.013
(,a)C .514(nd, if it matches the pattern, its case is con-)-3.013 F -.15
(ve)144 590.4 S 2.823(rted. The).15 F .323
(pattern should not attempt to match more than one character)2.823 F
5.322(.T)-.55 G(he)-5.322 E F2(^)2.822 E F0 .322(operator con)2.822 F
-.15(ve)-.4 G(rts).15 E(lo)144 602.4 Q .18(wercase letters matching)-.25
F F1(pattern)2.681 E F0 .181(to uppercase; the)2.681 F F2(,)2.681 E F0
.181(operator con)2.681 F -.15(ve)-.4 G .181
(rts matching uppercase letters).15 F .085(to lo)144 614.4 R 2.585
(wercase. The)-.25 F F2(^^)2.585 E F0(and)2.585 E F2(,,)2.585 E F0 -.15
(ex)2.585 G .085(pansions con).15 F -.15(ve)-.4 G .085
(rt each matched character in the e).15 F .085(xpanded v)-.15 F .085
(alue; the)-.25 F F2(^)2.585 E F0(and)144 626.4 Q F2(,)3.59 E F0 -.15
(ex)3.59 G 1.09(pansions match and con).15 F -.15(ve)-.4 G 1.091
(rt only the \214rst character in the e).15 F 1.091(xpanded v)-.15 F
3.591(alue. If)-.25 F F1(pattern)3.591 E F0(is)3.591 E 1.121
(omitted, it is treated lik)144 638.4 R 3.621(ea)-.1 G F2(?)A F0 3.621
(,w)C 1.121(hich matches e)-3.621 F -.15(ve)-.25 G 1.121(ry character)
.15 F 6.12(.I)-.55 G(f)-6.12 E F1(par)4.87 E(ameter)-.15 E F0(is)4.35 E
F2(@)3.62 E F0(or)3.62 E F2(*)3.62 E F0 3.62(,t)C 1.12(he case)-3.62 F
.339(modi\214cation operation is applied to each positional parameter i\
n turn, and the e)144 650.4 R .34(xpansion is the re-)-.15 F .25
(sultant list.)144 662.4 R(If)5.25 E F1(par)4 E(ameter)-.15 E F0 .25
(is an array v)3.48 F .249(ariable subscripted with)-.25 F F2(@)2.749 E
F0(or)2.749 E F2(*)2.749 E F0 2.749(,t)C .249
(he case modi\214cation oper)-2.749 F(-)-.2 E
(ation is applied to each member of the array in turn, and the e)144
674.4 Q(xpansion is the resultant list.)-.15 E(${)108 691.2 Q F1(par)A
(ameter)-.15 E F2(@)A F1(oper)A(ator)-.15 E F0(})A F2 -.1(Pa)144 703.2 S
.86(rameter transf).1 F(ormation)-.25 E F0 5.86(.T)C .86(he e)-5.86 F
.86(xpansion is either a transformation of the v)-.15 F .86(alue of)-.25
F F1(par)3.36 E(ameter)-.15 E F0 .154(or information about)144 715.2 R
F1(par)2.654 E(ameter)-.15 E F0 .153(itself, depending on the v)2.654 F
.153(alue of)-.25 F F1(oper)2.653 E(ator)-.15 E F0 5.153(.E)C(ach)-5.153
E F1(oper)2.653 E(ator)-.15 E F0 .153(is a sin-)2.653 F(gle letter:)144
727.2 Q(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(24)190.395 E 0
Cg EP
%%Page: 25 25
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(U)144 84 Q F0 .142(The e)180 84 R .142
(xpansion is a string that is the v)-.15 F .142(alue of)-.25 F/F2 10
/Times-Italic@0 SF(par)2.642 E(ameter)-.15 E F0 .142(with lo)2.642 F
.143(wercase alphabetic charac-)-.25 F(ters con)180 96 Q -.15(ve)-.4 G
(rted to uppercase.).15 E F1(u)144 108 Q F0 .43(The e)180 108 R .43
(xpansion is a string that is the v)-.15 F .429(alue of)-.25 F F2(par)
2.929 E(ameter)-.15 E F0 .429(with the \214rst character con)2.929 F
-.15(ve)-.4 G(rted).15 E(to uppercase, if it is alphabetic.)180 120 Q F1
(L)144 132 Q F0 .124(The e)180 132 R .124
(xpansion is a string that is the v)-.15 F .124(alue of)-.25 F F2(par)
2.624 E(ameter)-.15 E F0 .125(with uppercase alphabetic charac-)2.625 F
(ters con)180 144 Q -.15(ve)-.4 G(rted to lo).15 E(wercase.)-.25 E F1(Q)
144 156 Q F0 1.065(The e)180 156 R 1.065
(xpansion is a string that is the v)-.15 F 1.065(alue of)-.25 F F2(par)
3.565 E(ameter)-.15 E F0 1.064(quoted in a format that can be)3.565 F
(reused as input.)180 168 Q F1(E)144 180 Q F0 .44(The e)180 180 R .441
(xpansion is a string that is the v)-.15 F .441(alue of)-.25 F F2(par)
2.941 E(ameter)-.15 E F0 .441(with backslash escape sequences)2.941 F
-.15(ex)180 192 S(panded as with the).15 E F1($'...)2.5 E(')-.55 E F0
(quoting mechanism.)2.5 E F1(P)144 204 Q F0 1.073(The e)180 204 R 1.073
(xpansion is a string that is the result of e)-.15 F 1.073
(xpanding the v)-.15 F 1.073(alue of)-.25 F F2(par)3.573 E(ameter)-.15 E
F0 1.073(as if it)3.573 F(were a prompt string \(see)180 216 Q F1(PR)2.5
E(OMPTING)-.3 E F0(belo)2.5 E(w\).)-.25 E F1(A)144 228 Q F0 1.137(The e)
180 228 R 1.138
(xpansion is a string in the form of an assignment statement or)-.15 F
F1(declar)3.638 E(e)-.18 E F0(command)3.638 E(that, if e)180 240 Q -.25
(va)-.25 G(luated, will recreate).25 E F2(par)2.5 E(ameter)-.15 E F0
(with its attrib)2.5 E(utes and v)-.2 E(alue.)-.25 E F1(K)144 252 Q F0
1.34(Produces a possibly-quoted v)180 252 R 1.339(ersion of the v)-.15 F
1.339(alue of)-.25 F F2(par)3.839 E(ameter)-.15 E F0 3.839(,e)C 1.339
(xcept that it prints the)-3.989 F -.25(va)180 264 S .257(lues of inde)
.25 F -.15(xe)-.15 G 2.757(da).15 G .257(nd associati)-2.757 F .557 -.15
(ve a)-.25 H .257(rrays as a sequence of quoted k).15 F -.15(ey)-.1 G
(-v).15 E .257(alue pairs \(see)-.25 F F1(Ar)2.758 E(-)-.37 E(rays)180
276 Q F0(abo)2.5 E -.15(ve)-.15 G(\).).15 E F1(a)144 288 Q F0(The e)180
288 Q(xpansion is a string consisting of \215ag v)-.15 E
(alues representing)-.25 E F2(par)2.5 E(ameter)-.15 E F0 1.1 -.55('s a)D
(ttrib).55 E(utes.)-.2 E(If)144 304.8 Q F2(par)4.403 E(ameter)-.15 E F0
(is)3.883 E F1(@)3.153 E F0(or)3.153 E F1(*)3.153 E F0 3.153(,t)C .653(\
he operation is applied to each positional parameter in turn, and the e)
-3.153 F(x-)-.15 E .403(pansion is the resultant list.)144 316.8 R(If)
5.403 E F2(par)4.153 E(ameter)-.15 E F0 .403(is an array v)3.633 F .403
(ariable subscripted with)-.25 F F1(@)2.903 E F0(or)2.903 E F1(*)2.903 E
F0 2.903(,t)C .403(he opera-)-2.903 F
(tion is applied to each member of the array in turn, and the e)144
328.8 Q(xpansion is the resultant list.)-.15 E .708(The result of the e)
144 352.8 R .708(xpansion is subject to w)-.15 F .708
(ord splitting and pathname e)-.1 F .708(xpansion as described be-)-.15
F(lo)144 364.8 Q -.65(w.)-.25 G F1(Command Substitution)87 381.6 Q F2
1.697(Command substitution)108 393.6 R F0(allo)4.197 E 1.697
(ws the output of a command to replace the command name.)-.25 F 1.698
(There are tw)6.698 F(o)-.1 E(forms:)108 405.6 Q F1($\()144 422.4 Q F2
(command)A F1(\))1.666 E F0(or)108 434.4 Q F1<92>144 446.4 Q F2(command)
A F1<92>A(Bash)108 463.2 Q F0 .089(performs the e)2.589 F .089
(xpansion by e)-.15 F -.15(xe)-.15 G(cuting).15 E F2(command)2.589 E F0
.088(in a subshell en)2.589 F .088(vironment and replacing the command)
-.4 F .41(substitution with the standard output of the command, with an)
108 475.2 R 2.91(yt)-.15 G .41(railing ne)-2.91 F .41(wlines deleted.)
-.25 F .41(Embedded ne)5.41 F(w-)-.25 E .192(lines are not deleted, b)
108 487.2 R .192(ut the)-.2 F 2.692(ym)-.15 G .192(ay be remo)-2.692 F
-.15(ve)-.15 G 2.692(dd).15 G .192(uring w)-2.692 F .192(ord splitting.)
-.1 F .192(The command substitution)5.192 F F1($\(cat)2.691 E F2(\214le)
2.691 E F1(\))A F0(can be replaced by the equi)108 499.2 Q -.25(va)-.25
G(lent b).25 E(ut f)-.2 E(aster)-.1 E F1($\(<)2.5 E F2(\214le)2.5 E F1
(\))A F0(.)A 1.724(When the old-style backquote form of substitution is\
 used, backslash retains its literal meaning e)108 516 R(xcept)-.15 E
.315(when follo)108 528 R .315(wed by)-.25 F F1($)2.815 E F0(,)A F1<92>
2.815 E F0 2.815(,o)C(r)-2.815 E F1(\\)2.815 E F0 5.315(.T)C .314(he \
\214rst backquote not preceded by a backslash terminates the command su\
b-)-5.315 F 3.886(stitution. When)108 540 R 1.386(using the $\()3.886 F
F2(command).833 E F0 3.886(\)f)1.666 G 1.387
(orm, all characters between the parentheses mak)-3.886 F 3.887(eu)-.1 G
3.887(pt)-3.887 G 1.387(he com-)-3.887 F
(mand; none are treated specially)108 552 Q(.)-.65 E .894
(Command substitutions may be nested.)108 568.8 R 2.494 -.8(To n)5.894 H
.894(est when using the backquoted form, escape the inner back-).8 F
(quotes with backslashes.)108 580.8 Q .422
(If the substitution appears within double quotes, w)108 597.6 R .422
(ord splitting and pathname e)-.1 F .423(xpansion are not performed)-.15
F(on the results.)108 609.6 Q F1(Arithmetic Expansion)87 626.4 Q F0
1.035(Arithmetic e)108 638.4 R 1.035(xpansion allo)-.15 F 1.035
(ws the e)-.25 F -.25(va)-.25 G 1.034(luation of an arithmetic e).25 F
1.034(xpression and the substitution of the result.)-.15 F
(The format for arithmetic e)108 650.4 Q(xpansion is:)-.15 E F1($\(\()
144 667.2 Q F2 -.2(ex)C(pr).2 E(ession)-.37 E F1(\)\))A F0(The)108 684 Q
F2 -.2(ex)2.665 G(pr).2 E(ession)-.37 E F0 .165
(is treated as if it were within double quotes, b)2.905 F .166
(ut a double quote inside the parentheses is not)-.2 F .231
(treated specially)108 696 R 5.231(.A)-.65 G .231(ll tok)-5.231 F .231
(ens in the e)-.1 F .231(xpression under)-.15 F .231(go parameter and v)
-.18 F .23(ariable e)-.25 F .23(xpansion, command substi-)-.15 F .048
(tution, and quote remo)108 708 R -.25(va)-.15 G 2.548(l. The).25 F .048
(result is treated as the arithmetic e)2.548 F .048(xpression to be e)
-.15 F -.25(va)-.25 G 2.549(luated. Arithmetic).25 F -.15(ex)2.549 G(-)
.15 E(pansions may be nested.)108 720 Q(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(25)190.395 E 0 Cg EP
%%Page: 26 26
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E 1.379(The e)108 84
R -.25(va)-.25 G 1.378
(luation is performed according to the rules listed belo).25 F 3.878(wu)
-.25 G(nder)-3.878 E/F1 9/Times-Bold@0 SF 1.378(ARITHMETIC EV)3.878 F
(ALU)-1.215 E -.855(AT)-.54 G(ION).855 E/F2 9/Times-Roman@0 SF(.)A F0
(If)5.878 E/F3 10/Times-Italic@0 SF -.2(ex)108 96 S(pr).2 E(ession)-.37
E F0(is in)2.74 E -.25(va)-.4 G(lid,).25 E/F4 10/Times-Bold@0 SF(bash)
2.5 E F0(prints a message indicating f)2.5 E
(ailure and no substitution occurs.)-.1 E F4(Pr)87 112.8 Q
(ocess Substitution)-.18 E F3(Pr)108 124.8 Q .405(ocess substitution)
-.45 F F0(allo)2.905 E .405(ws a process')-.25 F 2.905(si)-.55 G .405
(nput or output to be referred to using a \214lename.)-2.905 F .405
(It tak)5.405 F .405(es the form)-.1 F(of)108 136.8 Q F4(<\()3.251 E F3
(list)A F4(\)).833 E F0(or)3.251 E F4(>\()3.251 E F3(list)A F4(\)).833 E
F0 5.751(.T)C .751(he process)-5.751 F F3(list)3.251 E F0 .751
(is run asynchronously)3.251 F 3.251(,a)-.65 G .751
(nd its input or output appears as a \214lename.)-3.251 F .147
(This \214lename is passed as an ar)108 148.8 R .148
(gument to the current command as the result of the e)-.18 F 2.648
(xpansion. If)-.15 F(the)2.648 E F4(>\()2.648 E F3(list)A F4(\)).833 E
F0 .56(form is used, writing to the \214le will pro)108 160.8 R .56
(vide input for)-.15 F F3(list)3.059 E F0 5.559(.I)C 3.059(ft)-5.559 G
(he)-3.059 E F4(<\()3.059 E F3(list)A F4(\)).833 E F0 .559
(form is used, the \214le passed as an)3.059 F(ar)108 172.8 Q .308
(gument should be read to obtain the output of)-.18 F F3(list)2.808 E F0
5.308(.P)C .309(rocess substitution is supported on systems that sup-)
-5.308 F(port named pipes \()108 184.8 Q F3(FIFOs)A F0 2.5(\)o)C 2.5(rt)
-2.5 G(he)-2.5 E F4(/de)2.5 E(v/fd)-.15 E F0
(method of naming open \214les.)2.5 E .897(When a)108 201.6 R -.25(va)
-.2 G .896(ilable, process substitution is performed simultaneously wit\
h parameter and v).25 F .896(ariable e)-.25 F(xpansion,)-.15 E
(command substitution, and arithmetic e)108 213.6 Q(xpansion.)-.15 E F4
-.75(Wo)87 230.4 S(rd Splitting).75 E F0 1.142
(The shell scans the results of parameter e)108 242.4 R 1.143
(xpansion, command substitution, and arithmetic e)-.15 F 1.143
(xpansion that)-.15 F(did not occur within double quotes for)108 254.4 Q
F3(wor)2.84 E 2.5(ds)-.37 G(plitting)-2.5 E F0(.).22 E .063
(The shell treats each character of)108 271.2 R F1(IFS)2.563 E F0 .063
(as a delimiter)2.313 F 2.563(,a)-.4 G .063
(nd splits the results of the other e)-2.563 F .063(xpansions into w)
-.15 F(ords)-.1 E .207(using these characters as \214eld terminators.)
108 283.2 R(If)5.207 E F1(IFS)2.707 E F0 .207(is unset, or its v)2.457 F
.207(alue is e)-.25 F(xactly)-.15 E F4(<space><tab><newline>)2.708 E F0
(,)A .837(the def)108 295.2 R .837(ault, then sequences of)-.1 F F4
(<space>)3.337 E F0(,)A F4(<tab>)3.337 E F0 3.337(,a)C(nd)-3.337 E F4
(<newline>)3.337 E F0 .836(at the be)3.336 F .836
(ginning and end of the results of)-.15 F .345(the pre)108 307.2 R .345
(vious e)-.25 F .345(xpansions are ignored, and an)-.15 F 2.845(ys)-.15
G .345(equence of)-2.845 F F1(IFS)2.845 E F0 .345
(characters not at the be)2.595 F .345(ginning or end serv)-.15 F(es)
-.15 E 1.237(to delimit w)108 319.2 R 3.737(ords. If)-.1 F F1(IFS)3.737
E F0 1.236(has a v)3.486 F 1.236(alue other than the def)-.25 F 1.236
(ault, then sequences of the whitespace characters)-.1 F F4(space)108
331.2 Q F0(,)A F4(tab)2.506 E F0 2.506(,a)C(nd)-2.506 E F4(newline)2.506
E F0 .006(are ignored at the be)2.506 F .006(ginning and end of the w)
-.15 F .007(ord, as long as the whitespace charac-)-.1 F .921
(ter is in the v)108 343.2 R .92(alue of)-.25 F F1(IFS)3.42 E F0(\(an)
3.17 E F1(IFS)3.42 E F0 .92(whitespace character\).)3.17 F(An)5.92 E
3.42(yc)-.15 G .92(haracter in)-3.42 F F1(IFS)3.42 E F0 .92(that is not)
3.17 F F1(IFS)3.42 E F0(whitespace,)3.17 E .428(along with an)108 355.2
R 2.928(ya)-.15 G(djacent)-2.928 E F1(IFS)2.928 E F0 .428
(whitespace characters, delimits a \214eld.)2.678 F 2.928(As)5.428 G
.428(equence of)-2.928 F F1(IFS)2.928 E F0 .429(whitespace charac-)2.679
F(ters is also treated as a delimiter)108 367.2 Q 5(.I)-.55 G 2.5(ft)-5
G(he v)-2.5 E(alue of)-.25 E F1(IFS)2.5 E F0(is null, no w)2.25 E
(ord splitting occurs.)-.1 E .783(Explicit null ar)108 384 R .783
(guments \()-.18 F F4 .833("").833 G F0(or)2.449 E F4 .833<0808>4.115 G
F0 3.282(\)a)C .782
(re retained and passed to commands as empty strings.)-3.282 F .782
(Unquoted im-)5.782 F .178(plicit null ar)108 396 R .179
(guments, resulting from the e)-.18 F .179
(xpansion of parameters that ha)-.15 F .479 -.15(ve n)-.2 H 2.679(ov).15
G .179(alues, are remo)-2.929 F -.15(ve)-.15 G 2.679(d. If).15 F 2.679
(ap)2.679 G(a-)-2.679 E .319(rameter with no v)108 408 R .319(alue is e)
-.25 F .319(xpanded within double quotes, a null ar)-.15 F .319
(gument results and is retained and passed)-.18 F
(to a command as an empty string.)108 420 Q(When a quoted null ar)5 E
.001(gument appears as part of a w)-.18 F .001(ord whose e)-.1 F
(xpansion)-.15 E .984(is non-null, the null ar)108 432 R .984
(gument is remo)-.18 F -.15(ve)-.15 G 3.483(d. That).15 F .983
(is, the w)3.483 F(ord)-.1 E/F5 10/Courier@0 SF -5.167<ad64082008>3.483
F F0(becomes)3.483 E F5<ad64>3.483 E F0 .983(after w)3.483 F .983
(ord splitting and)-.1 F(null ar)108 444 Q(gument remo)-.18 E -.25(va)
-.15 G(l.).25 E(Note that if no e)108 460.8 Q
(xpansion occurs, no splitting is performed.)-.15 E F4 -.1(Pa)87 477.6 S
(thname Expansion).1 E F0 .37(After w)108 489.6 R .37
(ord splitting, unless the)-.1 F F4<ad66>2.87 E F0 .37
(option has been set,)2.87 F F4(bash)2.87 E F0 .371(scans each w)2.871 F
.371(ord for the characters)-.1 F F4(*)2.871 E F0(,)A F4(?)2.871 E F0
2.871(,a)C(nd)-2.871 E F4([)2.871 E F0(.)A .634
(If one of these characters appears, and is not quoted, then the w)108
501.6 R .634(ord is re)-.1 F -.05(ga)-.15 G .633(rded as a).05 F F3
(pattern)4.383 E F0 3.133(,a).24 G .633(nd replaced)-3.133 F 1.34(with \
an alphabetically sorted list of \214lenames matching the pattern \(see)
108 513.6 R F1 -.09(Pa)3.84 G(tter).09 E 3.59(nM)-.135 G(atching)-3.59 E
F0(belo)3.59 E 3.84(w\). If)-.25 F(no)3.84 E .534
(matching \214lenames are found, and the shell option)108 525.6 R F4
(nullglob)3.034 E F0 .534(is not enabled, the w)3.034 F .534
(ord is left unchanged.)-.1 F(If)5.534 E(the)108 537.6 Q F4(nullglob)
3.284 E F0 .785(option is set, and no matches are found, the w)3.284 F
.785(ord is remo)-.1 F -.15(ve)-.15 G 3.285(d. If).15 F(the)3.285 E F4
(failglob)3.285 E F0 .785(shell option is)3.285 F .754(set, and no matc\
hes are found, an error message is printed and the command is not e)108
549.6 R -.15(xe)-.15 G 3.254(cuted. If).15 F .754(the shell)3.254 F
(option)108 561.6 Q F4(nocaseglob)3.263 E F0 .763
(is enabled, the match is performed without re)3.263 F -.05(ga)-.15 G
.764(rd to the case of alphabetic characters.).05 F .039
(When a pattern is used for pathname e)108 573.6 R .039
(xpansion, the character)-.15 F F4 -.63(``)2.539 G -.55(.').63 G(')-.08
E F0 .039(at the start of a name or immediately fol-)5.039 F(lo)108
585.6 Q .81(wing a slash must be matched e)-.25 F(xplicitly)-.15 E 3.31
(,u)-.65 G .81(nless the shell option)-3.31 F F4(dotglob)3.31 E F0 .81
(is set.)3.31 F .81(The \214lenames)5.81 F F4 -.63(``)3.31 G -.55(.').63
G(')-.08 E F0(and)5.81 E F4 -.63(``)108 597.6 S(..).63 E -.63('')-.55 G
F0 1.182(must al)6.812 F -.1(wa)-.1 G 1.182(ys be matched e).1 F
(xplicitly)-.15 E 3.682(,e)-.65 G -.15(ve)-3.932 G 3.682(ni).15 G(f)
-3.682 E F4(dotglob)3.682 E F0 1.182(is set.)3.682 F 1.181
(In other cases, the)6.182 F F4 -.63(``)3.681 G -.55(.').63 G(')-.08 E
F0 1.181(character is not)6.181 F .613(treated specially)108 609.6 R
5.613(.W)-.65 G .613
(hen matching a pathname, the slash character must al)-5.613 F -.1(wa)
-.1 G .614(ys be matched e).1 F .614(xplicitly by a)-.15 F .655
(slash in the pattern, b)108 621.6 R .655(ut in other matching conte)-.2
F .655(xts it can be matched by a special pattern character as de-)-.15
F .719(scribed belo)108 633.6 R 3.219(wu)-.25 G(nder)-3.219 E F1 -.09
(Pa)3.219 G(tter).09 E 2.969(nM)-.135 G(atching)-2.969 E F2(.)A F0 .719
(See the description of)5.219 F F4(shopt)3.219 E F0(belo)3.219 E 3.22
(wu)-.25 G(nder)-3.22 E F1 .72(SHELL B)3.22 F(UIL)-.09 E .72(TIN COM-)
-.828 F(MANDS)108 645.6 Q F0(for a description of the)2.25 E F4
(nocaseglob)2.5 E F0(,)A F4(nullglob)2.5 E F0(,)A F4(failglob)2.5 E F0
2.5(,a)C(nd)-2.5 E F4(dotglob)2.5 E F0(shell options.)2.5 E(The)108
662.4 Q F1(GLOBIGNORE)2.562 E F0 .062(shell v)2.312 F .061
(ariable may be used to restrict the set of \214le names matching a)-.25
F F3(pattern)3.811 E F0 5.061(.I).24 G(f)-5.061 E F1(GLO-)2.561 E
(BIGNORE)108 674.4 Q F0 1.096(is set, each matching \214le name that al\
so matches one of the patterns in)3.346 F F1(GLOBIGNORE)3.597 E F0 1.097
(is re-)3.347 F(mo)108 686.4 Q -.15(ve)-.15 G 2.851(df).15 G .351
(rom the list of matches.)-2.851 F .351(If the)5.351 F F4(nocaseglob)
2.851 E F0 .351(option is set, the matching ag)2.851 F .351
(ainst the patterns in)-.05 F F1(GLO-)2.85 E(BIGNORE)108 698.4 Q F0 1.48
(is performed without re)3.73 F -.05(ga)-.15 G 1.48(rd to case.).05 F
1.48(The \214lenames)6.48 F F4 -.63(``)3.98 G -.55(.').63 G(')-.08 E F0
(and)6.48 E F4 -.63(``)3.98 G(..).63 E -.63('')-.55 G F0 1.481(are al)
7.11 F -.1(wa)-.1 G 1.481(ys ignored when).1 F F1(GLOBIGNORE)108 710.4 Q
F0 .827(is set and not null.)3.077 F(Ho)5.827 E(we)-.25 E -.15(ve)-.25 G
1.627 -.4(r, s).15 H(etting).4 E F1(GLOBIGNORE)3.327 E F0 .827
(to a non-null v)3.077 F .827(alue has the ef)-.25 F .827(fect of)-.25 F
.682(enabling the)108 722.4 R F4(dotglob)3.182 E F0 .682
(shell option, so all other \214lenames be)3.182 F .682(ginning with a)
-.15 F F4 -.63(``)3.182 G -.55(.').63 G(')-.08 E F0 .682(will match.)
5.682 F 2.283 -.8(To g)5.683 H .683(et the old).8 F(GNU Bash 5.1)72 768
Q(2020 October 29)141.235 E(26)190.395 E 0 Cg EP
%%Page: 27 27
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(beha)108 84 Q
1.185(vior of ignoring \214lenames be)-.2 F 1.185(ginning with a)-.15 F
/F1 10/Times-Bold@0 SF -.63(``)3.684 G -.55(.').63 G(')-.08 E F0 3.684
(,m)C(ak)-3.684 E(e)-.1 E F1 -.63(``)3.684 G(.*').63 E(')-.63 E F0 1.184
(one of the patterns in)6.184 F/F2 9/Times-Bold@0 SF(GLOBIGNORE)3.684 E
/F3 9/Times-Roman@0 SF(.)A F0(The)108 96 Q F1(dotglob)3.131 E F0 .631
(option is disabled when)3.131 F F2(GLOBIGNORE)3.132 E F0 .632
(is unset.)2.882 F .632(The pattern matching honors the setting of)5.632
F(the)108 108 Q F1(extglob)2.5 E F0(shell option.)2.5 E F1 -.1(Pa)108
124.8 S(tter).1 E 2.5(nM)-.15 G(atching)-2.5 E F0(An)108 141.6 Q 3.138
(yc)-.15 G .638(haracter that appears in a pattern, other than the spec\
ial pattern characters described belo)-3.138 F 1.938 -.65(w, m)-.25 H
(atches).65 E 2.721(itself. The)108 153.6 R .221
(NUL character may not occur in a pattern.)2.721 F 2.721(Ab)5.221 G .221
(ackslash escapes the follo)-2.721 F .222(wing character; the es-)-.25 F
.418(caping backslash is discarded when matching.)108 165.6 R .418
(The special pattern characters must be quoted if the)5.418 F 2.918(ya)
-.15 G .418(re to)-2.918 F(be matched literally)108 177.6 Q(.)-.65 E
(The special pattern characters ha)108 194.4 Q .3 -.15(ve t)-.2 H
(he follo).15 E(wing meanings:)-.25 E F1(*)144 211.2 Q F0 .376
(Matches an)180 211.2 R 2.876(ys)-.15 G .376
(tring, including the null string.)-2.876 F .376(When the)5.376 F F1
(globstar)2.876 E F0 .377(shell option is enabled,)2.876 F(and)180 223.2
Q F1(*)3.275 E F0 .775(is used in a pathname e)3.275 F .775
(xpansion conte)-.15 F .775(xt, tw)-.15 F 3.275(oa)-.1 G(djacent)-3.275
E F1(*)3.275 E F0 3.275(su)C .775(sed as a single pattern)-3.275 F 1.058
(will match all \214les and zero or more directories and subdirectories\
.)180 235.2 R 1.058(If follo)6.058 F 1.058(wed by a)-.25 F F1(/)3.558 E
F0(,)A(tw)180 247.2 Q 2.5(oa)-.1 G(djacent)-2.5 E F1(*)2.5 E F0 2.5(sw)C
(ill match only directories and subdirectories.)-2.5 E F1(?)144 259.2 Q
F0(Matches an)180 259.2 Q 2.5(ys)-.15 G(ingle character)-2.5 E(.)-.55 E
F1([...])144 271.2 Q F0 .579(Matches an)180 271.2 R 3.079(yo)-.15 G .579
(ne of the enclosed characters.)-3.079 F 3.079(Ap)5.579 G .578
(air of characters separated by a h)-3.079 F(yphen)-.05 E .684
(denotes a)180 283.2 R/F4 10/Times-Italic@0 SF -.15(ra)3.184 G(ng).15 E
3.184(ee)-.1 G(xpr)-3.384 E(ession)-.37 E F0 3.184(;a)C .984 -.15(ny c)
-3.184 H .684(haracter that f).15 F .684(alls between those tw)-.1 F
3.185(oc)-.1 G .685(haracters, inclu-)-3.185 F(si)180 295.2 Q -.15(ve)
-.25 G 3.713(,u).15 G 1.213(sing the current locale')-3.713 F 3.712(sc)
-.55 G 1.212(ollating sequence and character set, is matched.)-3.712 F
1.212(If the)6.212 F 1.123(\214rst character follo)180 307.2 R 1.123
(wing the)-.25 F F1([)3.623 E F0 1.123(is a)3.623 F F1(!)3.623 E F0
1.124(or a)6.123 F F1(^)3.624 E F0 1.124(then an)3.624 F 3.624(yc)-.15 G
1.124(haracter not enclosed is matched.)-3.624 F .895
(The sorting order of characters in range e)180 319.2 R .894
(xpressions is determined by the current locale)-.15 F .375(and the v)
180 331.2 R .375(alues of the)-.25 F F2(LC_COLLA)2.875 E(TE)-.855 E F0
(or)2.625 E F2(LC_ALL)2.875 E F0 .375(shell v)2.625 F .375
(ariables, if set.)-.25 F 1.976 -.8(To o)5.376 H .376(btain the tra-).8
F .068(ditional interpretation of range e)180 343.2 R .068
(xpressions, where)-.15 F F1([a\255d])2.568 E F0 .067(is equi)2.567 F
-.25(va)-.25 G .067(lent to).25 F F1([abcd])2.567 E F0 2.567(,s)C .067
(et v)-2.567 F(alue)-.25 E .156(of the)180 355.2 R F1(LC_ALL)2.656 E F0
.156(shell v)2.656 F .156(ariable to)-.25 F F1(C)2.657 E F0 2.657(,o)C
2.657(re)-2.657 G .157(nable the)-2.657 F F1(globasciiranges)2.657 E F0
.157(shell option.)2.657 F(A)5.157 E F1<ad>2.657 E F0(may)2.657 E .193(\
be matched by including it as the \214rst or last character in the set.)
180 367.2 R(A)5.193 E F1(])2.693 E F0 .193(may be matched by)2.693 F
(including it as the \214rst character in the set.)180 379.2 Q -.4(Wi)
180 397.2 S(thin).4 E F1([)3.07 E F0(and)3.07 E F1(])3.07 E F0(,)A F4
-.15(ch)3.07 G(ar).15 E .571(acter classes)-.15 F F0 .571
(can be speci\214ed using the syntax)3.071 F F1([:)3.071 E F4(class)A F1
(:])A F0 3.071(,w)C(here)-3.071 E F4(class)3.071 E F0
(is one of the follo)180 409.2 Q
(wing classes de\214ned in the POSIX standard:)-.25 E F1 5.889
(alnum alpha ascii blank cntrl digit graph lo)180 421.2 R 5.889
(wer print punct space up-)-.1 F 5(per w)180 433.2 R 5(ord xdigit)-.1 F
F0 4.289(Ac)180 445.2 S 1.789(haracter class matches an)-4.289 F 4.289
(yc)-.15 G 1.789(haracter belonging to that class.)-4.289 F(The)6.789 E
F1 -.1(wo)4.29 G(rd).1 E F0(character)4.29 E
(class matches letters, digits, and the character _.)180 457.2 Q -.4(Wi)
180 475.2 S(thin).4 E F1([)4.537 E F0(and)4.537 E F1(])4.537 E F0 4.537
(,a)C(n)-4.537 E F4 2.037(equivalence class)4.537 F F0 2.036
(can be speci\214ed using the syntax)4.536 F F1([=)4.536 E F4(c)A F1(=])
A F0 4.536(,w)C(hich)-4.536 E .125(matches all characters with the same\
 collation weight \(as de\214ned by the current locale\) as)180 487.2 R
(the character)180 499.2 Q F4(c)2.5 E F0(.)A -.4(Wi)180 517.2 S(thin).4
E F1([)2.5 E F0(and)2.5 E F1(])2.5 E F0 2.5(,t)C(he syntax)-2.5 E F1([.)
2.5 E F4(symbol)A F1(.])A F0(matches the collating symbol)2.5 E F4
(symbol)2.5 E F0(.)A .705(If the)108 534 R F1(extglob)3.205 E F0 .705
(shell option is enabled using the)3.205 F F1(shopt)3.205 E F0 -.2(bu)
3.205 G .704(iltin, se).2 F -.15(ve)-.25 G .704(ral e).15 F .704
(xtended pattern matching operators)-.15 F .255(are recognized.)108 546
R .255(In the follo)5.255 F .255(wing description, a)-.25 F F4
(pattern-list)2.755 E F0 .255
(is a list of one or more patterns separated by a)2.755 F F1(|)2.756 E
F0(.)A(Composite patterns may be formed using one or more of the follo)
108 558 Q(wing sub-patterns:)-.25 E F1(?\()144 582 Q F4(pattern-list)
.833 E F1(\)).833 E F0(Matches zero or one occurrence of the gi)180 594
Q -.15(ve)-.25 G 2.5(np).15 G(atterns)-2.5 E F1(*\()144 606 Q F4
(pattern-list).833 E F1(\)).833 E F0
(Matches zero or more occurrences of the gi)180 618 Q -.15(ve)-.25 G 2.5
(np).15 G(atterns)-2.5 E F1(+\()144 630 Q F4(pattern-list).833 E F1(\))
.833 E F0(Matches one or more occurrences of the gi)180 642 Q -.15(ve)
-.25 G 2.5(np).15 G(atterns)-2.5 E F1(@\()144 654 Q F4(pattern-list).833
E F1(\)).833 E F0(Matches one of the gi)180 666 Q -.15(ve)-.25 G 2.5(np)
.15 G(atterns)-2.5 E F1(!\()144 678 Q F4(pattern-list).833 E F1(\)).833
E F0(Matches an)180 690 Q(ything e)-.15 E(xcept one of the gi)-.15 E
-.15(ve)-.25 G 2.5(np).15 G(atterns)-2.5 E .969(Complicated e)108 706.8
R .969(xtended pattern matching ag)-.15 F .969
(ainst long strings is slo)-.05 F 2.268 -.65(w, e)-.25 H .968
(specially when the patterns contain).65 F .09
(alternations and the strings contain multiple matches.)108 718.8 R .091
(Using separate matches ag)5.091 F .091(ainst shorter strings, or us-)
-.05 F(ing arrays of strings instead of a single long string, may be f)
108 730.8 Q(aster)-.1 E(.)-.55 E(GNU Bash 5.1)72 768 Q(2020 October 29)
141.235 E(27)190.395 E 0 Cg EP
%%Page: 28 28
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(Quote Remo)87 84 Q -.1(va)-.1 G(l).1 E F0 1.113
(After the preceding e)108 96 R 1.113
(xpansions, all unquoted occurrences of the characters)-.15 F F1(\\)
3.613 E F0(,)A F1<08>3.612 E F0 3.612(,a)C(nd)-3.612 E F1(")4.445 E F0
1.112(that did not result)4.445 F(from one of the abo)108 108 Q .3 -.15
(ve ex)-.15 H(pansions are remo).15 E -.15(ve)-.15 G(d.).15 E/F2 10.95
/Times-Bold@0 SF(REDIRECTION)72 124.8 Q F0 .545(Before a command is e)
108 136.8 R -.15(xe)-.15 G .545(cuted, its input and output may be).15 F
/F3 10/Times-Italic@0 SF -.37(re)3.045 G(dir).37 E(ected)-.37 E F0 .545
(using a special notation interpreted)3.815 F .405(by the shell.)108
148.8 R .405(Redirection allo)5.405 F .405(ws commands' \214le handles \
to be duplicated, opened, closed, made to refer to)-.25 F(dif)108 160.8
Q 1.019(ferent \214les, and can change the \214les the command reads fr\
om and writes to.)-.25 F 1.02(Redirection may also be)6.02 F .215
(used to modify \214le handles in the current shell e)108 172.8 R -.15
(xe)-.15 G .215(cution en).15 F 2.715(vironment. The)-.4 F(follo)2.715 E
.215(wing redirection operators)-.25 F .862(may precede or appear an)108
184.8 R .862(ywhere within a)-.15 F F3 .862(simple command)3.702 F F0
.862(or may follo)4.132 F 3.362(wa)-.25 G F3(command).2 E F0 5.862(.R)
.77 G .862(edirections are)-5.862 F(processed in the order the)108 196.8
Q 2.5(ya)-.15 G(ppear)-2.5 E 2.5(,f)-.4 G(rom left to right.)-2.5 E .771
(Each redirection that may be preceded by a \214le descriptor number ma\
y instead be preceded by a w)108 213.6 R .771(ord of)-.1 F .292
(the form {)108 225.6 R F3(varname)A F0 2.793(}. In)B .293
(this case, for each redirection operator e)2.793 F .293
(xcept >&- and <&-, the shell will allocate)-.15 F 3.18<618c>108 237.6 S
.679(le descriptor greater than or equal to 10 and assign it to)-3.18 F
F3(varname)3.179 E F0 5.679(.I)C 3.179(f>)-5.679 G .679
(&- or <&- is preceded by {)-3.179 F F3(var)A(-)-.2 E(name)108 249.6 Q
F0 .599(}, the v)B .599(alue of)-.25 F F3(varname)3.099 E F0 .599
(de\214nes the \214le descriptor to close.)3.099 F .6(If {)5.6 F F3
(varname)A F0 3.1(}i)C 3.1(ss)-3.1 G .6(upplied, the redirection)-3.1 F
1.238(persists be)108 261.6 R 1.238(yond the scope of the command, allo)
-.15 F 1.238(wing the shell programmer to manage the \214le descriptor)
-.25 F(himself.)108 273.6 Q .283(In the follo)108 290.4 R .284(wing des\
criptions, if the \214le descriptor number is omitted, and the \214rst \
character of the redirect-)-.25 F .513(ion operator is)108 302.4 R F1(<)
3.012 E F0 3.012(,t)C .512
(he redirection refers to the standard input \(\214le descriptor 0\).)
-3.012 F .512(If the \214rst character of the)5.512 F
(redirection operator is)108 314.4 Q F1(>)2.5 E F0 2.5(,t)C
(he redirection refers to the standard output \(\214le descriptor 1\).)
-2.5 E .824(The w)108 331.2 R .824(ord follo)-.1 F .824
(wing the redirection operator in the follo)-.25 F .825
(wing descriptions, unless otherwise noted, is sub-)-.25 F .463
(jected to brace e)108 343.2 R .463(xpansion, tilde e)-.15 F .462
(xpansion, parameter and v)-.15 F .462(ariable e)-.25 F .462
(xpansion, command substitution, arith-)-.15 F .866(metic e)108 355.2 R
.866(xpansion, quote remo)-.15 F -.25(va)-.15 G .866(l, pathname e).25 F
.867(xpansion, and w)-.15 F .867(ord splitting.)-.1 F .867(If it e)5.867
F .867(xpands to more than one)-.15 F -.1(wo)108 367.2 S(rd,).1 E F1
(bash)2.5 E F0(reports an error)2.5 E(.)-.55 E
(Note that the order of redirections is signi\214cant.)108 384 Q -.15
(Fo)5 G 2.5(re).15 G(xample, the command)-2.65 E(ls)144 400.8 Q F1(>)2.5
E F0(dirlist 2)2.5 E F1(>&)A F0(1)A
(directs both standard output and standard error to the \214le)108 417.6
Q F3(dirlist)2.85 E F0 2.5(,w).68 G(hile the command)-2.5 E(ls 2)144
434.4 Q F1(>&)A F0(1)A F1(>)2.5 E F0(dirlist)2.5 E .505
(directs only the standard output to \214le)108 451.2 R F3(dirlist)3.355
E F0 3.005(,b).68 G .505(ecause the standard error w)-3.005 F .505
(as duplicated from the standard)-.1 F
(output before the standard output w)108 463.2 Q(as redirected to)-.1 E
F3(dirlist)2.85 E F0(.).68 E F1(Bash)108 480 Q F0 .598(handles se)3.098
F -.15(ve)-.25 G .598(ral \214lenames specially when the).15 F 3.099(ya)
-.15 G .599(re used in redirections, as described in the follo)-3.099 F
(wing)-.25 E 3.478(table. If)108 492 R .978
(the operating system on which)3.478 F F1(bash)3.478 E F0 .978
(is running pro)3.478 F .977
(vides these special \214les, bash will use them;)-.15 F
(otherwise it will emulate them internally with the beha)108 504 Q
(vior described belo)-.2 E -.65(w.)-.25 G F1(/de)144 520.8 Q(v/fd/)-.15
E F3(fd)A F0(If)180 532.8 Q F3(fd)2.5 E F0(is a v)2.5 E(alid inte)-.25 E
(ger)-.15 E 2.5<2c8c>-.4 G(le descriptor)-2.5 E F3(fd)2.5 E F0
(is duplicated.)2.5 E F1(/de)144 544.8 Q(v/stdin)-.15 E F0
(File descriptor 0 is duplicated.)180 556.8 Q F1(/de)144 568.8 Q
(v/stdout)-.15 E F0(File descriptor 1 is duplicated.)180 580.8 Q F1(/de)
144 592.8 Q(v/stderr)-.15 E F0(File descriptor 2 is duplicated.)180
604.8 Q F1(/de)144 616.8 Q(v/tcp/)-.15 E F3(host)A F1(/)A F3(port)A F0
(If)180 628.8 Q F3(host)2.996 E F0 .496(is a v)2.996 F .496
(alid hostname or Internet address, and)-.25 F F3(port)2.997 E F0 .497
(is an inte)2.997 F .497(ger port number or ser)-.15 F(-)-.2 E
(vice name,)180 640.8 Q F1(bash)2.5 E F0
(attempts to open the corresponding TCP sock)2.5 E(et.)-.1 E F1(/de)144
652.8 Q(v/udp/)-.15 E F3(host)A F1(/)A F3(port)A F0(If)180 664.8 Q F3
(host)2.997 E F0 .497(is a v)2.997 F .497
(alid hostname or Internet address, and)-.25 F F3(port)2.996 E F0 .496
(is an inte)2.996 F .496(ger port number or ser)-.15 F(-)-.2 E
(vice name,)180 676.8 Q F1(bash)2.5 E F0
(attempts to open the corresponding UDP sock)2.5 E(et.)-.1 E 2.5(Af)108
693.6 S(ailure to open or create a \214le causes the redirection to f)
-2.6 E(ail.)-.1 E .045(Redirections using \214le descriptors greater th\
an 9 should be used with care, as the)108 710.4 R 2.546(ym)-.15 G .046
(ay con\215ict with \214le de-)-2.546 F
(scriptors the shell uses internally)108 722.4 Q(.)-.65 E(GNU Bash 5.1)
72 768 Q(2020 October 29)141.235 E(28)190.395 E 0 Cg EP
%%Page: 29 29
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(Redir)87 84 Q(ecting Input)-.18 E F0 .391
(Redirection of input causes the \214le whose name results from the e)
108 96 R .391(xpansion of)-.15 F/F2 10/Times-Italic@0 SF(wor)3.231 E(d)
-.37 E F0 .391(to be opened for read-)3.661 F(ing on \214le descriptor)
108 108 Q F2(n)2.86 E F0 2.5(,o).24 G 2.5(rt)-2.5 G
(he standard input \(\214le descriptor 0\) if)-2.5 E F2(n)2.86 E F0
(is not speci\214ed.)2.74 E
(The general format for redirecting input is:)108 124.8 Q([)144 141.6 Q
F2(n)A F0(])A F1(<)A F2(wor)A(d)-.37 E F1(Redir)87 158.4 Q
(ecting Output)-.18 E F0 .174
(Redirection of output causes the \214le whose name results from the e)
108 170.4 R .175(xpansion of)-.15 F F2(wor)3.015 E(d)-.37 E F0 .175
(to be opened for writ-)3.445 F .084(ing on \214le descriptor)108 182.4
R F2(n)2.944 E F0 2.583(,o).24 G 2.583(rt)-2.583 G .083
(he standard output \(\214le descriptor 1\) if)-2.583 F F2(n)2.943 E F0
.083(is not speci\214ed.)2.823 F .083(If the \214le does not e)5.083 F
(x-)-.15 E(ist it is created; if it does e)108 194.4 Q
(xist it is truncated to zero size.)-.15 E
(The general format for redirecting output is:)108 211.2 Q([)144 228 Q
F2(n)A F0(])A F1(>)A F2(wor)A(d)-.37 E F0 .154
(If the redirection operator is)108 244.8 R F1(>)2.654 E F0 2.654(,a)C
.154(nd the)-2.654 F F1(noclob)2.654 E(ber)-.1 E F0 .154(option to the)
2.654 F F1(set)2.655 E F0 -.2(bu)2.655 G .155
(iltin has been enabled, the redirection).2 F .658(will f)108 256.8 R
.658(ail if the \214le whose name results from the e)-.1 F .658
(xpansion of)-.15 F F2(wor)3.158 E(d)-.37 E F0 -.15(ex)3.158 G .657
(ists and is a re).15 F .657(gular \214le.)-.15 F .657(If the redi-)
5.657 F .408(rection operator is)108 268.8 R F1(>|)2.909 E F0 2.909(,o)C
2.909(rt)-2.909 G .409(he redirection operator is)-2.909 F F1(>)2.909 E
F0 .409(and the)2.909 F F1(noclob)2.909 E(ber)-.1 E F0 .409
(option to the)2.909 F F1(set)2.909 E F0 -.2(bu)2.909 G .409
(iltin command).2 F(is not enabled, the redirection is attempted e)108
280.8 Q -.15(ve)-.25 G 2.5(ni).15 G 2.5(ft)-2.5 G(he \214le named by)
-2.5 E F2(wor)2.5 E(d)-.37 E F0 -.15(ex)2.5 G(ists.).15 E F1 -.25(Ap)87
297.6 S(pending Redir).25 E(ected Output)-.18 E F0 .642
(Redirection of output in this f)108 309.6 R .642
(ashion causes the \214le whose name results from the e)-.1 F .641
(xpansion of)-.15 F F2(wor)3.481 E(d)-.37 E F0 .641(to be)3.911 F .454
(opened for appending on \214le descriptor)108 321.6 R F2(n)3.315 E F0
2.955(,o).24 G 2.955(rt)-2.955 G .455
(he standard output \(\214le descriptor 1\) if)-2.955 F F2(n)3.315 E F0
.455(is not speci\214ed.)3.195 F(If)5.455 E(the \214le does not e)108
333.6 Q(xist it is created.)-.15 E
(The general format for appending output is:)108 350.4 Q([)144 367.2 Q
F2(n)A F0(])A F1(>>)A F2(wor)A(d)-.37 E F1(Redir)87 384 Q
(ecting Standard Output and Standard Err)-.18 E(or)-.18 E F0 .249
(This construct allo)108 396 R .249(ws both the standard output \(\214l\
e descriptor 1\) and the standard error output \(\214le descrip-)-.25 F
(tor 2\) to be redirected to the \214le whose name is the e)108 408 Q
(xpansion of)-.15 E F2(wor)2.84 E(d)-.37 E F0(.).77 E(There are tw)108
424.8 Q 2.5(of)-.1 G
(ormats for redirecting standard output and standard error:)-2.5 E F1
(&>)144 441.6 Q F2(wor)A(d)-.37 E F0(and)108 453.6 Q F1(>&)144 465.6 Q
F2(wor)A(d)-.37 E F0(Of the tw)108 482.4 Q 2.5(of)-.1 G
(orms, the \214rst is preferred.)-2.5 E(This is semantically equi)5 E
-.25(va)-.25 G(lent to).25 E F1(>)144 499.2 Q F2(wor)A(d)-.37 E F0(2)2.5
E F1(>&)A F0(1)A .114(When using the second form,)108 516 R F2(wor)2.614
E(d)-.37 E F0 .114(may not e)2.614 F .114(xpand to a number or)-.15 F F1
<ad>2.614 E F0 5.114(.I)C 2.614(fi)-5.114 G 2.615(td)-2.614 G .115
(oes, other redirection operators)-2.615 F(apply \(see)108 528 Q F1
(Duplicating File Descriptors)2.5 E F0(belo)2.5 E
(w\) for compatibility reasons.)-.25 E F1 -.25(Ap)87 544.8 S
(pending Standard Output and Standard Err).25 E(or)-.18 E F0 .249
(This construct allo)108 556.8 R .249(ws both the standard output \(\
\214le descriptor 1\) and the standard error output \(\214le descrip-)
-.25 F(tor 2\) to be appended to the \214le whose name is the e)108
568.8 Q(xpansion of)-.15 E F2(wor)2.84 E(d)-.37 E F0(.).77 E
(The format for appending standard output and standard error is:)108
585.6 Q F1(&>>)144 602.4 Q F2(wor)A(d)-.37 E F0
(This is semantically equi)108 619.2 Q -.25(va)-.25 G(lent to).25 E F1
(>>)144 636 Q F2(wor)A(d)-.37 E F0(2)2.5 E F1(>&)A F0(1)A(\(see)108
652.8 Q F1(Duplicating File Descriptors)2.5 E F0(belo)2.5 E(w\).)-.25 E
F1(Her)87 669.6 Q 2.5(eD)-.18 G(ocuments)-2.5 E F0 .33(This type of red\
irection instructs the shell to read input from the current source unti\
l a line containing only)108 681.6 R F2(delimiter)108.35 693.6 Q F0 .615
(\(with no trailing blanks\) is seen.)3.845 F .615
(All of the lines read up to that point are then used as the stan-)5.615
F(dard input \(or \214le descriptor)108 705.6 Q F2(n)2.5 E F0(if)2.5 E
F2(n)2.5 E F0(is speci\214ed\) for a command.)2.5 E
(The format of here-documents is:)108 722.4 Q(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(29)190.395 E 0 Cg EP
%%Page: 30 30
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E([)144 84 Q/F1 10
/Times-Italic@0 SF(n)A F0(])A/F2 10/Times-Bold@0 SF(<<)A F0([)A F2<ad>A
F0(])A F1(wor)A(d)-.37 E(her)164 96 Q(e-document)-.37 E(delimiter)144
108 Q F0 .301(No parameter and v)108 124.8 R .302(ariable e)-.25 F .302
(xpansion, command substitution, arithmetic e)-.15 F .302
(xpansion, or pathname e)-.15 F(xpansion)-.15 E .381(is performed on)108
136.8 R F1(wor)3.221 E(d)-.37 E F0 5.381(.I).77 G 2.881(fa)-5.381 G .681
-.15(ny p)-2.881 H .381(art of).15 F F1(wor)3.221 E(d)-.37 E F0 .381
(is quoted, the)3.651 F F1(delimiter)3.231 E F0 .381
(is the result of quote remo)3.611 F -.25(va)-.15 G 2.881(lo).25 G(n)
-2.881 E F1(wor)3.221 E(d)-.37 E F0(,).77 E .773
(and the lines in the here-document are not e)108 148.8 R 3.274
(xpanded. If)-.15 F F1(wor)3.274 E(d)-.37 E F0 .774
(is unquoted, all lines of the here-document)3.274 F 1.195
(are subjected to parameter e)108 160.8 R 1.194
(xpansion, command substitution, and arithmetic e)-.15 F 1.194
(xpansion, the character se-)-.15 F(quence)108 172.8 Q F2(\\<newline>)
2.5 E F0(is ignored, and)2.5 E F2(\\)2.5 E F0
(must be used to quote the characters)2.5 E F2(\\)2.5 E F0(,)A F2($)2.5
E F0 2.5(,a)C(nd)-2.5 E F2<92>2.5 E F0(.)A .601
(If the redirection operator is)108 189.6 R F2(<<\255)3.101 E F0 3.101
(,t)C .601(hen all leading tab characters are stripped from input lines\
 and the line)-3.101 F(containing)108 201.6 Q F1(delimiter)2.85 E F0 5
(.T).73 G(his allo)-5 E
(ws here-documents within shell scripts to be indented in a natural f)
-.25 E(ashion.)-.1 E F2(Her)87 218.4 Q 2.5(eS)-.18 G(trings)-2.5 E F0
2.5(Av)108 230.4 S(ariant of here documents, the format is:)-2.75 E([)
144 247.2 Q F1(n)A F0(])A F2(<<<)A F1(wor)A(d)-.37 E F0(The)108 264 Q F1
(wor)3.292 E(d)-.37 E F0(under)3.292 E .792(goes tilde e)-.18 F .792
(xpansion, parameter and v)-.15 F .792(ariable e)-.25 F .791
(xpansion, command substitution, arithmetic)-.15 F -.15(ex)108 276 S
1.187(pansion, and quote remo).15 F -.25(va)-.15 G 3.687(l. P).25 F
1.187(athname e)-.15 F 1.187(xpansion and w)-.15 F 1.187
(ord splitting are not performed.)-.1 F 1.188(The result is)6.187 F .375
(supplied as a single string, with a ne)108 288 R .374(wline appended, \
to the command on its standard input \(or \214le descrip-)-.25 F(tor)108
300 Q F1(n)2.5 E F0(if)2.5 E F1(n)2.5 E F0(is speci\214ed\).)2.5 E F2
(Duplicating File Descriptors)87 316.8 Q F0(The redirection operator)108
328.8 Q([)144 345.6 Q F1(n)A F0(])A F2(<&)A F1(wor)A(d)-.37 E F0 .126
(is used to duplicate input \214le descriptors.)108 362.4 R(If)5.127 E
F1(wor)2.967 E(d)-.37 E F0 -.15(ex)3.397 G .127
(pands to one or more digits, the \214le descriptor denoted).15 F(by)108
374.4 Q F1(n)3.318 E F0 .458(is made to be a cop)3.198 F 2.958(yo)-.1 G
2.958(ft)-2.958 G .457(hat \214le descriptor)-2.958 F 5.457(.I)-.55 G
2.957(ft)-5.457 G .457(he digits in)-2.957 F F1(wor)3.297 E(d)-.37 E F0
.457(do not specify a \214le descriptor open)3.727 F .149
(for input, a redirection error occurs.)108 386.4 R(If)5.149 E F1(wor)
2.989 E(d)-.37 E F0 -.25(eva)3.419 G .149(luates to).25 F F2<ad>2.649 E
F0 2.65<2c8c>C .15(le descriptor)-2.65 F F1(n)3.01 E F0 .15(is closed.)
2.89 F(If)5.15 E F1(n)3.01 E F0 .15(is not speci\214ed,)2.89 F
(the standard input \(\214le descriptor 0\) is used.)108 398.4 Q
(The operator)108 415.2 Q([)144 432 Q F1(n)A F0(])A F2(>&)A F1(wor)A(d)
-.37 E F0 .444
(is used similarly to duplicate output \214le descriptors.)108 448.8 R
(If)5.444 E F1(n)3.304 E F0 .443
(is not speci\214ed, the standard output \(\214le descrip-)3.183 F .565
(tor 1\) is used.)108 460.8 R .565(If the digits in)5.565 F F1(wor)3.406
E(d)-.37 E F0 .566(do not specify a \214le descriptor open for output, \
a redirection error oc-)3.836 F 3.204(curs. If)108 472.8 R F1(wor)3.544
E(d)-.37 E F0 -.25(eva)3.974 G .704(luates to).25 F F2<ad>3.204 E F0
3.204<2c8c>C .704(le descriptor)-3.204 F F1(n)3.563 E F0 .703
(is closed.)3.443 F .703(As a special case, if)5.703 F F1(n)3.203 E F0
.703(is omitted, and)3.203 F F1(wor)3.203 E(d)-.37 E F0(does)3.203 E
.965(not e)108 484.8 R .965(xpand to one or more digits or)-.15 F F2<ad>
3.465 E F0 3.466(,t)C .966
(he standard output and standard error are redirected as described)
-3.466 F(pre)108 496.8 Q(viously)-.25 E(.)-.65 E F2(Mo)87 513.6 Q
(ving File Descriptors)-.1 E F0(The redirection operator)108 525.6 Q([)
144 542.4 Q F1(n)A F0(])A F2(<&)A F1(digit)A F2<ad>A F0(mo)108 559.2 Q
-.15(ve)-.15 G 3.018(st).15 G .518(he \214le descriptor)-3.018 F F1
(digit)3.018 E F0 .518(to \214le descriptor)3.018 F F1(n)3.378 E F0
3.018(,o).24 G 3.018(rt)-3.018 G .517
(he standard input \(\214le descriptor 0\) if)-3.018 F F1(n)3.017 E F0
.517(is not speci-)3.017 F(\214ed.)108 571.2 Q F1(digit)5 E F0
(is closed after being duplicated to)2.5 E F1(n)2.5 E F0(.)A(Similarly)
108 588 Q 2.5(,t)-.65 G(he redirection operator)-2.5 E([)144 604.8 Q F1
(n)A F0(])A F2(>&)A F1(digit)A F2<ad>A F0(mo)108 621.6 Q -.15(ve)-.15 G
2.767(st).15 G .267(he \214le descriptor)-2.767 F F1(digit)2.767 E F0
.267(to \214le descriptor)2.767 F F1(n)3.127 E F0 2.767(,o).24 G 2.767
(rt)-2.767 G .268(he standard output \(\214le descriptor 1\) if)-2.767 F
F1(n)2.768 E F0 .268(is not speci-)2.768 F(\214ed.)108 633.6 Q F2
(Opening File Descriptors f)87 650.4 Q(or Reading and Writing)-.25 E F0
(The redirection operator)108 662.4 Q([)144 679.2 Q F1(n)A F0(])A F2(<>)
A F1(wor)A(d)-.37 E F0 .518(causes the \214le whose name is the e)108
696 R .518(xpansion of)-.15 F F1(wor)3.358 E(d)-.37 E F0 .518
(to be opened for both reading and writing on \214le de-)3.788 F
(scriptor)108 708 Q F1(n)2.86 E F0 2.5(,o).24 G 2.5(ro)-2.5 G 2.5<6e8c>
-2.5 G(le descriptor 0 if)-2.5 E F1(n)2.86 E F0(is not speci\214ed.)2.74
E(If the \214le does not e)5 E(xist, it is created.)-.15 E(GNU Bash 5.1)
72 768 Q(2020 October 29)141.235 E(30)190.395 E 0 Cg EP
%%Page: 31 31
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10.95
/Times-Bold@0 SF(ALIASES)72 84 Q/F2 10/Times-Italic@0 SF(Aliases)108 96
Q F0(allo)3.173 E 3.173(was)-.25 G .674(tring to be substituted for a w)
-3.173 F .674(ord when it is used as the \214rst w)-.1 F .674
(ord of a simple command.)-.1 F .394(The shell maintains a list of alia\
ses that may be set and unset with the)108 108 R/F3 10/Times-Bold@0 SF
(alias)2.893 E F0(and)2.893 E F3(unalias)2.893 E F0 -.2(bu)2.893 G .393
(iltin commands).2 F(\(see)108 120 Q/F4 9/Times-Bold@0 SF 1.979(SHELL B)
4.479 F(UIL)-.09 E 1.979(TIN COMMANDS)-.828 F F0(belo)4.229 E 4.48
(w\). The)-.25 F 1.98(\214rst w)4.48 F 1.98
(ord of each simple command, if unquoted, is)-.1 F(check)108 132 Q .473
(ed to see if it has an alias.)-.1 F .473(If so, that w)5.473 F .472
(ord is replaced by the te)-.1 F .472(xt of the alias.)-.15 F .472
(The characters)5.472 F F3(/)2.972 E F0(,)A F3($)2.972 E F0(,)A F3<92>
2.972 E F0(,)A(and)108 144 Q F3(=)3.611 E F0 1.111(and an)3.611 F 3.611
(yo)-.15 G 3.611(ft)-3.611 G 1.111(he shell)-3.611 F F2(metac)3.612 E
(har)-.15 E(acter)-.15 E(s)-.1 E F0 1.112
(or quoting characters listed abo)3.612 F 1.412 -.15(ve m)-.15 H 1.112
(ay not appear in an alias).15 F 3.62(name. The)108 156 R 1.12
(replacement te)3.62 F 1.119(xt may contain an)-.15 F 3.619(yv)-.15 G
1.119(alid shell input, including shell metacharacters.)-3.869 F 1.119
(The \214rst)6.119 F -.1(wo)108 168 S .513(rd of the replacement te).1 F
.513(xt is tested for aliases, b)-.15 F .513(ut a w)-.2 F .514
(ord that is identical to an alias being e)-.1 F .514(xpanded is)-.15 F
.296(not e)108 180 R .296(xpanded a second time.)-.15 F .296
(This means that one may alias)5.296 F F3(ls)2.796 E F0(to)2.796 E F3
.296(ls \255F)2.796 F F0 2.796(,f)C .295(or instance, and)-2.796 F F3
(bash)2.795 E F0 .295(does not try)2.795 F .528(to recursi)108 192 R
-.15(ve)-.25 G .528(ly e).15 F .528(xpand the replacement te)-.15 F
3.028(xt. If)-.15 F .528(the last character of the alias v)3.028 F .529
(alue is a)-.25 F F2(blank)3.299 E F0 3.029(,t).67 G .529(hen the ne)
-3.029 F(xt)-.15 E(command w)108 204 Q(ord follo)-.1 E
(wing the alias is also check)-.25 E(ed for alias e)-.1 E(xpansion.)-.15
E(Aliases are created and listed with the)108 220.8 Q F3(alias)2.5 E F0
(command, and remo)2.5 E -.15(ve)-.15 G 2.5(dw).15 G(ith the)-2.5 E F3
(unalias)2.5 E F0(command.)2.5 E .284
(There is no mechanism for using ar)108 237.6 R .284
(guments in the replacement te)-.18 F 2.784(xt. If)-.15 F(ar)2.784 E
.284(guments are needed, a shell func-)-.18 F(tion should be used \(see)
108 249.6 Q F4(FUNCTIONS)2.5 E F0(belo)2.25 E(w\).)-.25 E .282
(Aliases are not e)108 266.4 R .282
(xpanded when the shell is not interacti)-.15 F -.15(ve)-.25 G 2.782(,u)
.15 G .282(nless the)-2.782 F F3(expand_aliases)2.783 E F0 .283
(shell option is set us-)2.783 F(ing)108 278.4 Q F3(shopt)2.5 E F0
(\(see the description of)2.5 E F3(shopt)2.5 E F0(under)2.5 E F4
(SHELL B)2.5 E(UIL)-.09 E(TIN COMMANDS)-.828 E F0(belo)2.25 E(w\).)-.25
E .436
(The rules concerning the de\214nition and use of aliases are some)108
295.2 R .435(what confusing.)-.25 F F3(Bash)5.435 E F0(al)2.935 E -.1
(wa)-.1 G .435(ys reads at least).1 F .67
(one complete line of input, and all lines that mak)108 307.2 R 3.17(eu)
-.1 G 3.17(pac)-3.17 G .67(ompound command, before e)-3.17 F -.15(xe)
-.15 G .67(cuting an).15 F 3.17(yo)-.15 G 3.17(ft)-3.17 G(he)-3.17 E
1.059(commands on that line or the compound command.)108 319.2 R 1.059
(Aliases are e)6.059 F 1.058(xpanded when a command is read, not)-.15 F
.074(when it is e)108 331.2 R -.15(xe)-.15 G 2.574(cuted. Therefore,).15
F .075(an alias de\214nition appearing on the same line as another comm\
and does not)2.574 F(tak)108 343.2 Q 2.838(ee)-.1 G -.25(ff)-2.838 G
.338(ect until the ne).25 F .338(xt line of input is read.)-.15 F .337
(The commands follo)5.337 F .337
(wing the alias de\214nition on that line are)-.25 F .551(not af)108
355.2 R .551(fected by the ne)-.25 F 3.051(wa)-.25 G 3.051(lias. This)
-3.051 F(beha)3.051 E .551(vior is also an issue when functions are e)
-.2 F -.15(xe)-.15 G 3.051(cuted. Aliases).15 F .552(are e)3.052 F(x-)
-.15 E .426(panded when a function de\214nition is read, not when the f\
unction is e)108 367.2 R -.15(xe)-.15 G .425
(cuted, because a function de\214nition).15 F .403(is itself a command.)
108 379.2 R .403
(As a consequence, aliases de\214ned in a function are not a)5.403 F
-.25(va)-.2 G .404(ilable until after that func-).25 F .862(tion is e)
108 391.2 R -.15(xe)-.15 G 3.362(cuted. T).15 F 3.362(ob)-.8 G 3.362(es)
-3.362 G .862(afe, al)-3.362 F -.1(wa)-.1 G .862
(ys put alias de\214nitions on a separate line, and do not use).1 F F3
(alias)3.362 E F0 .862(in com-)3.362 F(pound commands.)108 403.2 Q -.15
(Fo)108 420 S 2.5(ra).15 G(lmost e)-2.5 E -.15(ve)-.25 G
(ry purpose, aliases are superseded by shell functions.).15 E F1
(FUNCTIONS)72 436.8 Q F0 3.467(As)108 448.8 S .967
(hell function, de\214ned as described abo)-3.467 F 1.267 -.15(ve u)-.15
H(nder).15 E F4 .967(SHELL GRAMMAR)3.467 F/F5 9/Times-Roman@0 SF(,)A F0
.968(stores a series of commands for)3.217 F 1.002(later e)108 460.8 R
-.15(xe)-.15 G 3.502(cution. When).15 F 1.002(the name of a shell funct\
ion is used as a simple command name, the list of com-)3.502 F .315
(mands associated with that function name is e)108 472.8 R -.15(xe)-.15
G 2.816(cuted. Functions).15 F .316(are e)2.816 F -.15(xe)-.15 G .316
(cuted in the conte).15 F .316(xt of the current)-.15 F .036
(shell; no ne)108 484.8 R 2.536(wp)-.25 G .036
(rocess is created to interpret them \(contrast this with the e)-2.536 F
-.15(xe)-.15 G .036(cution of a shell script\).).15 F .035(When a)5.035
F .639(function is e)108 496.8 R -.15(xe)-.15 G .639(cuted, the ar).15 F
.639
(guments to the function become the positional parameters during its e)
-.18 F -.15(xe)-.15 G(cution.).15 E .533(The special parameter)108 508.8
R F3(#)3.033 E F0 .532(is updated to re\215ect the change.)3.033 F .532
(Special parameter)5.532 F F3(0)3.032 E F0 .532(is unchanged.)3.032 F
.532(The \214rst ele-)5.532 F(ment of the)108 520.8 Q F4(FUNCN)2.5 E
(AME)-.18 E F0 -.25(va)2.25 G
(riable is set to the name of the function while the function is e).25 E
-.15(xe)-.15 G(cuting.).15 E 1.25(All other aspects of the shell e)108
537.6 R -.15(xe)-.15 G 1.25(cution en).15 F 1.25
(vironment are identical between a function and its caller with)-.4 F
1.215(these e)108 549.6 R 1.215(xceptions: the)-.15 F F4(DEB)3.715 E(UG)
-.09 E F0(and)3.465 E F3(RETURN)3.715 E F0 1.215
(traps \(see the description of the)3.715 F F3(trap)3.714 E F0 -.2(bu)
3.714 G 1.214(iltin under).2 F F4(SHELL)3.714 E -.09(BU)108 561.6 S(IL)
.09 E .478(TIN COMMANDS)-.828 F F0(belo)2.728 E .479
(w\) are not inherited unless the function has been gi)-.25 F -.15(ve)
-.25 G 2.979(nt).15 G(he)-2.979 E F3(trace)2.979 E F0(attrib)2.979 E
.479(ute \(see)-.2 F .421(the description of the)108 573.6 R F4(declar)
2.92 E(e)-.162 E F0 -.2(bu)2.67 G .42(iltin belo).2 F .42(w\) or the)
-.25 F F3 .42(\255o functrace)2.92 F F0 .42
(shell option has been enabled with the)2.92 F F3(set)2.92 E F0 -.2(bu)
108 585.6 S .071(iltin \(in which case all functions inherit the).2 F F3
(DEB)2.572 E(UG)-.1 E F0(and)2.572 E F3(RETURN)2.572 E F0 .072
(traps\), and the)2.572 F F4(ERR)2.572 E F0 .072(trap is not inher)2.322
F(-)-.2 E(ited unless the)108 597.6 Q F3(\255o errtrace)2.5 E F0
(shell option has been enabled.)2.5 E -1.11(Va)108 614.4 S .656
(riables local to the function may be declared with the)1.11 F F3(local)
3.155 E F0 -.2(bu)3.155 G .655(iltin command.).2 F(Ordinarily)5.655 E
3.155(,v)-.65 G .655(ariables and)-3.405 F .05(their v)108 626.4 R .05
(alues are shared between the function and its caller)-.25 F 5.051(.I)
-.55 G 2.551(fav)-5.051 G .051(ariable is declared)-2.801 F F3(local)
2.551 E F0 2.551(,t)C .051(he v)-2.551 F(ariable')-.25 E 2.551(sv)-.55 G
(isi-)-2.551 E 1.186(ble scope is restricted to that function and its c\
hildren \(including the functions it calls\).)108 638.4 R 1.185(Local v)
6.185 F(ariables)-.25 E("shado)108 650.4 Q .154(w" v)-.25 F .154
(ariables with the same name declared at pre)-.25 F .155(vious scopes.)
-.25 F -.15(Fo)5.155 G 2.655(ri).15 G .155(nstance, a local v)-2.655 F
.155(ariable declared)-.25 F .67(in a function hides a global v)108
662.4 R .669(ariable of the same name: references and assignments refer\
 to the local v)-.25 F(ari-)-.25 E .688(able, lea)108 674.4 R .688
(ving the global v)-.2 F .688(ariable unmodi\214ed.)-.25 F .688
(When the function returns, the global v)5.688 F .688
(ariable is once ag)-.25 F(ain)-.05 E(visible.)108 686.4 Q .727
(The shell uses)108 703.2 R F2 .727(dynamic scoping)3.227 F F0 .726
(to control a v)3.227 F(ariable')-.25 E 3.226(sv)-.55 G .726
(isibility within functions.)-3.226 F -.4(Wi)5.726 G .726
(th dynamic scoping,).4 F .007(visible v)108 715.2 R .007
(ariables and their v)-.25 F .007
(alues are a result of the sequence of function calls that caused e)-.25
F -.15(xe)-.15 G .008(cution to reach).15 F .814(the current function.)
108 727.2 R .813(The v)5.814 F .813(alue of a v)-.25 F .813
(ariable that a function sees depends on its v)-.25 F .813
(alue within its caller)-.25 F 3.313(,i)-.4 G(f)-3.313 E(GNU Bash 5.1)72
768 Q(2020 October 29)141.235 E(31)190.395 E 0 Cg EP
%%Page: 32 32
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(an)108 84 Q 2.116
-.65(y, w)-.15 H .816
(hether that caller is the "global" scope or another shell function.).65
F .817(This is also the v)5.816 F .817(alue that a local)-.25 F -.25(va)
108 96 S(riable declaration "shado).25 E(ws", and the v)-.25 E
(alue that is restored when the function returns.)-.25 E -.15(Fo)108
112.8 S 2.724(re).15 G .224(xample, if a v)-2.874 F(ariable)-.25 E/F1 10
/Times-Italic@0 SF(var)2.724 E F0 .223(is declared as local in function)
2.724 F F1(func1)2.723 E F0 2.723(,a)C(nd)-2.723 E F1(func1)2.723 E F0
.223(calls another function)2.723 F F1(func2)2.723 E F0(,)A .463
(references to)108 124.8 R F1(var)2.963 E F0 .463(made from within)2.963
F F1(func2)2.963 E F0 .463(will resolv)2.963 F 2.964(et)-.15 G 2.964(ot)
-2.964 G .464(he local v)-2.964 F(ariable)-.25 E F1(var)2.964 E F0(from)
2.964 E F1(func1)2.964 E F0 2.964(,s)C(hado)-2.964 E .464(wing an)-.25 F
(y)-.15 E(global v)108 136.8 Q(ariable named)-.25 E F1(var)2.5 E F0(.)A
(The)108 153.6 Q/F2 10/Times-Bold@0 SF(unset)2.983 E F0 -.2(bu)2.983 G
.483(iltin also acts using the same dynamic scope: if a v).2 F .482
(ariable is local to the current scope,)-.25 F F2(unset)2.982 E F0 .19
(will unset it; otherwise the unset will refer to the v)108 165.6 R .19
(ariable found in an)-.25 F 2.69(yc)-.15 G .19
(alling scope as described abo)-2.69 F -.15(ve)-.15 G 5.19(.I).15 G(f)
-5.19 E 2.721(av)108 177.6 S .221(ariable at the current local scope is\
 unset, it will remain so until it is reset in that scope or until the \
func-)-2.971 F .013(tion returns.)108 189.6 R .013
(Once the function returns, an)5.013 F 2.513(yi)-.15 G .014
(nstance of the v)-2.513 F .014(ariable at a pre)-.25 F .014
(vious scope will become visible.)-.25 F .567(If the unset acts on a v)
108 201.6 R .566(ariable at a pre)-.25 F .566(vious scope, an)-.25 F
3.066(yi)-.15 G .566(nstance of a v)-3.066 F .566
(ariable with that name that had been)-.25 F(shado)108 213.6 Q
(wed will become visible.)-.25 E(The)108 230.4 Q F2(FUNCNEST)3.528 E F0
-.25(va)3.528 G 1.028(riable, if set to a numeric v).25 F 1.028
(alue greater than 0, de\214nes a maximum function nesting)-.25 F(le)108
242.4 Q -.15(ve)-.25 G 2.5(l. Function).15 F(in)2.5 E -.2(vo)-.4 G
(cations that e).2 E(xceed the limit cause the entire command to abort.)
-.15 E .044(If the b)108 259.2 R .043(uiltin command)-.2 F F2 -.18(re)
2.543 G(tur).18 E(n)-.15 E F0 .043(is e)2.543 F -.15(xe)-.15 G .043
(cuted in a function, the function completes and e).15 F -.15(xe)-.15 G
.043(cution resumes with).15 F 1.011(the ne)108 271.2 R 1.011
(xt command after the function call.)-.15 F(An)6.011 E 3.511(yc)-.15 G
1.011(ommand associated with the)-3.511 F F2(RETURN)3.512 E F0 1.012
(trap is e)3.512 F -.15(xe)-.15 G(cuted).15 E .214(before e)108 283.2 R
-.15(xe)-.15 G .214(cution resumes.).15 F .213
(When a function completes, the v)5.214 F .213
(alues of the positional parameters and the spe-)-.25 F(cial parameter)
108 295.2 Q F2(#)2.5 E F0(are restored to the v)2.5 E(alues the)-.25 E
2.5(yh)-.15 G(ad prior to the function')-2.5 E 2.5(se)-.55 G -.15(xe)
-2.65 G(cution.).15 E 1.358
(Function names and de\214nitions may be listed with the)108 312 R F2
<ad66>3.858 E F0 1.358(option to the)3.858 F F2(declar)3.858 E(e)-.18 E
F0(or)3.859 E F2(typeset)3.859 E F0 -.2(bu)3.859 G 1.359(iltin com-).2 F
3.39(mands. The)108 324 R F2<ad46>3.39 E F0 .89(option to)3.39 F F2
(declar)3.39 E(e)-.18 E F0(or)3.39 E F2(typeset)3.39 E F0 .89
(will list the function names only \(and optionally the source)3.39 F
.326(\214le and line number)108 336 R 2.826(,i)-.4 G 2.826(ft)-2.826 G
(he)-2.826 E F2(extdeb)2.826 E(ug)-.2 E F0 .326
(shell option is enabled\).)2.826 F .327(Functions may be e)5.327 F .327
(xported so that subshells)-.15 F 1.298(automatically ha)108 348 R 1.598
-.15(ve t)-.2 H 1.298(hem de\214ned with the).15 F F2<ad66>3.798 E F0
1.298(option to the)3.798 F F2(export)3.797 E F0 -.2(bu)3.797 G 3.797
(iltin. A).2 F 1.297(function de\214nition may be)3.797 F
(deleted using the)108 360 Q F2<ad66>2.5 E F0(option to the)2.5 E F2
(unset)2.5 E F0 -.2(bu)2.5 G(iltin.).2 E .371(Functions may be recursi)
108 376.8 R -.15(ve)-.25 G 5.371(.T).15 G(he)-5.371 E F2(FUNCNEST)2.871
E F0 -.25(va)2.871 G .371
(riable may be used to limit the depth of the function call).25 F .323
(stack and restrict the number of function in)108 388.8 R -.2(vo)-.4 G
2.822(cations. By).2 F(def)2.822 E .322
(ault, no limit is imposed on the number of re-)-.1 F(cursi)108 400.8 Q
.3 -.15(ve c)-.25 H(alls.).15 E/F3 10.95/Times-Bold@0 SF(ARITHMETIC EV)
72 417.6 Q(ALU)-1.478 E -1.04(AT)-.657 G(ION)1.04 E F0 1.088
(The shell allo)108 429.6 R 1.088(ws arithmetic e)-.25 F 1.089
(xpressions to be e)-.15 F -.25(va)-.25 G 1.089
(luated, under certain circumstances \(see the).25 F F2(let)3.589 E F0
(and)3.589 E F2(de-)3.589 E(clar)108 441.6 Q(e)-.18 E F0 -.2(bu)3.453 G
.953(iltin commands, the).2 F F2(\(\()3.453 E F0 .952
(compound command, and)3.452 F F2 .952(Arithmetic Expansion)3.452 F F0
3.452(\). Ev)B .952(aluation is done in)-.25 F<8c78>108 453.6 Q 1.057
(ed-width inte)-.15 F 1.057(gers with no check for o)-.15 F -.15(ve)-.15
G(r\215o).15 E 2.357 -.65(w, t)-.25 H 1.057(hough di).65 F 1.057
(vision by 0 is trapped and \215agged as an error)-.25 F(.)-.55 E .829
(The operators and their precedence, associati)108 465.6 R(vity)-.25 E
3.329(,a)-.65 G .829(nd v)-3.329 F .829
(alues are the same as in the C language.)-.25 F .828(The fol-)5.828 F
(lo)108 477.6 Q .439(wing list of operators is grouped into le)-.25 F
-.15(ve)-.25 G .439(ls of equal-precedence operators.).15 F .44(The le)
5.44 F -.15(ve)-.25 G .44(ls are listed in order).15 F
(of decreasing precedence.)108 489.6 Q F1(id)108 506.4 Q F2(++)A F1(id)
2.5 E F2<adad>A F0 -.25(va)144 518.4 S
(riable post-increment and post-decrement).25 E F2 2.5<ad2b>108 530.4 S
F0(unary minus and plus)144 530.4 Q F2(++)108 542.4 Q F1(id)A F2<adad>
2.5 E F1(id)A F0 -.25(va)144 554.4 S
(riable pre-increment and pre-decrement).25 E F2 2.5(!~)108 566.4 S F0
(logical and bitwise ne)144 566.4 Q -.05(ga)-.15 G(tion).05 E F2(**)108
578.4 Q F0 -.15(ex)144 578.4 S(ponentiation).15 E F2 2.5(*/%)108 590.4 S
F0(multiplication, di)144 590.4 Q(vision, remainder)-.25 E F2 2.5<2bad>
108 602.4 S F0(addition, subtraction)144 602.4 Q F2(<< >>)108 614.4 Q F0
(left and right bitwise shifts)144 614.4 Q F2(<= >= < >)108 626.4 Q F0
(comparison)144 638.4 Q F2(== !=)108 650.4 Q F0(equality and inequality)
144 650.4 Q F2(&)108 662.4 Q F0(bitwise AND)144 662.4 Q F2(^)108 674.4 Q
F0(bitwise e)144 674.4 Q(xclusi)-.15 E .3 -.15(ve O)-.25 H(R).15 E F2(|)
108 686.4 Q F0(bitwise OR)144 686.4 Q F2(&&)108 698.4 Q F0(logical AND)
144 698.4 Q F2(||)108 710.4 Q F0(logical OR)144 710.4 Q(GNU Bash 5.1)72
768 Q(2020 October 29)141.235 E(32)190.395 E 0 Cg EP
%%Page: 33 33
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10
/Times-Italic@0 SF -.2(ex)108 84 S(pr).2 E/F2 10/Times-Bold@0 SF(?)A F1
-.2(ex)C(pr).2 E F2(:)A F1 -.2(ex)C(pr).2 E F0(conditional operator)144
96 Q F2 2.5(=*)108 108 S 2.5(=/)-2.5 G 2.5(=%)-2.5 G 2.5(=+)-2.5 G 2.5
<3dad>-2.5 G 2.5(=<)-2.5 G(<= >>= &= ^= |=)-2.5 E F0(assignment)144 120
Q F1 -.2(ex)108 132 S(pr1).2 E F2(,)2.5 E F1 -.2(ex)2.5 G(pr2).2 E F0
(comma)144 144 Q .68(Shell v)108 160.8 R .68(ariables are allo)-.25 F
.68(wed as operands; parameter e)-.25 F .68
(xpansion is performed before the e)-.15 F .68(xpression is e)-.15 F
-.25(va)-.25 G(lu-).25 E 3.507(ated. W)108 172.8 R 1.007(ithin an e)-.4
F 1.007(xpression, shell v)-.15 F 1.007
(ariables may also be referenced by name without using the parameter)
-.25 F -.15(ex)108 184.8 S .165(pansion syntax.).15 F 2.665(As)5.165 G
.165(hell v)-2.665 F .165(ariable that is null or unset e)-.25 F -.25
(va)-.25 G .165(luates to 0 when referenced by name without us-).25 F
.42(ing the parameter e)108 196.8 R .42(xpansion syntax.)-.15 F .42
(The v)5.42 F .421(alue of a v)-.25 F .421(ariable is e)-.25 F -.25(va)
-.25 G .421(luated as an arithmetic e).25 F .421(xpression when)-.15 F
.154(it is referenced, or when a v)108 208.8 R .154
(ariable which has been gi)-.25 F -.15(ve)-.25 G 2.654(nt).15 G(he)
-2.654 E F1(inte)2.654 E -.1(ge)-.4 G(r).1 E F0(attrib)2.654 E .153
(ute using)-.2 F F2(declar)2.653 E 2.653<65ad>-.18 G(i)-2.653 E F0 .153
(is assigned a)2.653 F -.25(va)108 220.8 S 2.857(lue. A).25 F .357
(null v)2.857 F .357(alue e)-.25 F -.25(va)-.25 G .357(luates to 0.).25
F 2.857(As)5.357 G .357(hell v)-2.857 F .357(ariable need not ha)-.25 F
.657 -.15(ve i)-.2 H(ts).15 E F1(inte)2.857 E -.1(ge)-.4 G(r).1 E F0
(attrib)2.857 E .357(ute turned on to be used)-.2 F(in an e)108 232.8 Q
(xpression.)-.15 E(Inte)108 249.6 Q .518(ger constants follo)-.15 F
3.018(wt)-.25 G .518(he C language de\214nition, without suf)-3.018 F
<8c78>-.25 E .517(es or character constants.)-.15 F .517(Constants with)
5.517 F 3.282(al)108 261.6 S .782
(eading 0 are interpreted as octal numbers.)-3.282 F 3.283(Al)5.782 G
.783(eading 0x or 0X denotes he)-3.283 F 3.283(xadecimal. Otherwise,)
-.15 F(num-)3.283 E .816(bers tak)108 273.6 R 3.316(et)-.1 G .816
(he form [)-3.316 F F1(base#)A F0 .815(]n, where the optional)B F1(base)
3.315 E F0 .815(is a decimal number between 2 and 64 representing)3.315
F .349(the arithmetic base, and)108 285.6 R F1(n)2.849 E F0 .349
(is a number in that base.)2.849 F(If)5.35 E F1(base#)2.85 E F0 .35
(is omitted, then base 10 is used.)2.85 F .35(When speci-)5.35 F(fying)
108 297.6 Q F1(n)2.975 E F0 2.975(,i)C 2.975(fan)-2.975 G .474(on-digit\
 is required, the digits greater than 9 are represented by the lo)-2.975
F .474(wercase letters, the up-)-.25 F .518
(percase letters, @, and _, in that order)108 309.6 R 5.518(.I)-.55 G(f)
-5.518 E F1(base)3.018 E F0 .518(is less than or equal to 36, lo)3.018 F
.518(wercase and uppercase letters)-.25 F
(may be used interchangeably to represent numbers between 10 and 35.)108
321.6 Q .235(Operators are e)108 338.4 R -.25(va)-.25 G .235
(luated in order of precedence.).25 F(Sub-e)5.234 E .234
(xpressions in parentheses are e)-.15 F -.25(va)-.25 G .234
(luated \214rst and may).25 F -.15(ove)108 350.4 S
(rride the precedence rules abo).15 E -.15(ve)-.15 G(.).15 E/F3 10.95
/Times-Bold@0 SF(CONDITION)72 367.2 Q(AL EXPRESSIONS)-.219 E F0 .255
(Conditional e)108 379.2 R .255(xpressions are used by the)-.15 F F2([[)
2.755 E F0 .255(compound command and the)2.755 F F2(test)2.755 E F0(and)
2.755 E F2([)2.756 E F0 -.2(bu)2.756 G .256(iltin commands to test).2 F
.134(\214le attrib)108 391.2 R .134
(utes and perform string and arithmetic comparisons.)-.2 F(The)5.133 E
F2(test)2.633 E F0(and)2.633 E F2([)2.633 E F0 .133
(commands determine their be-)2.633 F(ha)108 403.2 Q .197
(vior based on the number of ar)-.2 F .198
(guments; see the descriptions of those commands for an)-.18 F 2.698(yo)
-.15 G .198(ther command-)-2.698 F(speci\214c actions.)108 415.2 Q .235
(Expressions are formed from the follo)108 432 R .234
(wing unary or binary primaries.)-.25 F F2(Bash)5.234 E F0 .234
(handles se)2.734 F -.15(ve)-.25 G .234(ral \214lenames spe-).15 F .424
(cially when the)108 444 R 2.924(ya)-.15 G .424(re used in e)-2.924 F
2.925(xpressions. If)-.15 F .425(the operating system on which)2.925 F
F2(bash)2.925 E F0 .425(is running pro)2.925 F .425(vides these)-.15 F
.345(special \214les, bash will use them; otherwise it will emulate the\
m internally with this beha)108 456 R .344(vior: If an)-.2 F(y)-.15 E F1
(\214le)2.844 E F0(ar)2.844 E(-)-.2 E .805
(gument to one of the primaries is of the form)108 468 R F1(/de)3.305 E
(v/fd/n)-.15 E F0 3.306(,t)C .806(hen \214le descriptor)-3.306 F F1(n)
3.306 E F0 .806(is check)3.306 F 3.306(ed. If)-.1 F(the)3.306 E F1
(\214le)3.306 E F0(ar)3.306 E(gu-)-.18 E .03
(ment to one of the primaries is one of)108 480 R F1(/de)2.53 E(v/stdin)
-.15 E F0(,)A F1(/de)2.529 E(v/stdout)-.15 E F0 2.529(,o)C(r)-2.529 E F1
(/de)2.529 E(v/stderr)-.15 E F0 2.529<2c8c>C .029
(le descriptor 0, 1, or 2, respec-)-2.529 F(ti)108 492 Q -.15(ve)-.25 G
(ly).15 E 2.5(,i)-.65 G 2.5(sc)-2.5 G(heck)-2.5 E(ed.)-.1 E .721
(Unless otherwise speci\214ed, primaries that operate on \214les follo)
108 508.8 R 3.221(ws)-.25 G .722(ymbolic links and operate on the tar)
-3.221 F(get)-.18 E(of the link, rather than the link itself.)108 520.8
Q 1.096(When used with)108 538.8 R F2([[)3.596 E F0 3.596(,t)C(he)-3.596
E F2(<)3.596 E F0(and)3.595 E F2(>)3.595 E F0 1.095(operators sort le)
3.595 F 1.095(xicographically using the current locale.)-.15 F(The)6.095
E F2(test)3.595 E F0(com-)3.595 E(mand sorts using ASCII ordering.)108
550.8 Q F2<ad61>108 574.8 Q F1(\214le)2.5 E F0 -.35(Tr)144 574.8 S
(ue if).35 E F1(\214le)2.5 E F0 -.15(ex)2.5 G(ists.).15 E F2<ad62>108
586.8 Q F1(\214le)2.5 E F0 -.35(Tr)144 586.8 S(ue if).35 E F1(\214le)2.5
E F0 -.15(ex)2.5 G(ists and is a block special \214le.).15 E F2<ad63>108
598.8 Q F1(\214le)2.5 E F0 -.35(Tr)144 598.8 S(ue if).35 E F1(\214le)2.5
E F0 -.15(ex)2.5 G(ists and is a character special \214le.).15 E F2
<ad64>108 610.8 Q F1(\214le)2.5 E F0 -.35(Tr)144 610.8 S(ue if).35 E F1
(\214le)2.5 E F0 -.15(ex)2.5 G(ists and is a directory).15 E(.)-.65 E F2
<ad65>108 622.8 Q F1(\214le)2.5 E F0 -.35(Tr)144 622.8 S(ue if).35 E F1
(\214le)2.5 E F0 -.15(ex)2.5 G(ists.).15 E F2<ad66>108 634.8 Q F1
(\214le)2.5 E F0 -.35(Tr)144 634.8 S(ue if).35 E F1(\214le)2.5 E F0 -.15
(ex)2.5 G(ists and is a re).15 E(gular \214le.)-.15 E F2<ad67>108 646.8
Q F1(\214le)2.5 E F0 -.35(Tr)144 646.8 S(ue if).35 E F1(\214le)2.5 E F0
-.15(ex)2.5 G(ists and is set-group-id.).15 E F2<ad68>108 658.8 Q F1
(\214le)2.5 E F0 -.35(Tr)144 658.8 S(ue if).35 E F1(\214le)2.5 E F0 -.15
(ex)2.5 G(ists and is a symbolic link.).15 E F2<ad6b>108 670.8 Q F1
(\214le)2.5 E F0 -.35(Tr)144 670.8 S(ue if).35 E F1(\214le)2.5 E F0 -.15
(ex)2.5 G(ists and its `).15 E(`stick)-.74 E(y')-.15 E 2.5('b)-.74 G
(it is set.)-2.5 E F2<ad70>108 682.8 Q F1(\214le)2.5 E F0 -.35(Tr)144
682.8 S(ue if).35 E F1(\214le)2.5 E F0 -.15(ex)2.5 G
(ists and is a named pipe \(FIFO\).).15 E F2<ad72>108 694.8 Q F1(\214le)
2.5 E F0 -.35(Tr)144 694.8 S(ue if).35 E F1(\214le)2.5 E F0 -.15(ex)2.5
G(ists and is readable.).15 E F2<ad73>108 706.8 Q F1(\214le)2.5 E F0
-.35(Tr)144 706.8 S(ue if).35 E F1(\214le)2.5 E F0 -.15(ex)2.5 G
(ists and has a size greater than zero.).15 E F2<ad74>108 718.8 Q F1(fd)
2.5 E F0 -.35(Tr)144 718.8 S(ue if \214le descriptor).35 E F1(fd)4.47 E
F0(is open and refers to a terminal.)3.27 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(33)190.395 E 0 Cg EP
%%Page: 34 34
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF<ad75>108 84 Q/F2 10/Times-Italic@0 SF(\214le)2.5 E F0 -.35(Tr)144 84
S(ue if).35 E F2(\214le)2.5 E F0 -.15(ex)2.5 G(ists and its set-user).15
E(-id bit is set.)-.2 E F1<ad77>108 96 Q F2(\214le)2.5 E F0 -.35(Tr)144
96 S(ue if).35 E F2(\214le)2.5 E F0 -.15(ex)2.5 G(ists and is writable.)
.15 E F1<ad78>108 108 Q F2(\214le)2.5 E F0 -.35(Tr)144 108 S(ue if).35 E
F2(\214le)2.5 E F0 -.15(ex)2.5 G(ists and is e).15 E -.15(xe)-.15 G
(cutable.).15 E F1<ad47>108 120 Q F2(\214le)2.5 E F0 -.35(Tr)144 120 S
(ue if).35 E F2(\214le)2.5 E F0 -.15(ex)2.5 G(ists and is o).15 E
(wned by the ef)-.25 E(fecti)-.25 E .3 -.15(ve g)-.25 H(roup id.).15 E
F1<ad4c>108 132 Q F2(\214le)2.5 E F0 -.35(Tr)144 132 S(ue if).35 E F2
(\214le)2.5 E F0 -.15(ex)2.5 G(ists and is a symbolic link.).15 E F1
<ad4e>108 144 Q F2(\214le)2.5 E F0 -.35(Tr)144 144 S(ue if).35 E F2
(\214le)2.5 E F0 -.15(ex)2.5 G(ists and has been modi\214ed since it w)
.15 E(as last read.)-.1 E F1<ad4f>108 156 Q F2(\214le)2.5 E F0 -.35(Tr)
144 156 S(ue if).35 E F2(\214le)2.5 E F0 -.15(ex)2.5 G(ists and is o).15
E(wned by the ef)-.25 E(fecti)-.25 E .3 -.15(ve u)-.25 H(ser id.).15 E
F1<ad53>108 168 Q F2(\214le)2.5 E F0 -.35(Tr)144 168 S(ue if).35 E F2
(\214le)2.5 E F0 -.15(ex)2.5 G(ists and is a sock).15 E(et.)-.1 E F2
(\214le1)108 180 Q F1(\255ef)2.5 E F2(\214le2)2.5 E F0 -.35(Tr)144 192 S
(ue if).35 E F2(\214le1)2.5 E F0(and)2.5 E F2(\214le2)2.5 E F0
(refer to the same de)2.5 E(vice and inode numbers.)-.25 E F2(\214le1)
108 204 Q F0<ad>2.5 E F1(nt)A F2(\214le2)2.5 E F0 -.35(Tr)144 216 S
(ue if).35 E F2(\214le1)2.5 E F0(is ne)2.5 E
(wer \(according to modi\214cation date\) than)-.25 E F2(\214le2)2.5 E
F0 2.5(,o)C 2.5(ri)-2.5 G(f)-2.5 E F2(\214le1)2.5 E F0 -.15(ex)2.5 G
(ists and).15 E F2(\214le2)2.5 E F0(does not.)2.5 E F2(\214le1)108 228 Q
F0<ad>2.5 E F1(ot)A F2(\214le2)2.5 E F0 -.35(Tr)144 240 S(ue if).35 E F2
(\214le1)2.5 E F0(is older than)2.5 E F2(\214le2)2.5 E F0 2.5(,o)C 2.5
(ri)-2.5 G(f)-2.5 E F2(\214le2)2.5 E F0 -.15(ex)2.5 G(ists and).15 E F2
(\214le1)2.5 E F0(does not.)2.5 E F1<ad6f>108 252 Q F2(optname)2.5 E F0
-.35(Tr)144 264 S .262(ue if the shell option).35 F F2(optname)2.992 E
F0 .262(is enabled.)2.942 F .262
(See the list of options under the description of the)5.262 F F1<ad6f>
2.763 E F0(option to the)144 276 Q F1(set)2.5 E F0 -.2(bu)2.5 G
(iltin belo).2 E -.65(w.)-.25 G F1<ad76>108 288 Q F2(varname)2.5 E F0
-.35(Tr)144 300 S(ue if the shell v).35 E(ariable)-.25 E F2(varname)2.79
E F0(is set \(has been assigned a v)2.68 E(alue\).)-.25 E F1<ad52>108
312 Q F2(varname)2.5 E F0 -.35(Tr)144 324 S(ue if the shell v).35 E
(ariable)-.25 E F2(varname)2.79 E F0(is set and is a name reference.)
2.68 E F1<ad7a>108 336 Q F2(string)2.5 E F0 -.35(Tr)144 348 S
(ue if the length of).35 E F2(string)2.5 E F0(is zero.)2.5 E F2(string)
108 360 Q F1<ad6e>108 372 Q F2(string)2.5 E F0 -.35(Tr)144 384 S
(ue if the length of).35 E F2(string)2.84 E F0(is non-zero.)2.72 E F2
(string1)108 400.8 Q F1(==)2.5 E F2(string2)2.5 E(string1)108 412.8 Q F1
(=)2.5 E F2(string2)2.5 E F0 -.35(Tr)144 424.8 S .862
(ue if the strings are equal.).35 F F1(=)5.861 E F0 .861
(should be used with the)3.361 F F1(test)3.361 E F0 .861
(command for POSIX conformance.)3.361 F .446(When used with the)144
436.8 R F1([[)2.946 E F0 .446
(command, this performs pattern matching as described abo)2.946 F .747
-.15(ve \()-.15 H F1(Compound).15 E(Commands)144 448.8 Q F0(\).)A F2
(string1)108 465.6 Q F1(!=)2.5 E F2(string2)2.5 E F0 -.35(Tr)144 477.6 S
(ue if the strings are not equal.).35 E F2(string1)108 494.4 Q F1(<)2.5
E F2(string2)2.5 E F0 -.35(Tr)144 506.4 S(ue if).35 E F2(string1)2.5 E
F0(sorts before)2.5 E F2(string2)2.5 E F0(le)2.5 E(xicographically)-.15
E(.)-.65 E F2(string1)108 523.2 Q F1(>)2.5 E F2(string2)2.5 E F0 -.35
(Tr)144 535.2 S(ue if).35 E F2(string1)2.5 E F0(sorts after)2.5 E F2
(string2)2.5 E F0(le)2.5 E(xicographically)-.15 E(.)-.65 E F2(ar)108.33
552 Q(g1)-.37 E F1(OP)2.5 E F2(ar)2.5 E(g2)-.37 E/F3 9/Times-Bold@0 SF
(OP)144 564 Q F0 .385(is one of)2.635 F F1(\255eq)2.885 E F0(,)A F1
(\255ne)2.885 E F0(,)A F1(\255lt)2.885 E F0(,)A F1(\255le)2.885 E F0(,)A
F1(\255gt)2.885 E F0 2.885(,o)C(r)-2.885 E F1(\255ge)2.885 E F0 5.385
(.T)C .385(hese arithmetic binary operators return true if)-5.385 F F2
(ar)2.884 E(g1)-.37 E F0 .845(is equal to, not equal to, less than, les\
s than or equal to, greater than, or greater than or equal to)144 576 R
F2(ar)144 588 Q(g2)-.37 E F0 3.59(,r)C(especti)-3.59 E -.15(ve)-.25 G
(ly).15 E(.)-.65 E F2(Ar)7.1 E(g1)-.37 E F0(and)3.59 E F2(ar)3.92 E(g2)
-.37 E F0 1.089(may be positi)3.61 F 1.389 -.15(ve o)-.25 H 3.589(rn).15
G -2.25 -.15(eg a)-3.589 H(ti).15 E 1.389 -.15(ve i)-.25 H(nte).15 E
3.589(gers. When)-.15 F 1.089(used with the)3.589 F F1([[)3.589 E F0
(command,)144 600 Q F2(Ar)4.447 E(g1)-.37 E F0(and)3.437 E F2(Ar)4.447 E
(g2)-.37 E F0 .937(are e)3.457 F -.25(va)-.25 G .937
(luated as arithmetic e).25 F .937(xpressions \(see)-.15 F F3 .937
(ARITHMETIC EV)3.437 F(ALU)-1.215 E(A-)-.54 E(TION)144 612 Q F0(abo)2.25
E -.15(ve)-.15 G(\).).15 E/F4 10.95/Times-Bold@0 SF(SIMPLE COMMAND EXP)
72 628.8 Q(ANSION)-.81 E F0 .614(When a simple command is e)108 640.8 R
-.15(xe)-.15 G .614(cuted, the shell performs the follo).15 F .613
(wing e)-.25 F .613(xpansions, assignments, and redi-)-.15 F
(rections, from left to right, in the follo)108 652.8 Q(wing order)-.25
E(.)-.55 E(1.)108 669.6 Q 1.848(The w)144 669.6 R 1.848
(ords that the parser has mark)-.1 F 1.848(ed as v)-.1 F 1.849
(ariable assignments \(those preceding the command)-.25 F
(name\) and redirections are sa)144 681.6 Q -.15(ve)-.2 G 2.5(df).15 G
(or later processing.)-2.5 E(2.)108 698.4 Q .18(The w)144 698.4 R .18
(ords that are not v)-.1 F .179
(ariable assignments or redirections are e)-.25 F 2.679(xpanded. If)-.15
F(an)2.679 E 2.679(yw)-.15 G .179(ords remain af-)-2.779 F .346(ter e)
144 710.4 R .346(xpansion, the \214rst w)-.15 F .346(ord is tak)-.1 F
.347(en to be the name of the command and the remaining w)-.1 F .347
(ords are)-.1 F(the ar)144 722.4 Q(guments.)-.18 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(34)190.395 E 0 Cg EP
%%Page: 35 35
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(3.)108 84 Q
(Redirections are performed as described abo)144 84 Q .3 -.15(ve u)-.15
H(nder).15 E/F1 9/Times-Bold@0 SF(REDIRECTION)2.5 E/F2 9/Times-Roman@0
SF(.)A F0(4.)108 100.8 Q .717(The te)144 100.8 R .717(xt after the)-.15
F/F3 10/Times-Bold@0 SF(=)3.217 E F0 .717(in each v)3.217 F .717
(ariable assignment under)-.25 F .717(goes tilde e)-.18 F .717
(xpansion, parameter e)-.15 F(xpansion,)-.15 E .339
(command substitution, arithmetic e)144 112.8 R .339
(xpansion, and quote remo)-.15 F -.25(va)-.15 G 2.839(lb).25 G .339
(efore being assigned to the v)-2.839 F(ari-)-.25 E(able.)144 124.8 Q
.332(If no command name results, the v)108 141.6 R .332
(ariable assignments af)-.25 F .332(fect the current shell en)-.25 F
2.832(vironment. Otherwise,)-.4 F(the)2.832 E -.25(va)108 153.6 S .757
(riables are added to the en).25 F .757(vironment of the e)-.4 F -.15
(xe)-.15 G .757(cuted command and do not af).15 F .757
(fect the current shell en)-.25 F(vi-)-.4 E 3.177(ronment. If)108 165.6
R(an)3.177 E 3.177(yo)-.15 G 3.177(ft)-3.177 G .677
(he assignments attempts to assign a v)-3.177 F .677
(alue to a readonly v)-.25 F .676(ariable, an error occurs, and)-.25 F
(the command e)108 177.6 Q(xits with a non-zero status.)-.15 E .149
(If no command name results, redirections are performed, b)108 194.4 R
.149(ut do not af)-.2 F .15(fect the current shell en)-.25 F 2.65
(vironment. A)-.4 F(redirection error causes the command to e)108 206.4
Q(xit with a non-zero status.)-.15 E 1.064
(If there is a command name left after e)108 223.2 R 1.064(xpansion, e)
-.15 F -.15(xe)-.15 G 1.064(cution proceeds as described belo).15 F
4.864 -.65(w. O)-.25 H 1.064(therwise, the).65 F .068(command e)108
235.2 R 2.568(xits. If)-.15 F .069(one of the e)2.568 F .069
(xpansions contained a command substitution, the e)-.15 F .069
(xit status of the command)-.15 F .467(is the e)108 247.2 R .466
(xit status of the last command substitution performed.)-.15 F .466
(If there were no command substitutions, the)5.466 F(command e)108 259.2
Q(xits with a status of zero.)-.15 E/F4 10.95/Times-Bold@0 SF
(COMMAND EXECUTION)72 276 Q F0 .546
(After a command has been split into w)108 288 R .547
(ords, if it results in a simple command and an optional list of ar)-.1
F(gu-)-.18 E(ments, the follo)108 300 Q(wing actions are tak)-.25 E(en.)
-.1 E .379(If the command name contains no slashes, the shell attempts \
to locate it.)108 316.8 R .379(If there e)5.379 F .379
(xists a shell function by)-.15 F .246(that name, that function is in)
108 328.8 R -.2(vo)-.4 G -.1(ke).2 G 2.746(da).1 G 2.746(sd)-2.746 G
.246(escribed abo)-2.746 F .546 -.15(ve i)-.15 H(n).15 E F1(FUNCTIONS)
2.746 E F2(.)A F0 .246(If the name does not match a func-)4.746 F
(tion, the shell searches for it in the list of shell b)108 340.8 Q 2.5
(uiltins. If)-.2 F 2.5(am)2.5 G(atch is found, that b)-2.5 E
(uiltin is in)-.2 E -.2(vo)-.4 G -.1(ke).2 G(d.).1 E .31
(If the name is neither a shell function nor a b)108 357.6 R .309
(uiltin, and contains no slashes,)-.2 F F3(bash)2.809 E F0 .309
(searches each element of)2.809 F(the)108 369.6 Q F1 -.666(PA)3.162 G
(TH)-.189 E F0 .662(for a directory containing an e)2.912 F -.15(xe)-.15
G .662(cutable \214le by that name.).15 F F3(Bash)5.662 E F0 .663
(uses a hash table to remember)3.162 F 1.915(the full pathnames of e)108
381.6 R -.15(xe)-.15 G 1.915(cutable \214les \(see).15 F F3(hash)4.415 E
F0(under)4.415 E F1 1.915(SHELL B)4.415 F(UIL)-.09 E 1.914(TIN COMMANDS)
-.828 F F0(belo)4.164 E 4.414(w\). A)-.25 F(full)4.414 E .719
(search of the directories in)108 393.6 R F1 -.666(PA)3.219 G(TH)-.189 E
F0 .72(is performed only if the command is not found in the hash table.)
2.969 F .72(If the)5.72 F .956(search is unsuccessful, the shell search\
es for a de\214ned shell function named)108 405.6 R F3(command_not_f)
3.455 E(ound_han-)-.25 E(dle)108 417.6 Q F0 6.005(.I)C 3.505(ft)-6.005 G
1.005(hat function e)-3.505 F 1.005(xists, it is in)-.15 F -.2(vo)-.4 G
-.1(ke).2 G 3.506(di).1 G 3.506(nas)-3.506 G 1.006(eparate e)-3.506 F
-.15(xe)-.15 G 1.006(cution en).15 F 1.006
(vironment with the original command)-.4 F .256
(and the original command')108 429.6 R 2.756(sa)-.55 G -.18(rg)-2.756 G
.256(uments as its ar).18 F .256(guments, and the function')-.18 F 2.755
(se)-.55 G .255(xit status becomes the e)-2.905 F .255(xit sta-)-.15 F
.263(tus of that subshell.)108 441.6 R .263(If that function is not de\
\214ned, the shell prints an error message and returns an e)5.263 F .263
(xit sta-)-.15 F(tus of 127.)108 453.6 Q 1.089(If the search is success\
ful, or if the command name contains one or more slashes, the shell e)
108 470.4 R -.15(xe)-.15 G 1.089(cutes the).15 F .197
(named program in a separate e)108 482.4 R -.15(xe)-.15 G .197
(cution en).15 F 2.698(vironment. Ar)-.4 F .198
(gument 0 is set to the name gi)-.18 F -.15(ve)-.25 G .198
(n, and the remain-).15 F(ing ar)108 494.4 Q
(guments to the command are set to the ar)-.18 E(guments gi)-.18 E -.15
(ve)-.25 G(n, if an).15 E -.65(y.)-.15 G 1.049(If this e)108 511.2 R
-.15(xe)-.15 G 1.049(cution f).15 F 1.049
(ails because the \214le is not in e)-.1 F -.15(xe)-.15 G 1.048
(cutable format, and the \214le is not a directory).15 F 3.548(,i)-.65 G
3.548(ti)-3.548 G 3.548(sa)-3.548 G(s-)-3.548 E .042(sumed to be a)108
523.2 R/F5 10/Times-Italic@0 SF .042(shell script)2.542 F F0 2.542
(,a\214)C .043(le containing shell commands.)-2.542 F 2.543(As)5.043 G
.043(ubshell is spa)-2.543 F .043(wned to e)-.15 F -.15(xe)-.15 G .043
(cute it.).15 F .043(This sub-)5.043 F .275
(shell reinitializes itself, so that the ef)108 535.2 R .274
(fect is as if a ne)-.25 F 2.774(ws)-.25 G .274(hell had been in)-2.774
F -.2(vo)-.4 G -.1(ke).2 G 2.774(dt).1 G 2.774(oh)-2.774 G .274
(andle the script, with the)-2.774 F -.15(ex)108 547.2 S 2.357
(ception that the locations of commands remembered by the parent \(see)
.15 F F3(hash)4.858 E F0(belo)4.858 E 4.858(wu)-.25 G(nder)-4.858 E F1
(SHELL)4.858 E -.09(BU)108 559.2 S(IL).09 E(TIN COMMANDS)-.828 E F2(\))A
F0(are retained by the child.)2.25 E .348(If the program is a \214le be)
108 576 R .348(ginning with)-.15 F F3(#!)2.848 E F0 2.848(,t)C .347(he \
remainder of the \214rst line speci\214es an interpreter for the pro-)
-2.848 F 3.178(gram. The)108 588 R .678(shell e)3.178 F -.15(xe)-.15 G
.678(cutes the speci\214ed interpreter on operating systems that do not\
 handle this e).15 F -.15(xe)-.15 G(cutable).15 E .206(format themselv)
108 600 R 2.706(es. The)-.15 F(ar)2.706 E .206
(guments to the interpreter consist of a single optional ar)-.18 F .206
(gument follo)-.18 F .206(wing the in-)-.25 F .267
(terpreter name on the \214rst line of the program, follo)108 612 R .268
(wed by the name of the program, follo)-.25 F .268(wed by the com-)-.25
F(mand ar)108 624 Q(guments, if an)-.18 E -.65(y.)-.15 G F4
(COMMAND EXECUTION ENVIR)72 640.8 Q(ONMENT)-.329 E F0(The shell has an)
108 652.8 Q F5 -.2(ex)2.5 G(ecution en).2 E(vir)-.4 E(onment)-.45 E F0
2.5(,w)C(hich consists of the follo)-2.5 E(wing:)-.25 E<83>108 669.6 Q
1.406(open \214les inherited by the shell at in)144 669.6 R -.2(vo)-.4 G
1.405(cation, as modi\214ed by redirections supplied to the).2 F F3
(exec)3.905 E F0 -.2(bu)144 681.6 S(iltin).2 E<83>108 698.4 Q
(the current w)144 698.4 Q(orking directory as set by)-.1 E F3(cd)2.5 E
F0(,)A F3(pushd)2.5 E F0 2.5(,o)C(r)-2.5 E F3(popd)2.5 E F0 2.5(,o)C 2.5
(ri)-2.5 G(nherited by the shell at in)-2.5 E -.2(vo)-.4 G(cation).2 E
<83>108 715.2 Q(the \214le creation mode mask as set by)144 715.2 Q F3
(umask)2.5 E F0(or inherited from the shell')2.5 E 2.5(sp)-.55 G(arent)
-2.5 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(35)190.395 E 0 Cg
EP
%%Page: 36 36
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E<83>108 84 Q
(current traps set by)144 84 Q/F1 10/Times-Bold@0 SF(trap)2.5 E F0<83>
108 100.8 Q .256(shell parameters that are set by v)144 100.8 R .256
(ariable assignment or with)-.25 F F1(set)2.756 E F0 .257
(or inherited from the shell')2.756 F 2.757(sp)-.55 G(arent)-2.757 E
(in the en)144 112.8 Q(vironment)-.4 E<83>108 129.6 Q
(shell functions de\214ned during e)144 129.6 Q -.15(xe)-.15 G
(cution or inherited from the shell').15 E 2.5(sp)-.55 G
(arent in the en)-2.5 E(vironment)-.4 E<83>108 146.4 Q
(options enabled at in)144 146.4 Q -.2(vo)-.4 G(cation \(either by def)
.2 E(ault or with command-line ar)-.1 E(guments\) or by)-.18 E F1(set)
2.5 E F0<83>108 163.2 Q(options enabled by)144 163.2 Q F1(shopt)2.5 E F0
<83>108 180 Q(shell aliases de\214ned with)144 180 Q F1(alias)2.5 E F0
<83>108 196.8 Q -.25(va)144 196.8 S
(rious process IDs, including those of background jobs, the v).25 E
(alue of)-.25 E F1($$)2.5 E F0 2.5(,a)C(nd the v)-2.5 E(alue of)-.25 E
/F2 9/Times-Bold@0 SF(PPID)2.5 E F0 .427
(When a simple command other than a b)108 213.6 R .426
(uiltin or shell function is to be e)-.2 F -.15(xe)-.15 G .426
(cuted, it is in).15 F -.2(vo)-.4 G -.1(ke).2 G 2.926(di).1 G 2.926(nas)
-2.926 G(eparate)-2.926 E -.15(exe)108 225.6 S .133(cution en).15 F .133
(vironment that consists of the follo)-.4 F 2.634(wing. Unless)-.25 F
.134(otherwise noted, the v)2.634 F .134(alues are inherited from)-.25 F
(the shell.)108 237.6 Q<83>108 254.4 Q 1.056(the shell')144 254.4 R
3.556(so)-.55 G 1.056(pen \214les, plus an)-3.556 F 3.556(ym)-.15 G
1.056
(odi\214cations and additions speci\214ed by redirections to the com-)
-3.556 F(mand)144 266.4 Q<83>108 283.2 Q(the current w)144 283.2 Q
(orking directory)-.1 E<83>108 300 Q(the \214le creation mode mask)144
300 Q<83>108 316.8 Q .856(shell v)144 316.8 R .857
(ariables and functions mark)-.25 F .857(ed for e)-.1 F .857
(xport, along with v)-.15 F .857(ariables e)-.25 F .857
(xported for the command,)-.15 F(passed in the en)144 328.8 Q(vironment)
-.4 E<83>108 345.6 Q .307(traps caught by the shell are reset to the v)
144 345.6 R .306(alues inherited from the shell')-.25 F 2.806(sp)-.55 G
.306(arent, and traps ignored)-2.806 F(by the shell are ignored)144
357.6 Q 2.5(Ac)108 374.4 S(ommand in)-2.5 E -.2(vo)-.4 G -.1(ke).2 G 2.5
(di).1 G 2.5(nt)-2.5 G(his separate en)-2.5 E(vironment cannot af)-.4 E
(fect the shell')-.25 E 2.5(se)-.55 G -.15(xe)-2.65 G(cution en).15 E
(vironment.)-.4 E .577(Command substitution, commands grouped with pare\
ntheses, and asynchronous commands are in)108 391.2 R -.2(vo)-.4 G -.1
(ke).2 G 3.078(di).1 G(n)-3.078 E 2.745(as)108 403.2 S .245(ubshell en)
-2.745 F .245(vironment that is a duplicate of the shell en)-.4 F .244
(vironment, e)-.4 F .244(xcept that traps caught by the shell are)-.15 F
.358(reset to the v)108 415.2 R .358
(alues that the shell inherited from its parent at in)-.25 F -.2(vo)-.4
G 2.858(cation. Builtin).2 F .359(commands that are in)2.859 F -.2(vo)
-.4 G -.1(ke).2 G(d).1 E .857(as part of a pipeline are also e)108 427.2
R -.15(xe)-.15 G .856(cuted in a subshell en).15 F 3.356
(vironment. Changes)-.4 F .856(made to the subshell en)3.356 F(viron-)
-.4 E(ment cannot af)108 439.2 Q(fect the shell')-.25 E 2.5(se)-.55 G
-.15(xe)-2.65 G(cution en).15 E(vironment.)-.4 E 1.376(Subshells spa)108
456 R 1.376(wned to e)-.15 F -.15(xe)-.15 G 1.377
(cute command substitutions inherit the v).15 F 1.377(alue of the)-.25 F
F1<ad65>3.877 E F0 1.377(option from the parent)3.877 F 2.5(shell. When)
108 468 R(not in)2.5 E/F3 10/Times-Italic@0 SF(posix mode)2.5 E F0(,)A
F1(bash)2.5 E F0(clears the)2.5 E F1<ad65>2.5 E F0
(option in such subshells.)2.5 E .405(If a command is follo)108 484.8 R
.405(wed by a)-.25 F F1(&)2.905 E F0 .404(and job control is not acti)
2.905 F -.15(ve)-.25 G 2.904(,t).15 G .404(he def)-2.904 F .404
(ault standard input for the command)-.1 F .197(is the empty \214le)108
496.8 R F3(/de)2.697 E(v/null)-.15 E F0 5.197(.O)C .197
(therwise, the in)-5.197 F -.2(vo)-.4 G -.1(ke).2 G 2.697(dc).1 G .198
(ommand inherits the \214le descriptors of the calling shell)-2.697 F
(as modi\214ed by redirections.)108 508.8 Q/F4 10.95/Times-Bold@0 SF
(ENVIR)72 525.6 Q(ONMENT)-.329 E F0 2.344(When a program is in)108 537.6
R -.2(vo)-.4 G -.1(ke).2 G 4.843(di).1 G 4.843(ti)-4.843 G 4.843(sg)
-4.843 G -2.15 -.25(iv e)-4.843 H 4.843(na).25 G 4.843(na)-4.843 G 2.343
(rray of strings called the)-4.843 F F3(en)5.033 E(vir)-.4 E(onment)-.45
E F0 7.343(.T).68 G 2.343(his is a list of)-7.343 F F3(name)108 549.6 Q
F0<ad>A F3(value)A F0(pairs, of the form)2.5 E F3(name)2.86 E F0(=)A F3
(value)A F0(.).18 E .438(The shell pro)108 566.4 R .438(vides se)-.15 F
-.15(ve)-.25 G .438(ral w).15 F .438(ays to manipulate the en)-.1 F
2.938(vironment. On)-.4 F(in)2.938 E -.2(vo)-.4 G .438
(cation, the shell scans its o).2 F .439(wn en-)-.25 F .709(vironment a\
nd creates a parameter for each name found, automatically marking it fo\
r)108 578.4 R F3 -.2(ex)3.208 G(port).2 E F0 .708(to child pro-)3.888 F
2.703(cesses. Ex)108 590.4 R .203(ecuted commands inherit the en)-.15 F
2.703(vironment. The)-.4 F F1(export)2.703 E F0(and)2.703 E F1(declar)
2.703 E 2.703<65ad>-.18 G(x)-2.703 E F0 .203(commands allo)2.703 F 2.704
(wp)-.25 G(aram-)-2.704 E .332
(eters and functions to be added to and deleted from the en)108 602.4 R
2.832(vironment. If)-.4 F .332(the v)2.832 F .332
(alue of a parameter in the en-)-.25 F .131
(vironment is modi\214ed, the ne)108 614.4 R 2.631(wv)-.25 G .131
(alue becomes part of the en)-2.881 F .132
(vironment, replacing the old.)-.4 F .132(The en)5.132 F(vironment)-.4 E
.321(inherited by an)108 626.4 R 2.821(ye)-.15 G -.15(xe)-2.971 G .321
(cuted command consists of the shell').15 F 2.821(si)-.55 G .321
(nitial en)-2.821 F .32(vironment, whose v)-.4 F .32(alues may be modi-)
-.25 F .533(\214ed in the shell, less an)108 638.4 R 3.033(yp)-.15 G
.534(airs remo)-3.033 F -.15(ve)-.15 G 3.034(db).15 G 3.034(yt)-3.034 G
(he)-3.034 E F1(unset)3.034 E F0 .534(command, plus an)3.034 F 3.034(ya)
-.15 G .534(dditions via the)-3.034 F F1(export)3.034 E F0(and)3.034 E
F1(de-)3.034 E(clar)108 650.4 Q 2.5<65ad>-.18 G(x)-2.5 E F0(commands.)
2.5 E .563(The en)108 667.2 R .563(vironment for an)-.4 F(y)-.15 E F3
.563(simple command)3.403 F F0 .562
(or function may be augmented temporarily by pre\214xing it with)3.833 F
.202(parameter assignments, as described abo)108 679.2 R .502 -.15(ve i)
-.15 H(n).15 E F2 -.666(PA)2.702 G(RAMETERS).666 E/F5 9/Times-Roman@0 SF
(.)A F0 .202(These assignment statements af)4.702 F .203(fect only the)
-.25 F(en)108 691.2 Q(vironment seen by that command.)-.4 E .81(If the)
108 708 R F1<ad6b>3.31 E F0 .81(option is set \(see the)3.31 F F1(set)
3.31 E F0 -.2(bu)3.31 G .81(iltin command belo).2 F .81(w\), then)-.25 F
F3(all)3.64 E F0 .81(parameter assignments are placed in)3.82 F(the en)
108 720 Q
(vironment for a command, not just those that precede the command name.)
-.4 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(36)190.395 E 0 Cg
EP
%%Page: 37 37
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(When)108 84 Q/F1
10/Times-Bold@0 SF(bash)3.585 E F0(in)3.585 E -.2(vo)-.4 G -.1(ke).2 G
3.585(sa).1 G 3.585(ne)-3.585 G 1.085(xternal command, the v)-3.735 F
(ariable)-.25 E F1(_)3.585 E F0 1.086
(is set to the full \214lename of the command and)3.586 F
(passed to that command in its en)108 96 Q(vironment.)-.4 E/F2 10.95
/Times-Bold@0 SF(EXIT ST)72 112.8 Q -1.04(AT)-.986 G(US)1.04 E F0 .151
(The e)108 124.8 R .151(xit status of an e)-.15 F -.15(xe)-.15 G .151
(cuted command is the v).15 F .15(alue returned by the)-.25 F/F3 10
/Times-Italic@0 SF(waitpid)2.65 E F0 .15(system call or equi)2.65 F -.25
(va)-.25 G .15(lent func-).25 F 2.847(tion. Exit)108 136.8 R .347
(statuses f)2.847 F .347(all between 0 and 255, though, as e)-.1 F .347
(xplained belo)-.15 F 1.647 -.65(w, t)-.25 H .347(he shell may use v).65
F .348(alues abo)-.25 F .648 -.15(ve 1)-.15 H(25).15 E(specially)108
148.8 Q 5.507(.E)-.65 G .507(xit statuses from shell b)-5.507 F .507
(uiltins and compound commands are also limited to this range.)-.2 F
(Under)5.506 E(certain circumstances, the shell will use special v)108
160.8 Q(alues to indicate speci\214c f)-.25 E(ailure modes.)-.1 E -.15
(Fo)108 177.6 S 3.372(rt).15 G .872(he shell')-3.372 F 3.372(sp)-.55 G
.873(urposes, a command which e)-3.372 F .873(xits with a zero e)-.15 F
.873(xit status has succeeded.)-.15 F .873(An e)5.873 F .873
(xit status of)-.15 F .049(zero indicates success.)108 189.6 R 2.549(An)
5.049 G .049(on-zero e)-2.549 F .049(xit status indicates f)-.15 F 2.549
(ailure. When)-.1 F 2.549(ac)2.549 G .048(ommand terminates on a f)
-2.549 F .048(atal sig-)-.1 F(nal)108 201.6 Q F3(N)2.5 E F0(,)A F1(bash)
2.5 E F0(uses the v)2.5 E(alue of 128+)-.25 E F3(N)A F0(as the e)2.5 E
(xit status.)-.15 E .404
(If a command is not found, the child process created to e)108 218.4 R
-.15(xe)-.15 G .404(cute it returns a status of 127.).15 F .405
(If a command is)5.405 F(found b)108 230.4 Q(ut is not e)-.2 E -.15(xe)
-.15 G(cutable, the return status is 126.).15 E(If a command f)108 247.2
Q(ails because of an error during e)-.1 E
(xpansion or redirection, the e)-.15 E(xit status is greater than zero.)
-.15 E .081(Shell b)108 264 R .081
(uiltin commands return a status of 0 \()-.2 F F3(true)A F0 2.581(\)i)C
2.581(fs)-2.581 G .08(uccessful, and non-zero \()-2.581 F F3(false)A F0
2.58(\)i)C 2.58(fa)-2.58 G 2.58(ne)-2.58 G .08(rror occurs while)-2.58 F
(the)108 276 Q 2.967(ye)-.15 G -.15(xe)-3.117 G 2.967(cute. All).15 F
-.2(bu)2.967 G .467(iltins return an e).2 F .468
(xit status of 2 to indicate incorrect usage, generally in)-.15 F -.25
(va)-.4 G .468(lid options or).25 F(missing ar)108 288 Q(guments.)-.18 E
F1(Bash)108 304.8 Q F0 .202(itself returns the e)2.702 F .202
(xit status of the last command e)-.15 F -.15(xe)-.15 G .201
(cuted, unless a syntax error occurs, in which case).15 F(it e)108 316.8
Q(xits with a non-zero v)-.15 E 2.5(alue. See)-.25 F(also the)2.5 E F1
(exit)2.5 E F0 -.2(bu)2.5 G(iltin command belo).2 E -.65(w.)-.25 G F2
(SIGN)72 333.6 Q(ALS)-.219 E F0(When)108 345.6 Q F1(bash)2.502 E F0 .002
(is interacti)2.502 F -.15(ve)-.25 G 2.502(,i).15 G 2.502(nt)-2.502 G
.002(he absence of an)-2.502 F 2.502(yt)-.15 G .002(raps, it ignores)
-2.502 F/F4 9/Times-Bold@0 SF(SIGTERM)2.502 E F0 .002(\(so that)2.252 F
F1 .002(kill 0)2.502 F F0 .002(does not kill an in-)2.502 F(teracti)108
357.6 Q 1.216 -.15(ve s)-.25 H .916(hell\), and).15 F F4(SIGINT)3.416 E
F0 .915(is caught and handled \(so that the)3.166 F F1(wait)3.415 E F0
-.2(bu)3.415 G .915(iltin is interruptible\).).2 F .915(In all cases,)
5.915 F F1(bash)108 369.6 Q F0(ignores)2.5 E F4(SIGQ)2.5 E(UIT)-.09 E/F5
9/Times-Roman@0 SF(.)A F0(If job control is in ef)4.5 E(fect,)-.25 E F1
(bash)2.5 E F0(ignores)2.5 E F4(SIGTTIN)2.5 E F5(,)A F4(SIGTT)2.25 E(OU)
-.162 E F5(,)A F0(and)2.25 E F4(SIGTSTP)2.5 E F5(.)A F0(Non-b)108 386.4
Q 1.064(uiltin commands run by)-.2 F F1(bash)3.564 E F0(ha)3.564 E 1.365
-.15(ve s)-.2 H 1.065(ignal handlers set to the v).15 F 1.065
(alues inherited by the shell from its)-.25 F 3.248(parent. When)108
398.4 R .748(job control is not in ef)3.248 F .747
(fect, asynchronous commands ignore)-.25 F F4(SIGINT)3.247 E F0(and)
2.997 E F4(SIGQ)3.247 E(UIT)-.09 E F0 .747(in addi-)2.997 F .652
(tion to these inherited handlers.)108 410.4 R .653
(Commands run as a result of command substitution ignore the k)5.652 F
-.15(ey)-.1 G(board-).15 E(generated job control signals)108 422.4 Q F4
(SIGTTIN)2.5 E F5(,)A F4(SIGTT)2.25 E(OU)-.162 E F5(,)A F0(and)2.25 E F4
(SIGTSTP)2.5 E F5(.)A F0 2.046(The shell e)108 439.2 R 2.046
(xits by def)-.15 F 2.045(ault upon receipt of a)-.1 F F4(SIGHUP)4.545 E
F5(.)A F0 2.045(Before e)6.545 F 2.045(xiting, an interacti)-.15 F 2.345
-.15(ve s)-.25 H 2.045(hell resends the).15 F F4(SIGHUP)108 451.2 Q F0
1.004(to all jobs, running or stopped.)3.254 F 1.004
(Stopped jobs are sent)6.004 F F4(SIGCONT)3.505 E F0 1.005
(to ensure that the)3.255 F 3.505(yr)-.15 G(ecei)-3.505 E 1.305 -.15
(ve t)-.25 H(he).15 E F4(SIGHUP)108 463.2 Q F5(.)A F0 2.53 -.8(To p)5.43
H(re).8 E -.15(ve)-.25 G .93(nt the shell from sending the signal to a \
particular job, it should be remo).15 F -.15(ve)-.15 G 3.429(df).15 G
.929(rom the)-3.429 F 1.356(jobs table with the)108 475.2 R F1(diso)
3.856 E(wn)-.1 E F0 -.2(bu)3.856 G 1.356(iltin \(see).2 F F4 1.356
(SHELL B)3.856 F(UIL)-.09 E 1.356(TIN COMMANDS)-.828 F F0(belo)3.607 E
1.357(w\) or mark)-.25 F 1.357(ed to not recei)-.1 F -.15(ve)-.25 G F4
(SIGHUP)108 487.2 Q F0(using)2.25 E F1(diso)2.5 E(wn \255h)-.1 E F0(.)A
.166(If the)108 504 R F1(huponexit)2.666 E F0 .166
(shell option has been set with)2.666 F F1(shopt)2.666 E F0(,)A F1(bash)
2.666 E F0 .166(sends a)2.666 F F4(SIGHUP)2.666 E F0 .166
(to all jobs when an interacti)2.416 F -.15(ve)-.25 G(login shell e)108
516 Q(xits.)-.15 E(If)108 532.8 Q F1(bash)3.046 E F0 .546(is w)3.046 F
.546(aiting for a command to complete and recei)-.1 F -.15(ve)-.25 G
3.046(sas).15 G .546(ignal for which a trap has been set, the trap)
-3.046 F .663(will not be e)108 544.8 R -.15(xe)-.15 G .663
(cuted until the command completes.).15 F(When)5.663 E F1(bash)3.163 E
F0 .662(is w)3.163 F .662(aiting for an asynchronous command)-.1 F .326
(via the)108 556.8 R F1(wait)2.826 E F0 -.2(bu)2.826 G .327(iltin, the \
reception of a signal for which a trap has been set will cause the).2 F
F1(wait)2.827 E F0 -.2(bu)2.827 G .327(iltin to re-).2 F
(turn immediately with an e)108 568.8 Q
(xit status greater than 128, immediately after which the trap is e)-.15
E -.15(xe)-.15 G(cuted.).15 E F2(JOB CONTR)72 585.6 Q(OL)-.329 E F3 -.25
(Jo)108 597.6 S 3.369(bc).25 G(ontr)-3.369 E(ol)-.45 E F0 .868
(refers to the ability to selecti)3.879 F -.15(ve)-.25 G .868
(ly stop \().15 F F3(suspend)A F0 3.368(\)t)C .868(he e)-3.368 F -.15
(xe)-.15 G .868(cution of processes and continue \().15 F F3 -.37(re)C
(-).37 E(sume)108 609.6 Q F0 2.664(\)t)C .164(heir e)-2.664 F -.15(xe)
-.15 G .164(cution at a later point.).15 F 2.665(Au)5.165 G .165
(ser typically emplo)-2.665 F .165(ys this f)-.1 F .165
(acility via an interacti)-.1 F .465 -.15(ve i)-.25 H(nterf).15 E .165
(ace sup-)-.1 F(plied jointly by the operating system k)108 621.6 Q
(ernel')-.1 E 2.5(st)-.55 G(erminal dri)-2.5 E -.15(ve)-.25 G 2.5(ra).15
G(nd)-2.5 E F1(bash)2.5 E F0(.)A .785(The shell associates a)108 638.4 R
F3(job)5.025 E F0 .785(with each pipeline.)3.515 F .784(It k)5.785 F
.784(eeps a table of currently e)-.1 F -.15(xe)-.15 G .784
(cuting jobs, which may be).15 F .324(listed with the)108 650.4 R F1
(jobs)2.824 E F0 2.824(command. When)2.824 F F1(bash)2.825 E F0 .325
(starts a job asynchronously \(in the)2.825 F F3(bac)3.095 E(kgr)-.2 E
(ound)-.45 E F0 .325(\), it prints a line).77 F(that looks lik)108 662.4
Q(e:)-.1 E([1] 25647)144 679.2 Q .241(indicating that this job is job n\
umber 1 and that the process ID of the last process in the pipeline ass\
ociated)108 696 R .732(with this job is 25647.)108 708 R .733
(All of the processes in a single pipeline are members of the same job)
5.732 F(.)-.4 E F1(Bash)5.733 E F0(uses)3.233 E(the)108 720 Q F3(job)
4.24 E F0(abstraction as the basis for job control.)2.73 E(GNU Bash 5.1)
72 768 Q(2020 October 29)141.235 E(37)190.395 E 0 Cg EP
%%Page: 38 38
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E 1.982 -.8(To f)108
84 T .382(acilitate the implementation of the user interf).7 F .382
(ace to job control, the operating system maintains the no-)-.1 F 1.537
(tion of a)108 96 R/F1 10/Times-Italic@0 SF(curr)4.037 E 1.537
(ent terminal pr)-.37 F 1.537(ocess gr)-.45 F 1.537(oup ID)-.45 F F0
6.537(.M)C 1.538(embers of this process group \(processes whose process)
-6.537 F .023
(group ID is equal to the current terminal process group ID\) recei)108
108 R .323 -.15(ve k)-.25 H -.15(ey).05 G .023
(board-generated signals such as).15 F/F2 9/Times-Bold@0 SF(SIG-)2.522 E
(INT)108 120 Q/F3 9/Times-Roman@0 SF(.)A F0 1.215
(These processes are said to be in the)5.715 F F1(for)5.685 E -.4(eg)
-.37 G -.45(ro).4 G(und).45 E F0(.).77 E F1(Bac)6.795 E(kgr)-.2 E(ound)
-.45 E F0 1.216(processes are those whose process)4.485 F .146
(group ID dif)108 132 R .146(fers from the terminal')-.25 F .146
(s; such processes are immune to k)-.55 F -.15(ey)-.1 G .145
(board-generated signals.).15 F .145(Only fore-)5.145 F .16
(ground processes are allo)108 144 R .16(wed to read from or)-.25 F 2.66
(,i)-.4 G 2.66(ft)-2.66 G .16(he user so speci\214es with)-2.66 F/F4 10
/Courier@0 SF .16(stty tostop)2.66 F F0 2.66(,w)C .16(rite to the ter)
-2.66 F(-)-.2 E 3.052(minal. Background)108 156 R .551
(processes which attempt to read from \(write to when)3.052 F F4 .551
(stty tostop)3.051 F F0 .551(is in ef)3.051 F .551(fect\) the)-.25 F
.717(terminal are sent a)108 168 R F2 .717(SIGTTIN \(SIGTT)3.217 F(OU\))
-.162 E F0 .718(signal by the k)2.967 F(ernel')-.1 E 3.218(st)-.55 G
.718(erminal dri)-3.218 F -.15(ve)-.25 G 1.518 -.4(r, w).15 H .718
(hich, unless caught, sus-).4 F(pends the process.)108 180 Q 1.088
(If the operating system on which)108 196.8 R/F5 10/Times-Bold@0 SF
(bash)3.588 E F0 1.088(is running supports job control,)3.588 F F5(bash)
3.587 E F0 1.087(contains f)3.587 F 1.087(acilities to use it.)-.1 F -.8
(Ty)108 208.8 S .301(ping the).8 F F1(suspend)3.141 E F0 .301
(character \(typically)3.571 F F5(^Z)2.801 E F0 2.801(,C)C .301
(ontrol-Z\) while a process is running causes that process to be)-2.801
F 2.143(stopped and returns control to)108 220.8 R F5(bash)4.642 E F0
7.142(.T)C 2.142(yping the)-7.942 F F1 2.142(delayed suspend)4.992 F F0
2.142(character \(typically)5.412 F F5(^Y)4.642 E F0 4.642(,C)C
(ontrol-Y\))-4.642 E .021(causes the process to be stopped when it atte\
mpts to read input from the terminal, and control to be returned)108
232.8 R(to)108 244.8 Q F5(bash)3.392 E F0 5.892(.T)C .892
(he user may then manipulate the state of this job, using the)-5.892 F
F5(bg)3.392 E F0 .892(command to continue it in the)3.392 F .17
(background, the)108 256.8 R F5(fg)2.67 E F0 .17
(command to continue it in the fore)2.67 F .17(ground, or the)-.15 F F5
(kill)2.67 E F0 .17(command to kill it.)2.67 F(A)5.17 E F5(^Z)2.67 E F0
(tak)2.67 E .17(es ef-)-.1 F 1.419(fect immediately)108 268.8 R 3.919
(,a)-.65 G 1.418(nd has the additional side ef)-3.919 F 1.418
(fect of causing pending output and typeahead to be dis-)-.25 F(carded.)
108 280.8 Q .777(There are a number of w)108 297.6 R .777
(ays to refer to a job in the shell.)-.1 F .777(The character)5.777 F F5
(%)3.277 E F0 .777(introduces a job speci\214cation)3.277 F(\()108 309.6
Q F1(jobspec)A F0 3.458(\). Job)B(number)3.458 E F1(n)3.818 E F0 .957
(may be referred to as)3.697 F F5(%n)3.457 E F0 5.957(.A)C .957
(job may also be referred to using a pre\214x of the)-2.5 F .59(name us\
ed to start it, or using a substring that appears in its command line.)
108 321.6 R -.15(Fo)5.59 G 3.09(re).15 G(xample,)-3.24 E F5(%ce)3.09 E
F0 .59(refers to a)3.09 F .385(stopped job whose command name be)108
333.6 R .385(gins with)-.15 F F5(ce)2.885 E F0 5.385(.I)C 2.885(fap)
-5.385 G .385(re\214x matches more than one job,)-2.885 F F5(bash)2.885
E F0 .385(reports an)2.885 F(error)108 345.6 Q 5.194(.U)-.55 G(sing)
-5.194 E F5(%?ce)2.694 E F0 2.694(,o)C 2.694(nt)-2.694 G .194
(he other hand, refers to an)-2.694 F 2.694(yj)-.15 G .194
(ob containing the string)-2.694 F F5(ce)2.694 E F0 .194
(in its command line.)2.694 F .194(If the)5.194 F .306
(substring matches more than one job,)108 357.6 R F5(bash)2.806 E F0
.306(reports an error)2.806 F 5.306(.T)-.55 G .306(he symbols)-5.306 F
F5(%%)2.806 E F0(and)2.806 E F5(%+)2.806 E F0 .306(refer to the shell')
2.806 F(s)-.55 E .132(notion of the)108 369.6 R F1(curr)2.832 E .133
(ent job)-.37 F F0 2.633(,w).23 G .133
(hich is the last job stopped while it w)-2.633 F .133(as in the fore)
-.1 F .133(ground or started in the back-)-.15 F 2.576(ground. The)108
381.6 R F1(pr)3.826 E -.15(ev)-.37 G .076(ious job).15 F F0 .076
(may be referenced using)2.806 F F5<25ad>2.576 E F0 5.076(.I)C 2.576(ft)
-5.076 G .075(here is only a single job,)-2.576 F F5(%+)2.575 E F0(and)
2.575 E F5<25ad>2.575 E F0 .075(can both)2.575 F .317
(be used to refer to that job)108 393.6 R 5.317(.I)-.4 G 2.817(no)-5.317
G .317(utput pertaining to jobs \(e.g., the output of the)-2.817 F F5
(jobs)2.817 E F0 .317(command\), the current)2.817 F .033(job is al)108
405.6 R -.1(wa)-.1 G .033(ys \215agged with a).1 F F5(+)2.533 E F0 2.533
(,a)C .033(nd the pre)-2.533 F .033(vious job with a)-.25 F F5<ad>2.533
E F0 5.033(.A)C .033(single % \(with no accompan)-2.5 F .032
(ying job speci-)-.15 F(\214cation\) also refers to the current job)108
417.6 Q(.)-.4 E .443
(Simply naming a job can be used to bring it into the fore)108 434.4 R
(ground:)-.15 E F5(%1)2.944 E F0 .444(is a synon)2.944 F .444(ym for)
-.15 F F5 -.63(``)2.944 G .444(fg %1').63 F(')-.63 E F0 2.944(,b)C
(ringing)-2.944 E 1.473(job 1 from the background into the fore)108
446.4 R 3.973(ground. Similarly)-.15 F(,)-.65 E F5 -.63(``)3.972 G 1.472
(%1 &').63 F(')-.63 E F0 1.472(resumes job 1 in the background,)3.972 F
(equi)108 458.4 Q -.25(va)-.25 G(lent to).25 E F5 -.63(``)2.5 G(bg %1')
.63 E(')-.63 E F0(.)A .13(The shell learns immediately whene)108 475.2 R
-.15(ve)-.25 G 2.63(raj).15 G .13(ob changes state.)-2.63 F(Normally)
5.131 E(,)-.65 E F5(bash)2.631 E F0 -.1(wa)2.631 G .131
(its until it is about to print a).1 F .158
(prompt before reporting changes in a job')108 487.2 R 2.658(ss)-.55 G
.158(tatus so as to not interrupt an)-2.658 F 2.657(yo)-.15 G .157
(ther output.)-2.657 F .157(If the)5.157 F F5<ad62>2.657 E F0 .157
(option to)2.657 F(the)108 499.2 Q F5(set)2.647 E F0 -.2(bu)2.647 G .147
(iltin command is enabled,).2 F F5(bash)2.647 E F0 .148
(reports such changes immediately)2.648 F 5.148(.A)-.65 G .448 -.15
(ny t)-5.148 H .148(rap on).15 F F2(SIGCHLD)2.648 E F0 .148(is e)2.398 F
-.15(xe)-.15 G(-).15 E(cuted for each child that e)108 511.2 Q(xits.)
-.15 E .033(If an attempt to e)108 528 R(xit)-.15 E F5(bash)2.533 E F0
.033(is made while jobs are stopped \(or)2.533 F 2.532(,i)-.4 G 2.532
(ft)-2.532 G(he)-2.532 E F5(checkjobs)2.532 E F0 .032
(shell option has been enabled)2.532 F 1.002(using the)108 540 R F5
(shopt)3.502 E F0 -.2(bu)3.502 G 1.002
(iltin, running\), the shell prints a w).2 F 1.002
(arning message, and, if the)-.1 F F5(checkjobs)3.503 E F0 1.003
(option is en-)3.503 F .956(abled, lists the jobs and their statuses.)
108 552 R(The)5.955 E F5(jobs)3.455 E F0 .955
(command may then be used to inspect their status.)3.455 F .955(If a)
5.955 F .603(second attempt to e)108 564 R .604
(xit is made without an interv)-.15 F .604
(ening command, the shell does not print another w)-.15 F(arning,)-.1 E
(and an)108 576 Q 2.5(ys)-.15 G(topped jobs are terminated.)-2.5 E .645
(When the shell is w)108 592.8 R .645
(aiting for a job or process using the)-.1 F F5(wait)3.144 E F0 -.2(bu)
3.144 G .644(iltin, and job control is enabled,).2 F F5(wait)3.144 E F0
(will)3.144 E .282(return when the job changes state. The)108 604.8 R F5
<ad66>2.782 E F0 .282(option causes)2.782 F F5(wait)2.782 E F0 .282
(to w)2.782 F .282(ait until the job or process terminates be-)-.1 F
(fore returning.)108 616.8 Q/F6 10.95/Times-Bold@0 SF(PR)72 633.6 Q
(OMPTING)-.329 E F0 .645(When e)108 645.6 R -.15(xe)-.15 G .645
(cuting interacti).15 F -.15(ve)-.25 G(ly).15 E(,)-.65 E F5(bash)3.145 E
F0 .645(displays the primary prompt)3.145 F F2(PS1)3.145 E F0 .645
(when it is ready to read a command,)2.895 F .427
(and the secondary prompt)108 657.6 R F2(PS2)2.927 E F0 .427
(when it needs more input to complete a command.)2.677 F F5(Bash)5.428 E
F0(displays)2.928 E F2(PS0)2.928 E F0(after)2.678 E .038
(it reads a command b)108 669.6 R .038(ut before e)-.2 F -.15(xe)-.15 G
.038(cuting it.).15 F F5(Bash)5.038 E F0(displays)2.537 E F2(PS4)2.537 E
F0 .037(as described abo)2.287 F .337 -.15(ve b)-.15 H .037
(efore tracing each com-).15 F 1.121(mand when the)108 681.6 R F5<ad78>
3.621 E F0 1.122(option is enabled.)3.621 F F5(Bash)6.122 E F0(allo)
3.622 E 1.122(ws these prompt strings to be customized by inserting a)
-.25 F(number of backslash-escaped special characters that are decoded \
as follo)108 693.6 Q(ws:)-.25 E F5(\\a)144 705.6 Q F0
(an ASCII bell character \(07\))180 705.6 Q F5(\\d)144 717.6 Q F0
(the date in "W)180 717.6 Q(eekday Month Date" format \(e.g., "T)-.8 E
(ue May 26"\))-.45 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(38)
190.395 E 0 Cg EP
%%Page: 39 39
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(\\D{)144 84 Q/F2 10/Times-Italic@0 SF(format)A F1(})A F0(the)180 96 Q
F2(format)3.927 E F0 1.427(is passed to)3.927 F F2(strftime)3.927 E F0
1.427(\(3\) and the result is inserted into the prompt string; an)B
(empty)180 108 Q F2(format)2.5 E F0
(results in a locale-speci\214c time representation.)2.5 E
(The braces are required)5 E F1(\\e)144 120 Q F0
(an ASCII escape character \(033\))180 120 Q F1(\\h)144 132 Q F0
(the hostname up to the \214rst `.)180 132 Q(')-.7 E F1(\\H)144 144 Q F0
(the hostname)180 144 Q F1(\\j)144 156 Q F0
(the number of jobs currently managed by the shell)180 156 Q F1(\\l)144
168 Q F0(the basename of the shell')180 168 Q 2.5(st)-.55 G(erminal de)
-2.5 E(vice name)-.25 E F1(\\n)144 180 Q F0(ne)180 180 Q(wline)-.25 E F1
(\\r)144 192 Q F0(carriage return)180 192 Q F1(\\s)144 204 Q F0
(the name of the shell, the basename of)180 204 Q F1($0)2.5 E F0
(\(the portion follo)2.5 E(wing the \214nal slash\))-.25 E F1(\\t)144
216 Q F0(the current time in 24-hour HH:MM:SS format)180 216 Q F1(\\T)
144 228 Q F0(the current time in 12-hour HH:MM:SS format)180 228 Q F1
(\\@)144 240 Q F0(the current time in 12-hour am/pm format)180 240 Q F1
(\\A)144 252 Q F0(the current time in 24-hour HH:MM format)180 252 Q F1
(\\u)144 264 Q F0(the username of the current user)180 264 Q F1(\\v)144
276 Q F0(the v)180 276 Q(ersion of)-.15 E F1(bash)2.5 E F0
(\(e.g., 2.00\))2.5 E F1(\\V)144 288 Q F0(the release of)180 288 Q F1
(bash)2.5 E F0 2.5(,v)C(ersion + patch le)-2.65 E -.15(ve)-.25 G 2.5
(l\().15 G(e.g., 2.00.0\))-2.5 E F1(\\w)144 300 Q F0 .115(the current w)
180 300 R .115(orking directory)-.1 F 2.615(,w)-.65 G(ith)-2.615 E/F3 9
/Times-Bold@0 SF($HOME)2.615 E F0(abbre)2.365 E .116
(viated with a tilde \(uses the v)-.25 F .116(alue of the)-.25 F F3(PR)
180 312 Q(OMPT_DIR)-.27 E(TRIM)-.36 E F0 -.25(va)2.25 G(riable\)).25 E
F1(\\W)144 324 Q F0(the basename of the current w)180 324 Q
(orking directory)-.1 E 2.5(,w)-.65 G(ith)-2.5 E F3($HOME)2.5 E F0
(abbre)2.25 E(viated with a tilde)-.25 E F1(\\!)144 336 Q F0
(the history number of this command)180 336 Q F1(\\#)144 348 Q F0
(the command number of this command)180 348 Q F1(\\$)144 360 Q F0
(if the ef)180 360 Q(fecti)-.25 E .3 -.15(ve U)-.25 H(ID is 0, a).15 E
F1(#)2.5 E F0 2.5(,o)C(therwise a)-2.5 E F1($)2.5 E(\\)144 372 Q F2(nnn)
A F0(the character corresponding to the octal number)180 372 Q F2(nnn)
2.5 E F1(\\\\)144 384 Q F0 2.5(ab)180 384 S(ackslash)-2.5 E F1(\\[)144
396 Q F0(be)180 396 Q 1.257(gin a sequence of non-printing characters, \
which could be used to embed a terminal)-.15 F
(control sequence into the prompt)180 408 Q F1(\\])144 420 Q F0
(end a sequence of non-printing characters)180 420 Q .119
(The command number and the history number are usually dif)108 436.8 R
.12(ferent: the history number of a command is its)-.25 F .547(position\
 in the history list, which may include commands restored from the hist\
ory \214le \(see)108 448.8 R F3(HIST)3.046 E(OR)-.162 E(Y)-.315 E F0
(be-)2.796 E(lo)108 460.8 Q .354(w\), while the command number is the p\
osition in the sequence of commands e)-.25 F -.15(xe)-.15 G .355
(cuted during the current).15 F .823(shell session.)108 472.8 R .822
(After the string is decoded, it is e)5.823 F .822
(xpanded via parameter e)-.15 F .822(xpansion, command substitution,)
-.15 F .682(arithmetic e)108 484.8 R .682(xpansion, and quote remo)-.15
F -.25(va)-.15 G .682(l, subject to the v).25 F .683(alue of the)-.25 F
F1(pr)3.183 E(omptv)-.18 E(ars)-.1 E F0 .683(shell option \(see the de-)
3.183 F 1.198(scription of the)108 496.8 R F1(shopt)3.698 E F0 1.198
(command under)3.698 F F3 1.197(SHELL B)3.697 F(UIL)-.09 E 1.197
(TIN COMMANDS)-.828 F F0(belo)3.447 E 3.697(w\). This)-.25 F 1.197
(can ha)3.697 F 1.497 -.15(ve u)-.2 H(nw).15 E(anted)-.1 E .322(side ef)
108 508.8 R .322(fects if escaped portions of the string appear within \
command substitution or contain characters spe-)-.25 F(cial to w)108
520.8 Q(ord e)-.1 E(xpansion.)-.15 E/F4 10.95/Times-Bold@0 SF(READLINE)
72 537.6 Q F0 .151
(This is the library that handles reading input when using an interacti)
108 549.6 R .45 -.15(ve s)-.25 H .15(hell, unless the).15 F F1
(\255\255noediting)2.65 E F0(option)2.65 E .384(is gi)108 561.6 R -.15
(ve)-.25 G 2.884(na).15 G 2.884(ts)-2.884 G .384(hell in)-2.884 F -.2
(vo)-.4 G 2.884(cation. Line).2 F .384
(editing is also used when using the)2.884 F F1<ad65>2.885 E F0 .385
(option to the)2.885 F F1 -.18(re)2.885 G(ad).18 E F0 -.2(bu)2.885 G
2.885(iltin. By).2 F(de-)2.885 E -.1(fa)108 573.6 S 1.407
(ult, the line editing commands are similar to those of Emacs.).1 F
3.906(Av)6.406 G 1.406(i-style line editing interf)-3.906 F 1.406
(ace is also)-.1 F -.2(av)108 585.6 S 3.35(ailable. Line)-.05 F .85
(editing can be enabled at an)3.35 F 3.35(yt)-.15 G .85(ime using the)
-3.35 F F1 .85(\255o emacs)3.35 F F0(or)3.35 E F1 .85(\255o vi)3.35 F F0
.85(options to the)3.35 F F1(set)3.35 E F0 -.2(bu)3.35 G(iltin).2 E
(\(see)108 597.6 Q F3 .763(SHELL B)3.263 F(UIL)-.09 E .763(TIN COMMANDS)
-.828 F F0(belo)3.013 E 3.263(w\). T)-.25 F 3.263(ot)-.8 G .763(urn of)
-3.263 F 3.263(fl)-.25 G .763
(ine editing after the shell is running, use the)-3.263 F F1(+o)3.262 E
(emacs)108 609.6 Q F0(or)2.5 E F1(+o vi)2.5 E F0(options to the)2.5 E F1
(set)2.5 E F0 -.2(bu)2.5 G(iltin.).2 E F1(Readline Notation)87 626.4 Q
F0 .463(In this section, the Emacs-style notation is used to denote k)
108 638.4 R -.15(ey)-.1 G(strok).15 E 2.963(es. Control)-.1 F -.1(ke)
2.963 G .463(ys are denoted by C\255)-.05 F F2 -.1(ke)C(y)-.2 E F0(,)A
1.153(e.g., C\255n means Control\255N.)108 650.4 R(Similarly)6.153 E(,)
-.65 E F2(meta)4.033 E F0 -.1(ke)3.913 G 1.153(ys are denoted by M\255)
-.05 F F2 -.1(ke)C(y)-.2 E F0 3.652(,s)C 3.652(oM)-3.652 G 1.152
(\255x means Meta\255X.)-3.652 F(\(On)6.152 E -.1(ke)108 662.4 S .83
(yboards without a)-.05 F F2(meta)3.71 E F0 -.1(ke)3.59 G 2.13 -.65
(y, M)-.05 H<ad>.65 E F2(x)A F0 .83(means ESC)3.33 F F2(x)3.33 E F0 3.33
(,i)C .831(.e., press the Escape k)-3.33 F 1.131 -.15(ey t)-.1 H .831
(hen the).15 F F2(x)4.101 E F0 -.1(ke)3.861 G 4.631 -.65(y. T)-.05 H
.831(his mak).65 F(es)-.1 E .6(ESC the)108 674.4 R F2 .6(meta pr)3.1 F
(e\214x)-.37 E F0 5.6(.T)C .6(he combination M\255C\255)-5.6 F F2(x)A F0
.599(means ESC\255Control\255)3.099 F F2(x)A F0 3.099(,o)C 3.099(rp)
-3.099 G .599(ress the Escape k)-3.099 F .899 -.15(ey t)-.1 H .599
(hen hold).15 F(the Control k)108 686.4 Q .3 -.15(ey w)-.1 H
(hile pressing the).15 E F2(x)3.27 E F0 -.1(ke)3.03 G -.65(y.)-.05 G(\))
.65 E .595(Readline commands may be gi)108 703.2 R -.15(ve)-.25 G 3.096
(nn).15 G(umeric)-3.096 E F2(ar)3.426 E(guments)-.37 E F0 3.096(,w).27 G
.596(hich normally act as a repeat count.)-3.096 F(Sometimes,)5.596 E
(ho)108 715.2 Q(we)-.25 E -.15(ve)-.25 G 1.419 -.4(r, i).15 H 3.119(ti)
.4 G 3.119(st)-3.119 G .619(he sign of the ar)-3.119 F .619
(gument that is signi\214cant.)-.18 F -.15(Pa)5.619 G .619(ssing a ne)
.15 F -.05(ga)-.15 G(ti).05 E .919 -.15(ve a)-.25 H -.18(rg).15 G .619
(ument to a command that).18 F 2.938(acts in the forw)108 727.2 R 2.938
(ard direction \(e.g.,)-.1 F F1(kill\255line)5.438 E F0 5.438(\)c)C
2.938(auses that command to act in a backw)-5.438 F 2.938
(ard direction.)-.1 F(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E
(39)190.395 E 0 Cg EP
%%Page: 40 40
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E
(Commands whose beha)108 84 Q(vior with ar)-.2 E(guments de)-.18 E
(viates from this are noted belo)-.25 E -.65(w.)-.25 G .812
(When a command is described as)108 100.8 R/F1 10/Times-Italic@0 SF
(killing)3.311 E F0(te)3.311 E .811(xt, the te)-.15 F .811
(xt deleted is sa)-.15 F -.15(ve)-.2 G 3.311(df).15 G .811
(or possible future retrie)-3.311 F -.25(va)-.25 G 3.311(l\().25 G F1
(yank-)-3.311 E(ing)108 112.8 Q F0 2.529(\). The)B .029(killed te)2.529
F .029(xt is sa)-.15 F -.15(ve)-.2 G 2.529(di).15 G 2.529(na)-2.529 G F1
.029(kill ring)B F0 5.029(.C)C(onsecuti)-5.029 E .329 -.15(ve k)-.25 H
.029(ills cause the te).15 F .029(xt to be accumulated into one unit,)
-.15 F .567(which can be yank)108 124.8 R .567(ed all at once.)-.1 F
.567(Commands which do not kill te)5.567 F .567
(xt separate the chunks of te)-.15 F .567(xt on the kill)-.15 F(ring.)
108 136.8 Q/F2 10/Times-Bold@0 SF(Readline Initialization)87 153.6 Q F0
.091(Readline is customized by putting commands in an initialization \
\214le \(the)108 165.6 R F1(inputr)2.591 E(c)-.37 E F0 2.591
(\214le\). The)2.591 F .092(name of this \214le)2.591 F .573(is tak)108
177.6 R .573(en from the v)-.1 F .573(alue of the)-.25 F/F3 9
/Times-Bold@0 SF(INPUTRC)3.073 E F0 -.25(va)2.823 G 3.073(riable. If).25
F .573(that v)3.073 F .573(ariable is unset, the def)-.25 F .573
(ault is)-.1 F F1(~/.inputr)2.573 E(c)-.37 E F0 5.572(.I).31 G 3.072(ft)
-5.572 G(hat)-3.072 E 3.061(\214le does)108 189.6 R .561(not e)3.061 F
.562(xist or cannot be read, the ultimate def)-.15 F .562(ault is)-.1 F
F1(/etc/inputr)4.212 E(c)-.37 E F0 5.562(.W).31 G .562
(hen a program which uses the)-5.562 F .175(readline library starts up,\
 the initialization \214le is read, and the k)108 201.6 R .474 -.15
(ey b)-.1 H .174(indings and v).15 F .174(ariables are set.)-.25 F .174
(There are)5.174 F .238(only a fe)108 213.6 R 2.738(wb)-.25 G .238
(asic constructs allo)-2.738 F .239
(wed in the readline initialization \214le.)-.25 F .239
(Blank lines are ignored.)5.239 F .239(Lines be)5.239 F(gin-)-.15 E .554
(ning with a)108 225.6 R F2(#)3.054 E F0 .554(are comments.)3.054 F .554
(Lines be)5.554 F .554(ginning with a)-.15 F F2($)3.054 E F0 .554
(indicate conditional constructs.)3.054 F .553(Other lines denote)5.553
F -.1(ke)108 237.6 S 2.5(yb)-.05 G(indings and v)-2.5 E
(ariable settings.)-.25 E .986(The def)108 254.4 R .986(ault k)-.1 F
-.15(ey)-.1 G .987(-bindings may be changed with an).15 F F1(inputr)
3.497 E(c)-.37 E F0 3.487(\214le. Other)3.797 F .987
(programs that use this library may)3.487 F(add their o)108 266.4 Q
(wn commands and bindings.)-.25 E -.15(Fo)108 283.2 S 2.5(re).15 G
(xample, placing)-2.65 E(M\255Control\255u: uni)144 300 Q -.15(ve)-.25 G
(rsal\255ar).15 E(gument)-.18 E(or)108 312 Q(C\255Meta\255u: uni)144 324
Q -.15(ve)-.25 G(rsal\255ar).15 E(gument)-.18 E(into the)108 336 Q F1
(inputr)2.51 E(c)-.37 E F0 -.1(wo)2.81 G(uld mak).1 E 2.5(eM)-.1 G
(\255C\255u e)-2.5 E -.15(xe)-.15 G(cute the readline command).15 E F1
(univer)2.58 E(sal\255ar)-.1 E(gument)-.37 E F0(.).68 E 1.011(The follo)
108 352.8 R 1.011(wing symbolic character names are recognized:)-.25 F
F1 -.4(RU)3.511 G(BOUT).4 E F0(,)1.27 E F1(DEL)4.091 E F0(,).53 E F1
(ESC)4.021 E F0(,).72 E F1(LFD)4.091 E F0(,).28 E F1(NEWLINE)4.21 E F0
(,).73 E F1(RET)4.14 E F0(,)1.27 E F1(RETURN)108.63 364.8 Q F0(,)1.1 E
F1(SPC)2.83 E F0(,).72 E F1(SP)2.83 E -.3(AC)-.9 G(E).3 E F0 2.5(,a).73
G(nd)-2.5 E F1 -.5(TA)2.5 G(B).5 E F0(.).27 E .209
(In addition to command names, readline allo)108 381.6 R .209(ws k)-.25
F -.15(ey)-.1 G 2.709(st).15 G 2.709(ob)-2.709 G 2.709(eb)-2.709 G .209
(ound to a string that is inserted when the k)-2.709 F .509 -.15(ey i)
-.1 H(s).15 E(pressed \(a)108 393.6 Q F1(macr)2.5 E(o)-.45 E F0(\).)A F2
(Readline K)87 410.4 Q(ey Bindings)-.25 E F0 .366
(The syntax for controlling k)108 422.4 R .666 -.15(ey b)-.1 H .366
(indings in the).15 F F1(inputr)2.876 E(c)-.37 E F0 .366
(\214le is simple.)3.176 F .366(All that is required is the name of the)
5.366 F .263(command or the te)108 434.4 R .264(xt of a macro and a k)
-.15 F .564 -.15(ey s)-.1 H .264(equence to which it should be bound.)
.15 F .264(The name may be speci-)5.264 F .139(\214ed in one of tw)108
446.4 R 2.638(ow)-.1 G .138(ays: as a symbolic k)-2.738 F .438 -.15
(ey n)-.1 H .138(ame, possibly with).15 F F1(Meta\255)2.638 E F0(or)
2.638 E F1(Contr)2.638 E(ol\255)-.45 E F0(pre\214x)2.638 E .138
(es, or as a k)-.15 F .438 -.15(ey s)-.1 H(e-).15 E(quence.)108 458.4 Q
.16(When using the form)108 475.2 R F2 -.1(ke)2.66 G(yname).1 E F0(:)A
F1(function\255name).833 E F0(or)2.66 E F1(macr)2.66 E(o)-.45 E F0(,)A
F1 -.1(ke)2.66 G(yname)-.2 E F0 .161(is the name of a k)2.84 F .461 -.15
(ey s)-.1 H .161(pelled out in Eng-).15 F 2.5(lish. F)108 487.2 R(or e)
-.15 E(xample:)-.15 E(Control-u: uni)144 511.2 Q -.15(ve)-.25 G
(rsal\255ar).15 E(gument)-.18 E(Meta-Rubout: backw)144 523.2 Q
(ard-kill-w)-.1 E(ord)-.1 E(Control-o: "> output")144 535.2 Q .699
(In the abo)108 552 R .998 -.15(ve ex)-.15 H(ample,).15 E F1(C\255u)
3.038 E F0 .698(is bound to the function)3.448 F F2(uni)3.198 E -.1(ve)
-.1 G(rsal\255ar).1 E(gument)-.1 E F0(,)A F1(M\255DEL)3.878 E F0 .698
(is bound to the func-)3.728 F(tion)108 564 Q F2(backward\255kill\255w)
2.758 E(ord)-.1 E F0 2.758(,a)C(nd)-2.758 E F1(C\255o)2.598 E F0 .258
(is bound to run the macro e)2.938 F .259
(xpressed on the right hand side \(that is, to)-.15 F(insert the te)108
576 Q(xt)-.15 E/F4 10/Courier@0 SF 6(>o)2.5 G(utput)-6 E F0
(into the line\).)2.5 E .056(In the second form,)108 592.8 R F2("k)2.556
E(eyseq")-.1 E F0(:)A F1(function\255name).833 E F0(or)2.556 E F1(macr)
2.556 E(o)-.45 E F0(,)A F2 -.1(ke)2.556 G(yseq).1 E F0(dif)2.555 E .055
(fers from)-.25 F F2 -.1(ke)2.555 G(yname).1 E F0(abo)2.555 E .355 -.15
(ve i)-.15 H 2.555(nt).15 G .055(hat strings)-2.555 F 1.284
(denoting an entire k)108 604.8 R 1.584 -.15(ey s)-.1 H 1.284(equence m\
ay be speci\214ed by placing the sequence within double quotes.).15 F
(Some)6.284 E .386(GNU Emacs style k)108 616.8 R .686 -.15(ey e)-.1 H
.385(scapes can be used, as in the follo).15 F .385(wing e)-.25 F .385
(xample, b)-.15 F .385(ut the symbolic character names)-.2 F
(are not recognized.)108 628.8 Q("\\C\255u": uni)144 652.8 Q -.15(ve)
-.25 G(rsal\255ar).15 E(gument)-.18 E
("\\C\255x\\C\255r": re\255read\255init\255\214le)144 664.8 Q
("\\e[11~": "Function K)144 676.8 Q .3 -.15(ey 1)-.25 H(").15 E .314
(In this e)108 693.6 R(xample,)-.15 E F1(C\255u)2.654 E F0 .314(is ag)
3.064 F .315(ain bound to the function)-.05 F F2(uni)2.815 E -.1(ve)-.1
G(rsal\255ar).1 E(gument)-.1 E F0(.)A F1 .315(C\255x C\255r)5.155 F F0
.315(is bound to the func-)3.545 F(tion)108 705.6 Q F2 -.18(re)2.5 G
<ad72>.18 E(ead\255init\255\214le)-.18 E F0 2.5(,a)C(nd)-2.5 E F1
(ESC [ 1 1 ~)3.01 E F0(is bound to insert the te)3.94 E(xt)-.15 E F4
(Function Key 1)2.5 E F0(.)A
(The full set of GNU Emacs style escape sequences is)108 722.4 Q
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(40)190.395 E 0 Cg EP
%%Page: 41 41
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF<5c43ad>144 84 Q F0(control pre\214x)180 84 Q F1<5c4dad>144 96 Q F0
(meta pre\214x)180 96 Q F1(\\e)144 108 Q F0(an escape character)180 108
Q F1(\\\\)144 120 Q F0(backslash)180 120 Q F1(\\")144 132 Q F0
(literal ")180 132 Q F1<5c08>144 144 Q F0(literal \010)180 144 Q(In add\
ition to the GNU Emacs style escape sequences, a second set of backslas\
h escapes is a)108 160.8 Q -.25(va)-.2 G(ilable:).25 E F1(\\a)144 172.8
Q F0(alert \(bell\))180 172.8 Q F1(\\b)144 184.8 Q F0(backspace)180
184.8 Q F1(\\d)144 196.8 Q F0(delete)180 196.8 Q F1(\\f)144 208.8 Q F0
(form feed)180 208.8 Q F1(\\n)144 220.8 Q F0(ne)180 220.8 Q(wline)-.25 E
F1(\\r)144 232.8 Q F0(carriage return)180 232.8 Q F1(\\t)144 244.8 Q F0
(horizontal tab)180 244.8 Q F1(\\v)144 256.8 Q F0 -.15(ve)180 256.8 S
(rtical tab).15 E F1(\\)144 268.8 Q/F2 10/Times-Italic@0 SF(nnn)A F0
(the eight-bit character whose v)180 268.8 Q(alue is the octal v)-.25 E
(alue)-.25 E F2(nnn)2.5 E F0(\(one to three digits\))2.5 E F1(\\x)144
280.8 Q F2(HH)A F0(the eight-bit character whose v)180 280.8 Q
(alue is the he)-.25 E(xadecimal v)-.15 E(alue)-.25 E F2(HH)2.5 E F0
(\(one or tw)2.5 E 2.5(oh)-.1 G .3 -.15(ex d)-2.5 H(igits\)).15 E 1.142
(When entering the te)108 297.6 R 1.141(xt of a macro, single or double\
 quotes must be used to indicate a macro de\214nition.)-.15 F .089
(Unquoted te)108 309.6 R .089(xt is assumed to be a function name.)-.15
F .09(In the macro body)5.089 F 2.59(,t)-.65 G .09
(he backslash escapes described abo)-2.59 F -.15(ve)-.15 G(are e)108
321.6 Q 2.5(xpanded. Backslash)-.15 F(will quote an)2.5 E 2.5(yo)-.15 G
(ther character in the macro te)-2.5 E(xt, including " and \010.)-.15 E
F1(Bash)108 338.4 Q F0(allo)2.93 E .43(ws the current readline k)-.25 F
.73 -.15(ey b)-.1 H .429(indings to be displayed or modi\214ed with the)
.15 F F1(bind)2.929 E F0 -.2(bu)2.929 G .429(iltin command.).2 F .045
(The editing mode may be switched during interacti)108 350.4 R .345 -.15
(ve u)-.25 H .046(se by using the).15 F F1<ad6f>2.546 E F0 .046
(option to the)2.546 F F1(set)2.546 E F0 -.2(bu)2.546 G .046
(iltin command).2 F(\(see)108 362.4 Q/F3 9/Times-Bold@0 SF(SHELL B)2.5 E
(UIL)-.09 E(TIN COMMANDS)-.828 E F0(belo)2.25 E(w\).)-.25 E F1
(Readline V)87 379.2 Q(ariables)-.92 E F0 .044(Readline has v)108 391.2
R .043(ariables that can be used to further customize its beha)-.25 F
(vior)-.2 E 5.043(.A)-.55 G -.25(va)-2.5 G .043
(riable may be set in the).25 F F2(inpu-)2.553 E(tr)108 403.2 Q(c)-.37 E
F0(\214le with a statement of the form)2.81 E F1(set)144 420 Q F2
(variable\255name value)2.5 E F0(or using the)108 432 Q F1(bind)2.5 E F0
-.2(bu)2.5 G(iltin command \(see).2 E F3(SHELL B)2.5 E(UIL)-.09 E
(TIN COMMANDS)-.828 E F0(belo)2.25 E(w\).)-.25 E .79
(Except where noted, readline v)108 448.8 R .79(ariables can tak)-.25 F
3.29(et)-.1 G .79(he v)-3.29 F(alues)-.25 E F1(On)3.29 E F0(or)3.29 E F1
(Off)3.29 E F0 .79(\(without re)3.29 F -.05(ga)-.15 G .79(rd to case\).)
.05 F(Unrecog-)5.79 E .449(nized v)108 460.8 R .448
(ariable names are ignored.)-.25 F .448(When a v)5.448 F .448(ariable v)
-.25 F .448(alue is read, empty or null v)-.25 F .448
(alues, "on" \(case-insensi-)-.25 F(ti)108 472.8 Q -.15(ve)-.25 G .467
(\), and "1" are equi).15 F -.25(va)-.25 G .468(lent to).25 F F1(On)
2.968 E F0 5.468(.A)C .468(ll other v)-5.468 F .468(alues are equi)-.25
F -.25(va)-.25 G .468(lent to).25 F F1(Off)2.968 E F0 5.468(.T)C .468
(he v)-5.468 F .468(ariables and their def)-.25 F(ault)-.1 E -.25(va)108
484.8 S(lues are:).25 E F1(bell\255style \(audible\))108 501.6 Q F0 .011
(Controls what happens when readline w)144 513.6 R .011
(ants to ring the terminal bell.)-.1 F .01(If set to)5.01 F F1(none)2.51
E F0 2.51(,r)C .01(eadline ne)-2.51 F -.15(ve)-.25 G(r).15 E .94
(rings the bell.)144 525.6 R .94(If set to)5.94 F F1(visible)3.44 E F0
3.44(,r)C .94(eadline uses a visible bell if one is a)-3.44 F -.25(va)
-.2 G 3.44(ilable. If).25 F .94(set to)3.44 F F1(audible)3.44 E F0(,)A
(readline attempts to ring the terminal')144 537.6 Q 2.5(sb)-.55 G(ell.)
-2.5 E F1(bind\255tty\255special\255chars \(On\))108 549.6 Q F0 .056
(If set to)144 561.6 R F1(On)2.556 E F0 2.556(,r)C .056(eadline attempt\
s to bind the control characters treated specially by the k)-2.556 F
(ernel')-.1 E 2.555(st)-.55 G(ermi-)-2.555 E(nal dri)144 573.6 Q -.15
(ve)-.25 G 2.5(rt).15 G 2.5(ot)-2.5 G(heir readline equi)-2.5 E -.25(va)
-.25 G(lents.).25 E F1(blink\255matching\255par)108 585.6 Q(en \(Off\))
-.18 E F0 .21(If set to)144 597.6 R F1(On)2.71 E F0 2.71(,r)C .21
(eadline attempts to brie\215y mo)-2.71 F .51 -.15(ve t)-.15 H .21
(he cursor to an opening parenthesis when a closing).15 F
(parenthesis is inserted.)144 609.6 Q F1(color)108 621.6 Q
(ed\255completion\255pr)-.18 E(e\214x \(Off\))-.18 E F0 .515(If set to)
144 633.6 R F1(On)3.015 E F0 3.015(,w)C .515(hen listing completions, r\
eadline displays the common pre\214x of the set of possible)-3.015 F
2.935(completions using a dif)144 645.6 R 2.935(ferent color)-.25 F
7.936(.T)-.55 G 2.936(he color de\214nitions are tak)-7.936 F 2.936
(en from the v)-.1 F 2.936(alue of the)-.25 F F1(LS_COLORS)144 657.6 Q
F0(en)2.5 E(vironment v)-.4 E(ariable.)-.25 E F1(color)108 669.6 Q
(ed\255stats \(Off\))-.18 E F0 1.58(If set to)144 681.6 R F1(On)4.08 E
F0 4.08(,r)C 1.579(eadline displays possible completions using dif)-4.08
F 1.579(ferent colors to indicate their \214le)-.25 F 2.5(type. The)144
693.6 R(color de\214nitions are tak)2.5 E(en from the v)-.1 E
(alue of the)-.25 E F1(LS_COLORS)2.5 E F0(en)2.5 E(vironment v)-.4 E
(ariable.)-.25 E F1(comment\255begin \(`)108 705.6 Q(`#')-.63 E('\))-.63
E F0 .884(The string that is inserted when the readline)144 717.6 R F1
(insert\255comment)3.385 E F0 .885(command is e)3.385 F -.15(xe)-.15 G
3.385(cuted. This).15 F(com-)3.385 E(mand is bound to)144 729.6 Q F1
(M\255#)2.5 E F0(in emacs mode and to)2.5 E F1(#)2.5 E F0
(in vi command mode.)2.5 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235
E(41)190.395 E 0 Cg EP
%%Page: 42 42
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(completion\255display\255width \(\2551\))108 84 Q F0 1.453(The numbe\
r of screen columns used to display possible matches when performing co\
mpletion.)144 96 R .193(The v)144 108 R .193(alue is ignored if it is l\
ess than 0 or greater than the terminal screen width.)-.25 F 2.694(Av)
5.194 G .194(alue of 0 will)-2.944 F
(cause matches to be displayed one per line.)144 120 Q(The def)5 E
(ault v)-.1 E(alue is \2551.)-.25 E F1(completion\255ignor)108 132 Q
(e\255case \(Off\))-.18 E F0(If set to)144 144 Q F1(On)2.5 E F0 2.5(,r)C
(eadline performs \214lename matching and completion in a case\255insen\
siti)-2.5 E .3 -.15(ve f)-.25 H(ashion.).05 E F1
(completion\255map\255case \(Off\))108 156 Q F0 .094(If set to)144 168 R
F1(On)2.593 E F0 2.593(,a)C(nd)-2.593 E F1(completion\255ignor)2.593 E
(e\255case)-.18 E F0 .093(is enabled, readline treats h)2.593 F .093
(yphens \()-.05 F/F2 10/Times-Italic@0 SF<ad>A F0 2.593(\)a)C .093
(nd underscores)-2.593 F(\()144 180 Q F2(_)A F0 2.5(\)a)C 2.5(se)-2.5 G
(qui)-2.5 E -.25(va)-.25 G(lent when performing case\255insensiti).25 E
.3 -.15(ve \214)-.25 H(lename matching and completion.).15 E F1
(completion\255pr)108 192 Q(e\214x\255display\255length \(0\))-.18 E F0
.829(The length in characters of the common pre\214x of a list of possi\
ble completions that is displayed)144 204 R 1.275
(without modi\214cation.)144 216 R 1.275(When set to a v)6.275 F 1.274
(alue greater than zero, common pre\214x)-.25 F 1.274
(es longer than this)-.15 F -.25(va)144 228 S(lue are replaced with an \
ellipsis when displaying possible completions.).25 E F1
(completion\255query\255items \(100\))108 240 Q F0 .529
(This determines when the user is queried about vie)144 252 R .53
(wing the number of possible completions gen-)-.25 F .561(erated by the)
144 264 R F1(possible\255completions)3.061 E F0 3.061(command. It)3.061
F .561(may be set to an)3.061 F 3.06(yi)-.15 G(nte)-3.06 E .56(ger v)
-.15 F .56(alue greater than or)-.25 F .782(equal to zero.)144 276 R
.783(If the number of possible completions is greater than or equal to \
the v)5.782 F .783(alue of this)-.25 F -.25(va)144 288 S .368
(riable, readline will ask whether or not the user wishes to vie).25 F
2.867(wt)-.25 G .367(hem; otherwise the)-2.867 F 2.867(ya)-.15 G .367
(re simply)-2.867 F(listed on the terminal.)144 300 Q F1(con)108 312 Q
-.1(ve)-.4 G(rt\255meta \(On\)).1 E F0 .612(If set to)144 324 R F1(On)
3.112 E F0 3.112(,r)C .613(eadline will con)-3.112 F -.15(ve)-.4 G .613
(rt characters with the eighth bit set to an ASCII k).15 F .913 -.15
(ey s)-.1 H .613(equence by).15 F .541
(stripping the eighth bit and pre\214xing an escape character \(in ef)
144 336 R .541(fect, using escape as the)-.25 F F2 .541(meta pr)3.041 F
(e-)-.37 E<8c78>144 348 Q F0 2.5(\). The)B(def)2.5 E(ault is)-.1 E F2
(On)2.5 E F0 2.5(,b)C(ut readline will set it to)-2.7 E F2(Of)2.5 E(f)
-.18 E F0(if the locale contains eight-bit characters.)2.5 E F1
(disable\255completion \(Off\))108 360 Q F0 .038(If set to)144 372 R F1
(On)2.538 E F0 2.538(,r)C .038(eadline will inhibit w)-2.538 F .038
(ord completion.)-.1 F .038
(Completion characters will be inserted into the)5.038 F(line as if the)
144 384 Q 2.5(yh)-.15 G(ad been mapped to)-2.5 E F1(self-insert)2.5 E F0
(.)A F1(echo\255contr)108 396 Q(ol\255characters \(On\))-.18 E F0 1.211
(When set to)144 408 R F1(On)3.711 E F0 3.711(,o)C 3.711(no)-3.711 G
1.211(perating systems that indicate the)-3.711 F 3.711(ys)-.15 G 1.21
(upport it, readline echoes a character)-3.711 F
(corresponding to a signal generated from the k)144 420 Q -.15(ey)-.1 G
(board.).15 E F1(editing\255mode \(emacs\))108 432 Q F0 .141
(Controls whether readline be)144 444 R .141(gins with a set of k)-.15 F
.441 -.15(ey b)-.1 H .141(indings similar to).15 F F2(Emacs)2.642 E F0
(or)2.642 E F2(vi)2.642 E F0(.)A F1(editing\255mode)5.142 E F0
(can be set to either)144 456 Q F1(emacs)2.5 E F0(or)2.5 E F1(vi)2.5 E
F0(.)A F1(emacs\255mode\255string \(@\))108 468 Q F0 .518(If the)144 480
R F2(show\255mode\255in\255pr)3.018 E(ompt)-.45 E F0 -.25(va)3.018 G
.517(riable is enabled, this string is displayed immediately before the)
.25 F .622
(last line of the primary prompt when emacs editing mode is acti)144 492
R -.15(ve)-.25 G 5.622(.T).15 G .622(he v)-5.622 F .622(alue is e)-.25 F
.622(xpanded lik)-.15 F 3.122(ea)-.1 G -.1(ke)144 504 S 3.34(yb)-.05 G
.839(inding, so the standard set of meta- and control pre\214x)-3.34 F
.839(es and backslash escape sequences is)-.15 F -.2(av)144 516 S 2.798
(ailable. Use)-.05 F .298(the \\1 and \\2 escapes to be)2.798 F .298
(gin and end sequences of non-printing characters, which)-.15 F
(can be used to embed a terminal control sequence into the mode string.)
144 528 Q F1(enable\255brack)108 540 Q(eted\255paste \(On\))-.1 E F0
1.222(When set to)144 552 R F1(On)3.721 E F0 3.721(,r)C 1.221
(eadline will con\214gure the terminal in a w)-3.721 F 1.221
(ay that will enable it to insert each)-.1 F .353
(paste into the editing b)144 564 R(uf)-.2 E .353(fer as a single strin\
g of characters, instead of treating each character as if)-.25 F .544
(it had been read from the k)144 576 R -.15(ey)-.1 G 3.043(board. This)
.15 F .543(can pre)3.043 F -.15(ve)-.25 G .543
(nt pasted characters from being interpreted as).15 F(editing commands.)
144 588 Q F1(enable\255k)108 600 Q(eypad \(Off\))-.1 E F0 .892
(When set to)144 612 R F1(On)3.393 E F0 3.393(,r)C .893
(eadline will try to enable the application k)-3.393 F -.15(ey)-.1 G
.893(pad when it is called.).15 F .893(Some sys-)5.893 F
(tems need this to enable the arro)144 624 Q 2.5(wk)-.25 G -.15(ey)-2.6
G(s.).15 E F1(enable\255meta\255k)108 636 Q(ey \(On\))-.1 E F0 .64
(When set to)144 648 R F1(On)3.14 E F0 3.14(,r)C .64
(eadline will try to enable an)-3.14 F 3.14(ym)-.15 G .64
(eta modi\214er k)-3.14 F .94 -.15(ey t)-.1 H .64
(he terminal claims to support).15 F(when it is called.)144 660 Q
(On man)5 E 2.5(yt)-.15 G(erminals, the meta k)-2.5 E .3 -.15(ey i)-.1 H
2.5(su).15 G(sed to send eight-bit characters.)-2.5 E F1
(expand\255tilde \(Off\))108 672 Q F0(If set to)144 684 Q F1(On)2.5 E F0
2.5(,t)C(ilde e)-2.5 E(xpansion is performed when readline attempts w)
-.15 E(ord completion.)-.1 E F1(history\255pr)108 696 Q(eser)-.18 E -.1
(ve)-.1 G(\255point \(Off\)).1 E F0 .552(If set to)144 708 R F1(On)3.052
E F0 3.052(,t)C .552(he history code attempts to place point at the sam\
e location on each history line re-)-3.052 F(trie)144 720 Q -.15(ve)-.25
G 2.5(dw).15 G(ith)-2.5 E F1(pr)2.5 E -.15(ev)-.18 G(ious-history).15 E
F0(or)2.5 E F1(next-history)2.5 E F0(.)A(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(42)190.395 E 0 Cg EP
%%Page: 43 43
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(history\255size \(unset\))108 84 Q F0 .949
(Set the maximum number of history entries sa)144 96 R -.15(ve)-.2 G
3.448(di).15 G 3.448(nt)-3.448 G .948(he history list.)-3.448 F .948
(If set to zero, an)5.948 F 3.448(ye)-.15 G(xisting)-3.598 E .482
(history entries are deleted and no ne)144 108 R 2.982(we)-.25 G .483
(ntries are sa)-2.982 F -.15(ve)-.2 G 2.983(d. If).15 F .483(set to a v)
2.983 F .483(alue less than zero, the num-)-.25 F .278
(ber of history entries is not limited.)144 120 R .277(By def)5.278 F
.277(ault, the number of history entries is set to the v)-.1 F .277
(alue of)-.25 F(the)144 132 Q F1(HISTSIZE)3.41 E F0 .91(shell v)3.41 F
3.41(ariable. If)-.25 F .911(an attempt is made to set)3.41 F/F2 10
/Times-Italic@0 SF(history\255size)3.411 E F0 .911(to a non-numeric v)
3.411 F(alue,)-.25 E
(the maximum number of history entries will be set to 500.)144 144 Q F1
(horizontal\255scr)108 156 Q(oll\255mode \(Off\))-.18 E F0 .449
(When set to)144 168 R F1(On)2.949 E F0 2.949(,m)C(ak)-2.949 E .448
(es readline use a single line for display)-.1 F 2.948(,s)-.65 G .448
(crolling the input horizontally on a)-2.948 F 1.194(single screen line\
 when it becomes longer than the screen width rather than wrapping to a\
 ne)144 180 R(w)-.25 E 2.5(line. This)144 192 R
(setting is automatically enabled for terminals of height 1.)2.5 E F1
(input\255meta \(Off\))108 204 Q F0 1.062(If set to)144 216 R F1(On)
3.562 E F0 3.562(,r)C 1.061(eadline will enable eight-bit input \(that \
is, it will not strip the eighth bit from the)-3.562 F .335
(characters it reads\), re)144 228 R -.05(ga)-.15 G .335
(rdless of what the terminal claims it can support.).05 F .336(The name)
5.336 F F1(meta\255\215ag)2.836 E F0(is)2.836 E 2.865(as)144 240 S(ynon)
-2.865 E .365(ym for this v)-.15 F 2.864(ariable. The)-.25 F(def)2.864 E
.364(ault is)-.1 F F2(Of)2.864 E(f)-.18 E F0 2.864(,b)C .364
(ut readline will set it to)-3.064 F F2(On)2.864 E F0 .364
(if the locale contains)2.864 F(eight-bit characters.)144 252 Q F1
(isear)108 264 Q(ch\255terminators \(`)-.18 E(`C\255[C\255J')-.63 E('\))
-.63 E F0 .439(The string of characters that should terminate an increm\
ental search without subsequently e)144 276 R -.15(xe)-.15 G(cut-).15 E
.935(ing the character as a command.)144 288 R .935(If this v)5.935 F
.935(ariable has not been gi)-.25 F -.15(ve)-.25 G 3.434(nav).15 G .934
(alue, the characters)-3.684 F F2(ESC)3.434 E F0(and)144 300 Q F2
(C\255J)2.5 E F0(will terminate an incremental search.)2.5 E F1 -.1(ke)
108 312 S(ymap \(emacs\)).1 E F0 2.02(Set the current readline k)144 324
R -.15(ey)-.1 G 4.521(map. The).15 F 2.021(set of v)4.521 F 2.021
(alid k)-.25 F -.15(ey)-.1 G 2.021(map names is).15 F F2 2.021
(emacs, emacs\255standar)4.521 F(d,)-.37 E .042
(emacs\255meta, emacs\255ctlx, vi, vi\255command)144 336 R F0 2.542(,a)C
(nd)-2.542 E F2(vi\255insert)2.832 E F0(.).68 E F2(vi)5.042 E F0 .042
(is equi)2.542 F -.25(va)-.25 G .042(lent to).25 F F2(vi\255command)
2.541 E F0(;)A F2(emacs)2.541 E F0 .448(is equi)144 348 R -.25(va)-.25 G
.448(lent to).25 F F2(emacs\255standar)2.948 E(d)-.37 E F0 5.448(.T)C
.448(he def)-5.448 F .448(ault v)-.1 F .449(alue is)-.25 F F2(emacs)
3.139 E F0 2.949(;t).27 G .449(he v)-2.949 F .449(alue of)-.25 F F1
(editing\255mode)2.949 E F0 .449(also af-)2.949 F(fects the def)144 360
Q(ault k)-.1 E -.15(ey)-.1 G(map.).15 E F1 -.1(ke)108 372 S
(yseq\255timeout \(500\)).1 E F0 .368(Speci\214es the duration)144 384 R
F2 -.37(re)2.867 G(adline).37 E F0 .367(will w)2.867 F .367
(ait for a character when reading an ambiguous k)-.1 F .667 -.15(ey s)
-.1 H(equence).15 E .524(\(one that can form a complete k)144 396 R .824
-.15(ey s)-.1 H .524(equence using the input read so f).15 F(ar)-.1 E
3.025(,o)-.4 G 3.025(rc)-3.025 G .525(an tak)-3.025 F 3.025(ea)-.1 G
.525(dditional in-)-3.025 F .807(put to complete a longer k)144 408 R
1.106 -.15(ey s)-.1 H 3.306(equence\). If).15 F .806(no input is recei)
3.306 F -.15(ve)-.25 G 3.306(dw).15 G .806(ithin the timeout,)-3.306 F
F2 -.37(re)3.306 G(adline).37 E F0(will)3.306 E .906(use the shorter b)
144 420 R .907(ut complete k)-.2 F 1.207 -.15(ey s)-.1 H 3.407
(equence. The).15 F -.25(va)3.407 G .907
(lue is speci\214ed in milliseconds, so a v).25 F .907(alue of)-.25 F
.05(1000 means that)144 432 R F2 -.37(re)2.55 G(adline).37 E F0 .05
(will w)2.55 F .05(ait one second for additional input.)-.1 F .05
(If this v)5.05 F .05(ariable is set to a v)-.25 F(alue)-.25 E .051
(less than or equal to zero, or to a non-numeric v)144 444 R(alue,)-.25
E F2 -.37(re)2.551 G(adline).37 E F0 .051(will w)2.551 F .051
(ait until another k)-.1 F .352 -.15(ey i)-.1 H 2.552(sp).15 G(ressed)
-2.552 E(to decide which k)144 456 Q .3 -.15(ey s)-.1 H
(equence to complete.).15 E F1(mark\255dir)108 468 Q(ectories \(On\))
-.18 E F0(If set to)144 480 Q F1(On)2.5 E F0 2.5(,c)C
(ompleted directory names ha)-2.5 E .3 -.15(ve a s)-.2 H(lash appended.)
.15 E F1(mark\255modi\214ed\255lines \(Off\))108 492 Q F0(If set to)144
504 Q F1(On)2.5 E F0 2.5(,h)C(istory lines that ha)-2.5 E .3 -.15(ve b)
-.2 H(een modi\214ed are displayed with a preceding asterisk \().15 E F1
(*)A F0(\).)A F1(mark\255symlink)108 516 Q(ed\255dir)-.1 E
(ectories \(Off\))-.18 E F0 .175(If set to)144 528 R F1(On)2.675 E F0
2.675(,c)C .175
(ompleted names which are symbolic links to directories ha)-2.675 F .475
-.15(ve a s)-.2 H .175(lash appended \(sub-).15 F(ject to the v)144 540
Q(alue of)-.25 E F1(mark\255dir)2.5 E(ectories)-.18 E F0(\).)A F1
(match\255hidden\255\214les \(On\))108 552 Q F0 .192(This v)144 564 R
.192(ariable, when set to)-.25 F F1(On)2.692 E F0 2.692(,c)C .192
(auses readline to match \214les whose names be)-2.692 F .193
(gin with a `.)-.15 F 2.693('\()-.7 G(hidden)-2.693 E .457
(\214les\) when performing \214lename completion.)144 576 R .456
(If set to)5.456 F F1(Off)2.956 E F0 2.956(,t)C .456(he leading `.)
-2.956 F 2.956('m)-.7 G .456(ust be supplied by the)-2.956 F
(user in the \214lename to be completed.)144 588 Q F1
(menu\255complete\255display\255pr)108 600 Q(e\214x \(Off\))-.18 E F0
1.585(If set to)144 612 R F1(On)4.085 E F0 4.085(,m)C 1.585(enu complet\
ion displays the common pre\214x of the list of possible completions)
-4.085 F(\(which may be empty\) before c)144 624 Q
(ycling through the list.)-.15 E F1(output\255meta \(Off\))108 636 Q F0
.507(If set to)144 648 R F1(On)3.007 E F0 3.007(,r)C .507(eadline will \
display characters with the eighth bit set directly rather than as a me\
ta-)-3.007 F(pre\214x)144 660 Q .884(ed escape sequence.)-.15 F .884
(The def)5.884 F .884(ault is)-.1 F F2(Of)3.384 E(f)-.18 E F0 3.384(,b)C
.884(ut readline will set it to)-3.584 F F2(On)3.384 E F0 .885
(if the locale contains)3.384 F(eight-bit characters.)144 672 Q F1
(page\255completions \(On\))108 684 Q F0 .809(If set to)144 696 R F1(On)
3.308 E F0 3.308(,r)C .808(eadline uses an internal)-3.308 F F2(mor)
3.308 E(e)-.37 E F0(-lik)A 3.308(ep)-.1 G .808
(ager to display a screenful of possible comple-)-3.308 F
(tions at a time.)144 708 Q(GNU Bash 5.1)72 768 Q(2020 October 29)
141.235 E(43)190.395 E 0 Cg EP
%%Page: 44 44
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(print\255completions\255horizontally \(Off\))108 84 Q F0 .227
(If set to)144 96 R F1(On)2.727 E F0 2.727(,r)C .227(eadline will displ\
ay completions with matches sorted horizontally in alphabetical or)
-2.727 F(-)-.2 E(der)144 108 Q 2.5(,r)-.4 G(ather than do)-2.5 E
(wn the screen.)-.25 E F1 -2.29 -.18(re v)108 120 T
(ert\255all\255at\255newline \(Off\)).08 E F0 .699(If set to)144 132 R
F1(On)3.199 E F0 3.199(,r)C .699
(eadline will undo all changes to history lines before returning when)
-3.199 F F1(accept\255line)3.198 E F0(is)3.198 E -.15(exe)144 144 S
2.686(cuted. By).15 F(def)2.686 E .186
(ault, history lines may be modi\214ed and retain indi)-.1 F .186
(vidual undo lists across calls to)-.25 F F1 -.18(re)144 156 S(adline)
.18 E F0(.)A F1(sho)108 168 Q(w\255all\255if\255ambiguous \(Off\))-.1 E
F0 .304(This alters the def)144 180 R .304(ault beha)-.1 F .304
(vior of the completion functions.)-.2 F .304(If set to)5.304 F F1(On)
2.804 E F0 2.803(,w)C .303(ords which ha)-2.903 F .603 -.15(ve m)-.2 H
(ore).15 E 1.264(than one possible completion cause the matches to be l\
isted immediately instead of ringing the)144 192 R(bell.)144 204 Q F1
(sho)108 216 Q(w\255all\255if\255unmodi\214ed \(Off\))-.1 E F0 5.346
(This alters the def)144 228 R 5.346(ault beha)-.1 F 5.345
(vior of the completion functions in a f)-.2 F 5.345(ashion similar to)
-.1 F F1(sho)144 240 Q(w\255all\255if\255ambiguous)-.1 E F0 6.69(.I)C
4.19(fs)-6.69 G 1.691(et to)-4.19 F F1(On)4.191 E F0 4.191(,w)C 1.691
(ords which ha)-4.291 F 1.991 -.15(ve m)-.2 H 1.691
(ore than one possible completion).15 F 1.04(without an)144 252 R 3.54
(yp)-.15 G 1.039
(ossible partial completion \(the possible completions don')-3.54 F
3.539(ts)-.18 G 1.039(hare a common pre\214x\))-3.539 F(cause the match\
es to be listed immediately instead of ringing the bell.)144 264 Q F1
(sho)108 276 Q(w\255mode\255in\255pr)-.1 E(ompt \(Off\))-.18 E F0 1.021
(If set to)144 288 R F1(On)3.521 E F0 3.521(,a)C 1.022
(dd a string to the be)-3.521 F 1.022
(ginning of the prompt indicating the editing mode: emacs, vi)-.15 F
(command, or vi insertion.)144 300 Q(The mode strings are user)5 E
(-settable \(e.g.,)-.2 E/F2 10/Times-Italic@0 SF
(emacs\255mode\255string)2.5 E F0(\).)A F1
(skip\255completed\255text \(Off\))108 312 Q F0 .095(If set to)144 324 R
F1(On)2.595 E F0 2.595(,t)C .095(his alters the def)-2.595 F .095
(ault completion beha)-.1 F .094
(vior when inserting a single match into the line.)-.2 F(It')144 336 Q
2.545(so)-.55 G .045(nly acti)-2.545 F .345 -.15(ve w)-.25 H .046
(hen performing completion in the middle of a w).15 F 2.546(ord. If)-.1
F .046(enabled, readline does not)2.546 F 1.394(insert characters from \
the completion that match characters after point in the w)144 348 R
1.394(ord being com-)-.1 F(pleted, so portions of the w)144 360 Q
(ord follo)-.1 E(wing the cursor are not duplicated.)-.25 E F1
(vi\255cmd\255mode\255string \(\(cmd\)\))108 372 Q F0 .517(If the)144
384 R F2(show\255mode\255in\255pr)3.017 E(ompt)-.45 E F0 -.25(va)3.017 G
.518(riable is enabled, this string is displayed immediately before the)
.25 F .475(last line of the primary prompt when vi editing mode is acti)
144 396 R .775 -.15(ve a)-.25 H .475(nd in command mode.).15 F .475
(The v)5.475 F(alue)-.25 E .33(is e)144 408 R .33(xpanded lik)-.15 F
2.83(eak)-.1 G .63 -.15(ey b)-2.93 H .33
(inding, so the standard set of meta- and control pre\214x).15 F .33
(es and backslash es-)-.15 F .245(cape sequences is a)144 420 R -.25(va)
-.2 G 2.745(ilable. Use).25 F .244(the \\1 and \\2 escapes to be)2.745 F
.244(gin and end sequences of non-printing)-.15 F(characters, which can\
 be used to embed a terminal control sequence into the mode string.)144
432 Q F1(vi\255ins\255mode\255string \(\(ins\)\))108 444 Q F0 .517
(If the)144 456 R F2(show\255mode\255in\255pr)3.017 E(ompt)-.45 E F0
-.25(va)3.017 G .518
(riable is enabled, this string is displayed immediately before the).25
F .186(last line of the primary prompt when vi editing mode is acti)144
468 R .486 -.15(ve a)-.25 H .186(nd in insertion mode.).15 F .186(The v)
5.186 F .186(alue is)-.25 F -.15(ex)144 480 S .923(panded lik).15 F
3.423(eak)-.1 G 1.223 -.15(ey b)-3.523 H .924
(inding, so the standard set of meta- and control pre\214x).15 F .924
(es and backslash es-)-.15 F .245(cape sequences is a)144 492 R -.25(va)
-.2 G 2.745(ilable. Use).25 F .244(the \\1 and \\2 escapes to be)2.745 F
.244(gin and end sequences of non-printing)-.15 F(characters, which can\
 be used to embed a terminal control sequence into the mode string.)144
504 Q F1(visible\255stats \(Off\))108 516 Q F0 .846(If set to)144 528 R
F1(On)3.346 E F0 3.346(,ac)C .846(haracter denoting a \214le')-3.346 F
3.346(st)-.55 G .846(ype as reported by)-3.346 F F2(stat)3.346 E F0 .846
(\(2\) is appended to the \214lename)B
(when listing possible completions.)144 540 Q F1
(Readline Conditional Constructs)87 556.8 Q F0 .05
(Readline implements a f)108 568.8 R .05(acility similar in spirit to t\
he conditional compilation features of the C preprocessor)-.1 F .096
(which allo)108 580.8 R .096(ws k)-.25 F .396 -.15(ey b)-.1 H .096
(indings and v).15 F .096
(ariable settings to be performed as the result of tests.)-.25 F .097
(There are four parser)5.096 F(directi)108 592.8 Q -.15(ve)-.25 G 2.5
(su).15 G(sed.)-2.5 E F1($if)108 609.6 Q F0(The)144 609.6 Q F1($if)2.963
E F0 .463(construct allo)2.963 F .462(ws bindings to be made based on t\
he editing mode, the terminal being used,)-.25 F
(or the application using readline.)144 621.6 Q(The te)5 E
(xt of the test, after an)-.15 E 2.5(yc)-.15 G(omparison operator)-2.5 E
(,)-.4 E -.15(ex)146.5 633.6 S(tends to the end of the line; unless oth\
erwise noted, no characters are required to isolate it.).15 E F1(mode)
144 650.4 Q F0(The)180 650.4 Q F1(mode=)3.711 E F0 1.211(form of the)
3.711 F F1($if)3.711 E F0(directi)3.711 E 1.511 -.15(ve i)-.25 H 3.711
(su).15 G 1.211(sed to test whether readline is in emacs or vi)-3.711 F
3.065(mode. This)180 662.4 R .565(may be used in conjunction with the)
3.065 F F1 .565(set k)3.065 F(eymap)-.1 E F0 .565
(command, for instance, to)3.065 F .735(set bindings in the)180 674.4 R
F2(emacs\255standar)3.235 E(d)-.37 E F0(and)3.235 E F2(emacs\255ctlx)
3.235 E F0 -.1(ke)3.235 G .735(ymaps only if readline is starting)-.05 F
(out in emacs mode.)180 686.4 Q F1(term)144 703.2 Q F0(The)180 703.2 Q
F1(term=)3.197 E F0 .696
(form may be used to include terminal-speci\214c k)3.197 F .996 -.15
(ey b)-.1 H .696(indings, perhaps to bind).15 F .654(the k)180 715.2 R
.954 -.15(ey s)-.1 H .654(equences output by the terminal').15 F 3.154
(sf)-.55 G .654(unction k)-3.154 F -.15(ey)-.1 G 3.154(s. The).15 F -.1
(wo)3.154 G .654(rd on the right side of).1 F(the)180 727.2 Q F1(=)3.232
E F0 .732(is tested ag)3.232 F .732(ainst both the full name of the ter\
minal and the portion of the terminal)-.05 F(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(44)190.395 E 0 Cg EP
%%Page: 45 45
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E
(name before the \214rst)180 84 Q/F1 10/Times-Bold@0 SF<ad>2.5 E F0 5
(.T)C(his allo)-5 E(ws)-.25 E/F2 10/Times-Italic@0 SF(sun)2.84 E F0
(to match both)2.74 E F2(sun)2.84 E F0(and)2.74 E F2(sun\255cmd)2.84 E
F0 2.5(,f).77 G(or instance.)-2.5 E F1 -.1(ve)144 100.8 S(rsion).1 E F0
(The)180 112.8 Q F1 -.1(ve)3.108 G(rsion).1 E F0 .608
(test may be used to perform comparisons ag)3.108 F .609
(ainst speci\214c readline v)-.05 F(ersions.)-.15 E(The)180 124.8 Q F1
-.1(ve)2.772 G(rsion).1 E F0 -.15(ex)2.772 G .272
(pands to the current readline v).15 F 2.771(ersion. The)-.15 F .271
(set of comparison operators in-)2.771 F(cludes)180 136.8 Q F1(=)3.063 E
F0 3.063(,\()C(and)-3.063 E F1(==)3.063 E F0(\),)A F1(!=)3.063 E F0(,)A
F1(<=)3.063 E F0(,)A F1(>=)3.063 E F0(,)A F1(<)3.063 E F0 3.063(,a)C(nd)
-3.063 E F1(>)3.064 E F0 5.564(.T)C .564(he v)-5.564 F .564
(ersion number supplied on the right side)-.15 F .318
(of the operator consists of a major v)180 148.8 R .318(ersion number)
-.15 F 2.818(,a)-.4 G 2.818(no)-2.818 G .318
(ptional decimal point, and an op-)-2.818 F .1(tional minor v)180 160.8
R .1(ersion \(e.g.,)-.15 F F1(7.1)2.6 E F0 .1(\). If the minor v)B .101
(ersion is omitted, it is assumed to be)-.15 F F1(0)2.601 E F0 5.101(.T)
C(he)-5.101 E .06(operator may be separated from the string)180 172.8 R
F1 -.1(ve)2.56 G(rsion).1 E F0 .06(and from the v)2.56 F .06
(ersion number ar)-.15 F(gument)-.18 E(by whitespace.)180 184.8 Q F1
(application)144 201.6 Q F0(The)180 213.6 Q F1(application)3.003 E F0
.503(construct is used to include application-speci\214c settings.)3.003
F .503(Each program)5.503 F .114(using the readline library sets the)180
225.6 R F2 .114(application name)2.614 F F0 2.614(,a)C .114
(nd an initialization \214le can test for a)-2.614 F .5(particular v)180
237.6 R 3(alue. This)-.25 F .501(could be used to bind k)3 F .801 -.15
(ey s)-.1 H .501(equences to functions useful for a spe-).15 F .397
(ci\214c program.)180 249.6 R -.15(Fo)5.397 G 2.896(ri).15 G .396
(nstance, the follo)-2.896 F .396(wing command adds a k)-.25 F .696 -.15
(ey s)-.1 H .396(equence that quotes the).15 F(current or pre)180 261.6
Q(vious w)-.25 E(ord in)-.1 E F1(bash)2.5 E F0(:)A F1($if)180 285.6 Q F0
(Bash)2.5 E 2.5(#Q)180 297.6 S(uote the current or pre)-2.5 E(vious w)
-.25 E(ord)-.1 E("\\C\255xq": "\\eb\\"\\ef\\"")180 309.6 Q F1($endif)180
321.6 Q F2(variable)144 338.4 Q F0(The)180 350.4 Q F2(variable)3.776 E
F0 1.276(construct pro)3.776 F 1.276
(vides simple equality tests for readline v)-.15 F 1.277(ariables and v)
-.25 F(alues.)-.25 E .08(The permitted comparison operators are)180
362.4 R F2(=)2.579 E F0(,)A F2(==)2.579 E F0 2.579(,a)C(nd)-2.579 E F2
(!=)2.579 E F0 5.079(.T)C .079(he v)-5.079 F .079
(ariable name must be sepa-)-.25 F .98(rated from the comparison operat\
or by whitespace; the operator may be separated from)180 374.4 R .13
(the v)180 386.4 R .13(alue on the right hand side by whitespace.)-.25 F
.129(Both string and boolean v)5.129 F .129(ariables may be)-.25 F
(tested. Boolean v)180 398.4 Q(ariables must be tested ag)-.25 E
(ainst the v)-.05 E(alues)-.25 E F2(on)2.5 E F0(and)2.5 E F2(of)2.5 E(f)
-.18 E F0(.)A F1($endif)108 415.2 Q F0(This command, as seen in the pre)
144 415.2 Q(vious e)-.25 E(xample, terminates an)-.15 E F1($if)2.5 E F0
(command.)2.5 E F1($else)108 432 Q F0(Commands in this branch of the)144
432 Q F1($if)2.5 E F0(directi)2.5 E .3 -.15(ve a)-.25 H(re e).15 E -.15
(xe)-.15 G(cuted if the test f).15 E(ails.)-.1 E F1($include)108 448.8 Q
F0 .356(This directi)144 460.8 R .656 -.15(ve t)-.25 H(ak).15 E .356
(es a single \214lename as an ar)-.1 F .357
(gument and reads commands and bindings from that)-.18 F 2.5(\214le. F)
144 472.8 R(or e)-.15 E(xample, the follo)-.15 E(wing directi)-.25 E .3
-.15(ve w)-.25 H(ould read).05 E F2(/etc/inputr)2.5 E(c)-.37 E F0(:)A F1
($include)144 496.8 Q F2(/etc/inputr)5.833 E(c)-.37 E F1(Sear)87 513.6 Q
(ching)-.18 E F0 .835(Readline pro)108 525.6 R .835
(vides commands for searching through the command history \(see)-.15 F
/F3 9/Times-Bold@0 SF(HIST)3.334 E(OR)-.162 E(Y)-.315 E F0(belo)3.084 E
.834(w\) for lines)-.25 F(containing a speci\214ed string.)108 537.6 Q
(There are tw)5 E 2.5(os)-.1 G(earch modes:)-2.5 E F2(incr)2.51 E
(emental)-.37 E F0(and)3.01 E F2(non-incr)2.86 E(emental)-.37 E F0(.).51
E .697(Incremental searches be)108 554.4 R .697
(gin before the user has \214nished typing the search string.)-.15 F
.698(As each character of the)5.698 F .113
(search string is typed, readline displays the ne)108 566.4 R .112
(xt entry from the history matching the string typed so f)-.15 F(ar)-.1
E 5.112(.A)-.55 G(n)-5.112 E .542
(incremental search requires only as man)108 578.4 R 3.042(yc)-.15 G
.542(haracters as needed to \214nd the desired history entry)-3.042 F
5.542(.T)-.65 G .542(he char)-5.542 F(-)-.2 E .224
(acters present in the v)108 590.4 R .224(alue of the)-.25 F F1(isear)
2.724 E(ch-terminators)-.18 E F0 -.25(va)2.724 G .224
(riable are used to terminate an incremental search.).25 F .66
(If that v)108 602.4 R .66(ariable has not been assigned a v)-.25 F .66
(alue the Escape and Control-J characters will terminate an incre-)-.25
F .097(mental search.)108 614.4 R .096(Control-G will abort an incremen\
tal search and restore the original line.)5.097 F .096
(When the search is)5.096 F(terminated, the history entry containing th\
e search string becomes the current line.)108 626.4 Q 2.938 -.8(To \214)
108 643.2 T 1.339(nd other matching entries in the history list, type C\
ontrol-S or Control-R as appropriate.).8 F 1.339(This will)6.339 F .675
(search backw)108 655.2 R .675(ard or forw)-.1 F .675
(ard in the history for the ne)-.1 F .674
(xt entry matching the search string typed so f)-.15 F(ar)-.1 E 5.674
(.A)-.55 G -.15(ny)-5.674 G .174(other k)108 667.2 R .474 -.15(ey s)-.1
H .174
(equence bound to a readline command will terminate the search and e).15
F -.15(xe)-.15 G .175(cute that command.).15 F -.15(Fo)5.175 G(r).15 E
.541(instance, a)108 679.2 R F2(ne)3.041 E(wline)-.15 E F0 .541
(will terminate the search and accept the line, thereby e)3.041 F -.15
(xe)-.15 G .54(cuting the command from the).15 F(history list.)108 691.2
Q .653(Readline remembers the last incremental search string.)108 708 R
.653(If tw)5.653 F 3.153(oC)-.1 G .653(ontrol-Rs are typed without an)
-3.153 F 3.153(yi)-.15 G(nterv)-3.153 E(en-)-.15 E
(ing characters de\214ning a ne)108 720 Q 2.5(ws)-.25 G
(earch string, an)-2.5 E 2.5(yr)-.15 G(emembered search string is used.)
-2.5 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(45)190.395 E 0 Cg
EP
%%Page: 46 46
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .567(Non-incremen\
tal searches read the entire search string before starting to search fo\
r matching history lines.)108 84 R(The search string may be typed by th\
e user or be part of the contents of the current line.)108 96 Q/F1 10
/Times-Bold@0 SF(Readline Command Names)87 112.8 Q F0 1.391(The follo)
108 124.8 R 1.391
(wing is a list of the names of the commands and the def)-.25 F 1.391
(ault k)-.1 F 1.691 -.15(ey s)-.1 H 1.391(equences to which the).15 F
3.892(ya)-.15 G(re)-3.892 E 2.622(bound. Command)108 136.8 R .122
(names without an accompan)2.622 F .122(ying k)-.15 F .421 -.15(ey s)-.1
H .121(equence are unbound by def).15 F 2.621(ault. In)-.1 F .121
(the follo)2.621 F(wing)-.25 E(descriptions,)108 148.8 Q/F2 10
/Times-Italic@0 SF(point)3.41 E F0 .91
(refers to the current cursor position, and)3.41 F F2(mark)3.411 E F0
.911(refers to a cursor position sa)3.411 F -.15(ve)-.2 G 3.411(db).15 G
3.411(yt)-3.411 G(he)-3.411 E F1(set\255mark)108 160.8 Q F0 2.5
(command. The)2.5 F(te)2.5 E
(xt between the point and mark is referred to as the)-.15 E F2 -.37(re)
2.5 G(gion)-.03 E F0(.)A F1(Commands f)87 177.6 Q(or Mo)-.25 E(ving)-.1
E(beginning\255of\255line \(C\255a\))108 189.6 Q F0(Mo)144 201.6 Q .3
-.15(ve t)-.15 H 2.5(ot).15 G(he start of the current line.)-2.5 E F1
(end\255of\255line \(C\255e\))108 213.6 Q F0(Mo)144 225.6 Q .3 -.15
(ve t)-.15 H 2.5(ot).15 G(he end of the line.)-2.5 E F1 -.25(fo)108
237.6 S(rward\255char \(C\255f\)).25 E F0(Mo)144 249.6 Q .3 -.15(ve f)
-.15 H(orw).15 E(ard a character)-.1 E(.)-.55 E F1
(backward\255char \(C\255b\))108 261.6 Q F0(Mo)144 273.6 Q .3 -.15(ve b)
-.15 H(ack a character).15 E(.)-.55 E F1 -.25(fo)108 285.6 S(rward\255w)
.25 E(ord \(M\255f\))-.1 E F0(Mo)144 297.6 Q .823 -.15(ve f)-.15 H(orw)
.15 E .523(ard to the end of the ne)-.1 F .523(xt w)-.15 F 3.023(ord. W)
-.1 F .522(ords are composed of alphanumeric characters \(let-)-.8 F
(ters and digits\).)144 309.6 Q F1(backward\255w)108 321.6 Q
(ord \(M\255b\))-.1 E F0(Mo)144 333.6 Q 1.71 -.15(ve b)-.15 H 1.41
(ack to the start of the current or pre).15 F 1.41(vious w)-.25 F 3.91
(ord. W)-.1 F 1.41(ords are composed of alphanumeric)-.8 F
(characters \(letters and digits\).)144 345.6 Q F1(shell\255f)108 357.6
Q(orward\255w)-.25 E(ord)-.1 E F0(Mo)144 369.6 Q .784 -.15(ve f)-.15 H
(orw).15 E .484(ard to the end of the ne)-.1 F .484(xt w)-.15 F 2.984
(ord. W)-.1 F .484(ords are delimited by non-quoted shell metacharac-)
-.8 F(ters.)144 381.6 Q F1(shell\255backward\255w)108 393.6 Q(ord)-.1 E
F0(Mo)144 405.6 Q .908 -.15(ve b)-.15 H .609
(ack to the start of the current or pre).15 F .609(vious w)-.25 F 3.109
(ord. W)-.1 F .609(ords are delimited by non-quoted shell)-.8 F
(metacharacters.)144 417.6 Q F1(pr)108 429.6 Q -.15(ev)-.18 G
(ious\255scr).15 E(een\255line)-.18 E F0 .891(Attempt to mo)144 441.6 R
1.191 -.15(ve p)-.15 H .891(oint to the same ph).15 F .891
(ysical screen column on the pre)-.05 F .89(vious ph)-.25 F .89
(ysical screen line.)-.05 F .87(This will not ha)144 453.6 R 1.17 -.15
(ve t)-.2 H .87(he desired ef).15 F .87
(fect if the current Readline line does not tak)-.25 F 3.37(eu)-.1 G
3.37(pm)-3.37 G .87(ore than one)-3.37 F(ph)144 465.6 Q(ysical line or \
if point is not greater than the length of the prompt plus the screen w\
idth.)-.05 E F1(next\255scr)108 477.6 Q(een\255line)-.18 E F0 .638
(Attempt to mo)144 489.6 R .938 -.15(ve p)-.15 H .638
(oint to the same ph).15 F .637(ysical screen column on the ne)-.05 F
.637(xt ph)-.15 F .637(ysical screen line. This)-.05 F .008(will not ha)
144 501.6 R .309 -.15(ve t)-.2 H .009(he desired ef).15 F .009
(fect if the current Readline line does not tak)-.25 F 2.509(eu)-.1 G
2.509(pm)-2.509 G .009(ore than one ph)-2.509 F(ysical)-.05 E .772(line\
 or if the length of the current Readline line is not greater than the \
length of the prompt plus)144 513.6 R(the screen width.)144 525.6 Q F1
(clear\255display \(M\255C\255l\))108 537.6 Q F0 1.498
(Clear the screen and, if possible, the terminal')144 549.6 R 3.999(ss)
-.55 G 1.499(crollback b)-3.999 F(uf)-.2 E(fer)-.25 E 3.999(,t)-.4 G
1.499(hen redra)-3.999 F 3.999(wt)-.15 G 1.499(he current line,)-3.999 F
(lea)144 561.6 Q(ving the current line at the top of the screen.)-.2 E
F1(clear\255scr)108 573.6 Q(een \(C\255l\))-.18 E F0 1.36
(Clear the screen, then redra)144 585.6 R 3.86(wt)-.15 G 1.36
(he current line, lea)-3.86 F 1.36
(ving the current line at the top of the screen.)-.2 F -.4(Wi)144 597.6
S(th an ar).4 E
(gument, refresh the current line without clearing the screen.)-.18 E F1
-.18(re)108 609.6 S(draw\255curr).18 E(ent\255line)-.18 E F0
(Refresh the current line.)144 621.6 Q F1(Commands f)87 638.4 Q
(or Manipulating the History)-.25 E(accept\255line \(Newline, Retur)108
650.4 Q(n\))-.15 E F0 .158(Accept the line re)144 662.4 R -.05(ga)-.15 G
.158(rdless of where the cursor is.).05 F .158
(If this line is non-empty)5.158 F 2.659(,a)-.65 G .159
(dd it to the history list)-2.659 F .699(according to the state of the)
144 674.4 R/F3 9/Times-Bold@0 SF(HISTCONTR)3.199 E(OL)-.27 E F0 -.25(va)
2.949 G 3.199(riable. If).25 F .699
(the line is a modi\214ed history line, then)3.199 F
(restore the history line to its original state.)144 686.4 Q F1(pr)108
698.4 Q -.15(ev)-.18 G(ious\255history \(C\255p\)).15 E F0
(Fetch the pre)144 710.4 Q(vious command from the history list, mo)-.25
E(ving back in the list.)-.15 E(GNU Bash 5.1)72 768 Q(2020 October 29)
141.235 E(46)190.395 E 0 Cg EP
%%Page: 47 47
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(next\255history \(C\255n\))108 84 Q F0(Fetch the ne)144 96 Q
(xt command from the history list, mo)-.15 E(ving forw)-.15 E
(ard in the list.)-.1 E F1(beginning\255of\255history \(M\255<\))108 108
Q F0(Mo)144 120 Q .3 -.15(ve t)-.15 H 2.5(ot).15 G
(he \214rst line in the history)-2.5 E(.)-.65 E F1
(end\255of\255history \(M\255>\))108 132 Q F0(Mo)144 144 Q .3 -.15(ve t)
-.15 H 2.5(ot).15 G(he end of the input history)-2.5 E 2.5(,i)-.65 G
(.e., the line currently being entered.)-2.5 E F1 -2.29 -.18(re v)108
156 T(erse\255sear).08 E(ch\255history \(C\255r\))-.18 E F0 1.47
(Search backw)144 168 R 1.471(ard starting at the current line and mo)
-.1 F 1.471(ving `up' through the history as necessary)-.15 F(.)-.65 E
(This is an incremental search.)144 180 Q F1 -.25(fo)108 192 S
(rward\255sear).25 E(ch\255history \(C\255s\))-.18 E F0 1.132
(Search forw)144 204 R 1.132(ard starting at the current line and mo)-.1
F 1.131(ving `do)-.15 F 1.131(wn' through the history as necessary)-.25
F(.)-.65 E(This is an incremental search.)144 216 Q F1(non\255incr)108
228 Q(emental\255r)-.18 E -2.3 -.15(ev e)-.18 H(rse\255sear).15 E
(ch\255history \(M\255p\))-.18 E F0 .164(Search backw)144 240 R .164(ar\
d through the history starting at the current line using a non-incremen\
tal search for)-.1 F 2.5(as)144 252 S(tring supplied by the user)-2.5 E
(.)-.55 E F1(non\255incr)108 264 Q(emental\255f)-.18 E(orward\255sear)
-.25 E(ch\255history \(M\255n\))-.18 E F0 1.354(Search forw)144 276 R
1.354(ard through the history using a non-incremental search for a stri\
ng supplied by the)-.1 F(user)144 288 Q(.)-.55 E F1(history\255sear)108
300 Q(ch\255f)-.18 E(orward)-.25 E F0 .248(Search forw)144 312 R .249(a\
rd through the history for the string of characters between the start o\
f the current line)-.1 F(and the point.)144 324 Q
(This is a non-incremental search.)5 E F1(history\255sear)108 336 Q
(ch\255backward)-.18 E F0 .951(Search backw)144 348 R .951(ard through \
the history for the string of characters between the start of the curre\
nt)-.1 F(line and the point.)144 360 Q
(This is a non-incremental search.)5 E F1(history\255substring\255sear)
108 372 Q(ch\255backward)-.18 E F0 .95(Search backw)144 384 R .951(ard \
through the history for the string of characters between the start of t\
he current)-.1 F .007(line and the current cursor position \(the)144 396
R/F2 10/Times-Italic@0 SF(point)2.507 E F0 2.507(\). The)B .007
(search string may match an)2.507 F .006(ywhere in a history)-.15 F 2.5
(line. This)144 408 R(is a non-incremental search.)2.5 E F1
(history\255substring\255sear)108 420 Q(ch\255f)-.18 E(orward)-.25 E F0
.248(Search forw)144 432 R .249(ard through the history for the string \
of characters between the start of the current line)-.1 F .319
(and the point.)144 444 R .319(The search string may match an)5.319 F
.319(ywhere in a history line.)-.15 F .318(This is a non-incremental)
5.318 F(search.)144 456 Q F1(yank\255nth\255ar)108 468 Q 2.5(g\()-.1 G
<4dad43ad7929>-2.5 E F0 .622(Insert the \214rst ar)144 480 R .622
(gument to the pre)-.18 F .622(vious command \(usually the second w)-.25
F .622(ord on the pre)-.1 F .622(vious line\))-.25 F .773(at point.)144
492 R -.4(Wi)5.773 G .773(th an ar).4 F(gument)-.18 E F2(n)3.633 E F0
3.273(,i).24 G .773(nsert the)-3.273 F F2(n)3.273 E F0 .773(th w)B .773
(ord from the pre)-.1 F .773(vious command \(the w)-.25 F .773
(ords in the)-.1 F(pre)144 504 Q .291(vious command be)-.25 F .291
(gin with w)-.15 F .291(ord 0\).)-.1 F 2.791(An)5.291 G -2.25 -.15(eg a)
-2.791 H(ti).15 E .591 -.15(ve a)-.25 H -.18(rg).15 G .291
(ument inserts the).18 F F2(n)2.791 E F0 .291(th w)B .292
(ord from the end of)-.1 F .282(the pre)144 516 R .282(vious command.)
-.25 F .282(Once the ar)5.282 F(gument)-.18 E F2(n)2.781 E F0 .281
(is computed, the ar)2.781 F .281(gument is e)-.18 F .281
(xtracted as if the "!)-.15 F F2(n)A F0(")A(history e)144 528 Q
(xpansion had been speci\214ed.)-.15 E F1(yank\255last\255ar)108 540 Q
2.5(g\()-.1 G -1.667(M\255. ,)-2.5 F -1.667(M\255_ \))2.5 F F0 1.307
(Insert the last ar)144 552 R 1.307(gument to the pre)-.18 F 1.307
(vious command \(the last w)-.25 F 1.308(ord of the pre)-.1 F 1.308
(vious history entry\).)-.25 F -.4(Wi)144 564 S .204(th a numeric ar).4
F .204(gument, beha)-.18 F .504 -.15(ve ex)-.2 H .204(actly lik).15 F(e)
-.1 E F1(yank\255nth\255ar)2.704 E(g)-.1 E F0 5.203(.S)C(uccessi)-5.203
E .503 -.15(ve c)-.25 H .203(alls to).15 F F1(yank\255last\255ar)2.703 E
(g)-.1 E F0(mo)144 576 Q .806 -.15(ve b)-.15 H .507
(ack through the history list, inserting the last w).15 F .507
(ord \(or the w)-.1 F .507(ord speci\214ed by the ar)-.1 F(gument)-.18 E
.416(to the \214rst call\) of each line in turn.)144 588 R(An)5.416 E
2.916(yn)-.15 G .416(umeric ar)-2.916 F .416
(gument supplied to these successi)-.18 F .715 -.15(ve c)-.25 H .415
(alls de-).15 F 1.217(termines the direction to mo)144 600 R 1.518 -.15
(ve t)-.15 H 1.218(hrough the history).15 F 6.218(.A)-.65 G(ne)-2.5 E
-.05(ga)-.15 G(ti).05 E 1.518 -.15(ve a)-.25 H -.18(rg).15 G 1.218
(ument switches the direction).18 F .494
(through the history \(back or forw)144 612 R 2.994(ard\). The)-.1 F
.494(history e)2.994 F .494(xpansion f)-.15 F .494
(acilities are used to e)-.1 F .494(xtract the last)-.15 F -.1(wo)144
624 S(rd, as if the "!$" history e).1 E(xpansion had been speci\214ed.)
-.15 E F1(shell\255expand\255line \(M\255C\255e\))108 636 Q F0 .622
(Expand the line as the shell does.)144 648 R .622
(This performs alias and history e)5.622 F .623
(xpansion as well as all of the)-.15 F(shell w)144 660 Q(ord e)-.1 E 2.5
(xpansions. See)-.15 F/F3 9/Times-Bold@0 SF(HIST)2.5 E(OR)-.162 E 2.25
(YE)-.315 G(XP)-2.25 E(ANSION)-.666 E F0(belo)2.25 E 2.5(wf)-.25 G
(or a description of history e)-2.5 E(xpansion.)-.15 E F1
(history\255expand\255line \(M\255^\))108 672 Q F0 .939
(Perform history e)144 684 R .939(xpansion on the current line.)-.15 F
(See)5.939 E F3(HIST)3.439 E(OR)-.162 E 3.189(YE)-.315 G(XP)-3.189 E
(ANSION)-.666 E F0(belo)3.189 E 3.438(wf)-.25 G .938(or a descrip-)
-3.438 F(tion of history e)144 696 Q(xpansion.)-.15 E(GNU Bash 5.1)72
768 Q(2020 October 29)141.235 E(47)190.395 E 0 Cg EP
%%Page: 48 48
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(magic\255space)108 84 Q F0 .437(Perform history e)144 96 R .437
(xpansion on the current line and insert a space.)-.15 F(See)5.438 E/F2
9/Times-Bold@0 SF(HIST)2.938 E(OR)-.162 E 2.688(YE)-.315 G(XP)-2.688 E
(ANSION)-.666 E F0(be-)2.688 E(lo)144 108 Q 2.5(wf)-.25 G
(or a description of history e)-2.5 E(xpansion.)-.15 E F1
(alias\255expand\255line)108 120 Q F0 .395(Perform alias e)144 132 R
.395(xpansion on the current line.)-.15 F(See)5.395 E F2(ALIASES)2.895 E
F0(abo)2.645 E .694 -.15(ve f)-.15 H .394(or a description of alias e)
.15 F(xpan-)-.15 E(sion.)144 144 Q F1
(history\255and\255alias\255expand\255line)108 156 Q F0
(Perform history and alias e)144 168 Q(xpansion on the current line.)
-.15 E F1(insert\255last\255ar)108 180 Q(gument \(M\255.)-.1 E 2.5(,M)
.833 G -1.667(\255_ \))-2.5 F F0 2.5(As)144 192 S(ynon)-2.5 E(ym for)
-.15 E F1(yank\255last\255ar)2.5 E(g)-.1 E F0(.)A F1
(operate\255and\255get\255next \(C\255o\))108 204 Q F0 .947
(Accept the current line for e)144 216 R -.15(xe)-.15 G .948
(cution and fetch the ne).15 F .948(xt line relati)-.15 F 1.248 -.15
(ve t)-.25 H 3.448(ot).15 G .948(he current line from the)-3.448 F .73
(history for editing.)144 228 R 3.23(An)5.73 G .73(umeric ar)-3.23 F
.729
(gument, if supplied, speci\214es the history entry to use instead of)
-.18 F(the current line.)144 240 Q F1
(edit\255and\255execute\255command \(C\255x C\255e\))108 252 Q F0(In)144
264 Q -.2(vo)-.4 G .346 -.1(ke a).2 H 2.646(ne).1 G .146
(ditor on the current command line, and e)-2.646 F -.15(xe)-.15 G .146
(cute the result as shell commands.).15 F F1(Bash)5.147 E F0(at-)2.647 E
(tempts to in)144 276 Q -.2(vo)-.4 G -.1(ke).2 G F2($VISU)2.6 E(AL)-.54
E/F3 9/Times-Roman@0 SF(,)A F2($EDIT)2.25 E(OR)-.162 E F3(,)A F0(and)
2.25 E/F4 10/Times-Italic@0 SF(emacs)2.5 E F0(as the editor)2.5 E 2.5
(,i)-.4 G 2.5(nt)-2.5 G(hat order)-2.5 E(.)-.55 E F1(Commands f)87 292.8
Q(or Changing T)-.25 E(ext)-.92 E F4(end\255of\255\214le)108 304.8 Q F1
(\(usually C\255d\))2.5 E F0 .799
(The character indicating end-of-\214le as set, for e)144 316.8 R .799
(xample, by)-.15 F/F5 10/Courier@0 SF(stty)3.299 E F0 5.799(.I)C 3.298
(ft)-5.799 G .798(his character is read when)-3.298 F .592
(there are no characters on the line, and point is at the be)144 328.8 R
.593(ginning of the line, Readline interprets it)-.15 F
(as the end of input and returns)144 340.8 Q F2(EOF)2.5 E F3(.)A F1
(delete\255char \(C\255d\))108 352.8 Q F0 .442
(Delete the character at point.)144 364.8 R .442
(If this function is bound to the same character as the tty)5.442 F F1
(EOF)2.941 E F0(char)2.941 E(-)-.2 E(acter)144 376.8 Q 2.5(,a)-.4 G(s)
-2.5 E F1(C\255d)2.5 E F0(commonly is, see abo)2.5 E .3 -.15(ve f)-.15 H
(or the ef).15 E(fects.)-.25 E F1(backward\255delete\255char \(Rubout\))
108 388.8 Q F0 .552(Delete the character behind the cursor)144 400.8 R
5.553(.W)-.55 G .553(hen gi)-5.553 F -.15(ve)-.25 G 3.053(nan).15 G .553
(umeric ar)-3.053 F .553(gument, sa)-.18 F .853 -.15(ve t)-.2 H .553
(he deleted te).15 F .553(xt on)-.15 F(the kill ring.)144 412.8 Q F1
-.25(fo)108 424.8 S(rward\255backward\255delete\255char).25 E F0 .474
(Delete the character under the cursor)144 436.8 R 2.974(,u)-.4 G .474
(nless the cursor is at the end of the line, in which case the)-2.974 F
(character behind the cursor is deleted.)144 448.8 Q F1
(quoted\255insert \(C\255q, C\255v\))108 460.8 Q F0 .778(Add the ne)144
472.8 R .779(xt character typed to the line v)-.15 F 3.279
(erbatim. This)-.15 F .779(is ho)3.279 F 3.279(wt)-.25 G 3.279(oi)-3.279
G .779(nsert characters lik)-3.279 F(e)-.1 E F1(C\255q)3.279 E F0 3.279
(,f)C(or)-3.279 E -.15(ex)144 484.8 S(ample.).15 E F1
(tab\255insert \(C\255v T)108 496.8 Q(AB\))-.9 E F0
(Insert a tab character)144 508.8 Q(.)-.55 E F1
(self\255insert \(a, b, A, 1, !, ...\))108 520.8 Q F0
(Insert the character typed.)144 532.8 Q F1
(transpose\255chars \(C\255t\))108 544.8 Q F0 .322
(Drag the character before point forw)144 556.8 R .321(ard o)-.1 F -.15
(ve)-.15 G 2.821(rt).15 G .321(he character at point, mo)-2.821 F .321
(ving point forw)-.15 F .321(ard as well.)-.1 F .372
(If point is at the end of the line, then this transposes the tw)144
568.8 R 2.872(oc)-.1 G .373(haracters before point.)-2.872 F(Ne)5.373 E
-.05(ga)-.15 G(ti).05 E .673 -.15(ve a)-.25 H -.2(r-).15 G(guments ha)
144 580.8 Q .3 -.15(ve n)-.2 H 2.5(oe).15 G -.25(ff)-2.5 G(ect.).25 E F1
(transpose\255w)108 592.8 Q(ords \(M\255t\))-.1 E F0 .024(Drag the w)144
604.8 R .024(ord before point past the w)-.1 F .023(ord after point, mo)
-.1 F .023(ving point o)-.15 F -.15(ve)-.15 G 2.523(rt).15 G .023(hat w)
-2.523 F .023(ord as well.)-.1 F .023(If point)5.023 F
(is at the end of the line, this transposes the last tw)144 616.8 Q 2.5
(ow)-.1 G(ords on the line.)-2.6 E F1(upcase\255w)108 628.8 Q
(ord \(M\255u\))-.1 E F0 1.698(Uppercase the current \(or follo)144
640.8 R 1.698(wing\) w)-.25 F 4.198(ord. W)-.1 F 1.698(ith a ne)-.4 F
-.05(ga)-.15 G(ti).05 E 1.999 -.15(ve a)-.25 H -.18(rg).15 G 1.699
(ument, uppercase the pre).18 F(vious)-.25 E -.1(wo)144 652.8 S(rd, b).1
E(ut do not mo)-.2 E .3 -.15(ve p)-.15 H(oint.).15 E F1(do)108 664.8 Q
(wncase\255w)-.1 E(ord \(M\255l\))-.1 E F0(Lo)144 676.8 Q 1.648
(wercase the current \(or follo)-.25 F 1.648(wing\) w)-.25 F 4.148
(ord. W)-.1 F 1.647(ith a ne)-.4 F -.05(ga)-.15 G(ti).05 E 1.947 -.15
(ve a)-.25 H -.18(rg).15 G 1.647(ument, lo).18 F 1.647(wercase the pre)
-.25 F(vious)-.25 E -.1(wo)144 688.8 S(rd, b).1 E(ut do not mo)-.2 E .3
-.15(ve p)-.15 H(oint.).15 E F1(capitalize\255w)108 700.8 Q
(ord \(M\255c\))-.1 E F0 1.974(Capitalize the current \(or follo)144
712.8 R 1.974(wing\) w)-.25 F 4.474(ord. W)-.1 F 1.974(ith a ne)-.4 F
-.05(ga)-.15 G(ti).05 E 2.274 -.15(ve a)-.25 H -.18(rg).15 G 1.975
(ument, capitalize the pre).18 F(vious)-.25 E -.1(wo)144 724.8 S(rd, b)
.1 E(ut do not mo)-.2 E .3 -.15(ve p)-.15 H(oint.).15 E(GNU Bash 5.1)72
768 Q(2020 October 29)141.235 E(48)190.395 E 0 Cg EP
%%Page: 49 49
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF -.1(ove)108 84 S(rwrite\255mode).1 E F0 -.8(To)144 96 S .438(ggle o)
.8 F -.15(ve)-.15 G .438(rwrite mode.).15 F -.4(Wi)5.438 G .438(th an e)
.4 F .438(xplicit positi)-.15 F .737 -.15(ve n)-.25 H .437(umeric ar).15
F .437(gument, switches to o)-.18 F -.15(ve)-.15 G .437(rwrite mode.).15
F -.4(Wi)144 108 S .78(th an e).4 F .781(xplicit non-positi)-.15 F 1.081
-.15(ve n)-.25 H .781(umeric ar).15 F .781
(gument, switches to insert mode.)-.18 F .781(This command af)5.781 F
(fects)-.25 E(only)144 120 Q F1(emacs)4.395 E F0(mode;)4.395 E F1(vi)
4.395 E F0 1.894(mode does o)4.395 F -.15(ve)-.15 G 1.894(rwrite dif).15
F(ferently)-.25 E 6.894(.E)-.65 G 1.894(ach call to)-6.894 F/F2 10
/Times-Italic@0 SF -.37(re)4.394 G(adline\(\)).37 E F0 1.894
(starts in insert)4.394 F 3.968(mode. In)144 132 R -.15(ove)3.968 G
1.468(rwrite mode, characters bound to).15 F F1(self\255insert)3.969 E
F0 1.469(replace the te)3.969 F 1.469(xt at point rather than)-.15 F
.958(pushing the te)144 144 R .958(xt to the right.)-.15 F .957
(Characters bound to)5.958 F F1(backward\255delete\255char)3.457 E F0
.957(replace the character)3.457 F(before point with a space.)144 156 Q
(By def)5 E(ault, this command is unbound.)-.1 E F1(Killing and Y)87
172.8 Q(anking)-.85 E(kill\255line \(C\255k\))108 184.8 Q F0
(Kill the te)144 196.8 Q(xt from point to the end of the line.)-.15 E F1
(backward\255kill\255line \(C\255x Rubout\))108 208.8 Q F0(Kill backw)
144 220.8 Q(ard to the be)-.1 E(ginning of the line.)-.15 E F1
(unix\255line\255discard \(C\255u\))108 232.8 Q F0(Kill backw)144 244.8
Q(ard from point to the be)-.1 E(ginning of the line.)-.15 E
(The killed te)5 E(xt is sa)-.15 E -.15(ve)-.2 G 2.5(do).15 G 2.5(nt)
-2.5 G(he kill-ring.)-2.5 E F1(kill\255whole\255line)108 256.8 Q F0
(Kill all characters on the current line, no matter where point is.)144
268.8 Q F1(kill\255w)108 280.8 Q(ord \(M\255d\))-.1 E F0 .728
(Kill from point to the end of the current w)144 292.8 R .729
(ord, or if between w)-.1 F .729(ords, to the end of the ne)-.1 F .729
(xt w)-.15 F(ord.)-.1 E -.8(Wo)144 304.8 S
(rd boundaries are the same as those used by).8 E F1 -.25(fo)2.5 G
(rward\255w).25 E(ord)-.1 E F0(.)A F1(backward\255kill\255w)108 316.8 Q
(ord \(M\255Rubout\))-.1 E F0(Kill the w)144 328.8 Q(ord behind point.)
-.1 E -.8(Wo)5 G(rd boundaries are the same as those used by).8 E F1
(backward\255w)2.5 E(ord)-.1 E F0(.)A F1(shell\255kill\255w)108 340.8 Q
(ord)-.1 E F0 .729(Kill from point to the end of the current w)144 352.8
R .728(ord, or if between w)-.1 F .728(ords, to the end of the ne)-.1 F
.728(xt w)-.15 F(ord.)-.1 E -.8(Wo)144 364.8 S
(rd boundaries are the same as those used by).8 E F1(shell\255f)2.5 E
(orward\255w)-.25 E(ord)-.1 E F0(.)A F1(shell\255backward\255kill\255w)
108 376.8 Q(ord)-.1 E F0 3.025(Kill the w)144 388.8 R 3.025
(ord behind point.)-.1 F -.8(Wo)8.025 G 3.025
(rd boundaries are the same as those used by).8 F F1(shell\255back-)
5.525 E(ward\255w)144 400.8 Q(ord)-.1 E F0(.)A F1(unix\255w)108 412.8 Q
(ord\255rubout \(C\255w\))-.1 E F0 .365(Kill the w)144 424.8 R .365
(ord behind point, using white space as a w)-.1 F .364(ord boundary)-.1
F 5.364(.T)-.65 G .364(he killed te)-5.364 F .364(xt is sa)-.15 F -.15
(ve)-.2 G 2.864(do).15 G 2.864(nt)-2.864 G(he)-2.864 E(kill-ring.)144
436.8 Q F1(unix\255\214lename\255rubout)108 448.8 Q F0 .166(Kill the w)
144 460.8 R .166
(ord behind point, using white space and the slash character as the w)
-.1 F .167(ord boundaries.)-.1 F(The)5.167 E(killed te)144 472.8 Q
(xt is sa)-.15 E -.15(ve)-.2 G 2.5(do).15 G 2.5(nt)-2.5 G(he kill-ring.)
-2.5 E F1(delete\255horizontal\255space \(M\255\\\))108 484.8 Q F0
(Delete all spaces and tabs around point.)144 496.8 Q F1(kill\255r)108
508.8 Q(egion)-.18 E F0(Kill the te)144 520.8 Q(xt in the current re)
-.15 E(gion.)-.15 E F1(copy\255r)108 532.8 Q(egion\255as\255kill)-.18 E
F0(Cop)144 544.8 Q 2.5(yt)-.1 G(he te)-2.5 E(xt in the re)-.15 E
(gion to the kill b)-.15 E(uf)-.2 E(fer)-.25 E(.)-.55 E F1
(copy\255backward\255w)108 556.8 Q(ord)-.1 E F0(Cop)144 568.8 Q 4.801
(yt)-.1 G 2.301(he w)-4.801 F 2.301(ord before point to the kill b)-.1 F
(uf)-.2 E(fer)-.25 E 7.301(.T)-.55 G 2.301(he w)-7.301 F 2.3
(ord boundaries are the same as)-.1 F F1(back-)4.8 E(ward\255w)144 580.8
Q(ord)-.1 E F0(.)A F1(copy\255f)108 592.8 Q(orward\255w)-.25 E(ord)-.1 E
F0(Cop)144 604.8 Q 4.507(yt)-.1 G 2.007(he w)-4.507 F 2.007(ord follo)
-.1 F 2.007(wing point to the kill b)-.25 F(uf)-.2 E(fer)-.25 E 7.008
(.T)-.55 G 2.008(he w)-7.008 F 2.008(ord boundaries are the same as)-.1
F F1 -.25(fo)4.508 G -.37(r-).25 G(ward\255w)144 616.8 Q(ord)-.1 E F0(.)
A F1(yank \(C\255y\))108 628.8 Q F0 -1(Ya)144 640.8 S
(nk the top of the kill ring into the b)1 E(uf)-.2 E(fer at point.)-.25
E F1(yank\255pop \(M\255y\))108 652.8 Q F0
(Rotate the kill ring, and yank the ne)144 664.8 Q 2.5(wt)-.25 G 2.5
(op. Only)-2.5 F -.1(wo)2.5 G(rks follo).1 E(wing)-.25 E F1(yank)2.5 E
F0(or)2.5 E F1(yank\255pop)2.5 E F0(.)A F1(Numeric Ar)87 681.6 Q
(guments)-.1 E(digit\255ar)108 693.6 Q
(gument \(M\2550, M\2551, ..., M\255\255\))-.1 E F0 .367
(Add this digit to the ar)144 705.6 R .367
(gument already accumulating, or start a ne)-.18 F 2.867(wa)-.25 G -.18
(rg)-2.867 G 2.867(ument. M\255\255).18 F .366(starts a ne)2.867 F -.05
(ga)-.15 G(-).05 E(ti)144 717.6 Q .3 -.15(ve a)-.25 H -.18(rg).15 G
(ument.).18 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(49)190.395
E 0 Cg EP
%%Page: 50 50
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(uni)108 84 Q -.1(ve)-.1 G(rsal\255ar).1 E(gument)-.1 E F0 .778
(This is another w)144 96 R .779(ay to specify an ar)-.1 F 3.279
(gument. If)-.18 F .779(this command is follo)3.279 F .779
(wed by one or more digits,)-.25 F 1.376
(optionally with a leading minus sign, those digits de\214ne the ar)144
108 R 3.876(gument. If)-.18 F 1.376(the command is fol-)3.876 F(lo)144
120 Q 1.17(wed by digits, e)-.25 F -.15(xe)-.15 G(cuting).15 E F1(uni)
3.67 E -.1(ve)-.1 G(rsal\255ar).1 E(gument)-.1 E F0(ag)3.67 E 1.17
(ain ends the numeric ar)-.05 F 1.17(gument, b)-.18 F 1.17(ut is other)
-.2 F(-)-.2 E .899(wise ignored.)144 132 R .898
(As a special case, if this command is immediately follo)5.899 F .898
(wed by a character that is)-.25 F 1.23
(neither a digit nor minus sign, the ar)144 144 R 1.23
(gument count for the ne)-.18 F 1.23(xt command is multiplied by four)
-.15 F(.)-.55 E .823(The ar)144 156 R .823
(gument count is initially one, so e)-.18 F -.15(xe)-.15 G .823
(cuting this function the \214rst time mak).15 F .822(es the ar)-.1 F
(gument)-.18 E(count four)144 168 Q 2.5(,as)-.4 G(econd time mak)-2.5 E
(es the ar)-.1 E(gument count sixteen, and so on.)-.18 E F1(Completing)
87 184.8 Q(complete \(T)108 196.8 Q(AB\))-.9 E F0 1.137
(Attempt to perform completion on the te)144 208.8 R 1.137
(xt before point.)-.15 F F1(Bash)6.137 E F0 1.137
(attempts completion treating the)3.637 F(te)144 220.8 Q .533(xt as a v)
-.15 F .533(ariable \(if the te)-.25 F .533(xt be)-.15 F .533(gins with)
-.15 F F1($)3.033 E F0 .533(\), username \(if the te)B .532(xt be)-.15 F
.532(gins with)-.15 F F1(~)3.032 E F0 .532(\), hostname \(if the)B(te)
144 232.8 Q .701(xt be)-.15 F .701(gins with)-.15 F F1(@)3.201 E F0 .701
(\), or command \(including aliases and functions\) in turn.)B .702
(If none of these pro-)5.701 F
(duces a match, \214lename completion is attempted.)144 244.8 Q F1
(possible\255completions \(M\255?\))108 256.8 Q F0
(List the possible completions of the te)144 268.8 Q(xt before point.)
-.15 E F1(insert\255completions \(M\255*\))108 280.8 Q F0 .783
(Insert all completions of the te)144 292.8 R .783
(xt before point that w)-.15 F .783(ould ha)-.1 F 1.083 -.15(ve b)-.2 H
.783(een generated by).15 F F1(possible\255com-)3.282 E(pletions)144
304.8 Q F0(.)A F1(menu\255complete)108 316.8 Q F0 .928(Similar to)144
328.8 R F1(complete)3.428 E F0 3.428(,b)C .929(ut replaces the w)-3.628
F .929(ord to be completed with a single match from the list of)-.1 F
1.194(possible completions.)144 340.8 R 1.194(Repeated e)6.194 F -.15
(xe)-.15 G 1.194(cution of).15 F F1(menu\255complete)3.694 E F0 1.193
(steps through the list of possible)3.694 F .828
(completions, inserting each match in turn.)144 352.8 R .828
(At the end of the list of completions, the bell is rung)5.828 F .727
(\(subject to the setting of)144 364.8 R F1(bell\255style)3.227 E F0
3.227(\)a)C .727(nd the original te)-3.227 F .727(xt is restored.)-.15 F
.727(An ar)5.727 F .727(gument of)-.18 F/F2 10/Times-Italic@0 SF(n)3.227
E F0(mo)3.227 E -.15(ve)-.15 G(s).15 E F2(n)3.227 E F0 1.73
(positions forw)144 376.8 R 1.73(ard in the list of matches; a ne)-.1 F
-.05(ga)-.15 G(ti).05 E 2.03 -.15(ve a)-.25 H -.18(rg).15 G 1.73
(ument may be used to mo).18 F 2.03 -.15(ve b)-.15 H(ackw).15 E(ard)-.1
E(through the list.)144 388.8 Q(This command is intended to be bound to)
5 E F1 -.9(TA)2.5 G(B).9 E F0 2.5(,b)C(ut is unbound by def)-2.7 E
(ault.)-.1 E F1(menu\255complete\255backward)108 400.8 Q F0 .82
(Identical to)144 412.8 R F1(menu\255complete)3.32 E F0 3.32(,b)C .82
(ut mo)-3.52 F -.15(ve)-.15 G 3.32(sb).15 G(ackw)-3.32 E .82
(ard through the list of possible completions, as if)-.1 F F1
(menu\255complete)144 424.8 Q F0(had been gi)2.5 E -.15(ve)-.25 G 2.5
(nan).15 G -2.25 -.15(eg a)-2.5 H(ti).15 E .3 -.15(ve a)-.25 H -.18(rg)
.15 G 2.5(ument. This).18 F(command is unbound by def)2.5 E(ault.)-.1 E
F1(delete\255char\255or\255list)108 436.8 Q F0 .234
(Deletes the character under the cursor if not at the be)144 448.8 R
.234(ginning or end of the line \(lik)-.15 F(e)-.1 E F1(delete\255char)
2.735 E F0(\).)A .425(If at the end of the line, beha)144 460.8 R -.15
(ve)-.2 G 2.925(si).15 G .425(dentically to)-2.925 F F1
(possible\255completions)2.925 E F0 5.425(.T)C .425
(his command is unbound)-5.425 F(by def)144 472.8 Q(ault.)-.1 E F1
(complete\255\214lename \(M\255/\))108 484.8 Q F0
(Attempt \214lename completion on the te)144 496.8 Q(xt before point.)
-.15 E F1(possible\255\214lename\255completions \(C\255x /\))108 508.8 Q
F0(List the possible completions of the te)144 520.8 Q
(xt before point, treating it as a \214lename.)-.15 E F1
(complete\255user)108 532.8 Q(name \(M\255~\))-.15 E F0
(Attempt completion on the te)144 544.8 Q
(xt before point, treating it as a username.)-.15 E F1(possible\255user)
108 556.8 Q(name\255completions \(C\255x ~\))-.15 E F0
(List the possible completions of the te)144 568.8 Q
(xt before point, treating it as a username.)-.15 E F1(complete\255v)108
580.8 Q(ariable \(M\255$\))-.1 E F0(Attempt completion on the te)144
592.8 Q(xt before point, treating it as a shell v)-.15 E(ariable.)-.25 E
F1(possible\255v)108 604.8 Q(ariable\255completions \(C\255x $\))-.1 E
F0(List the possible completions of the te)144 616.8 Q
(xt before point, treating it as a shell v)-.15 E(ariable.)-.25 E F1
(complete\255hostname \(M\255@\))108 628.8 Q F0
(Attempt completion on the te)144 640.8 Q
(xt before point, treating it as a hostname.)-.15 E F1
(possible\255hostname\255completions \(C\255x @\))108 652.8 Q F0
(List the possible completions of the te)144 664.8 Q
(xt before point, treating it as a hostname.)-.15 E F1
(complete\255command \(M\255!\))108 676.8 Q F0 .58
(Attempt completion on the te)144 688.8 R .581
(xt before point, treating it as a command name.)-.15 F .581
(Command comple-)5.581 F .715(tion attempts to match the te)144 700.8 R
.715(xt ag)-.15 F .715(ainst aliases, reserv)-.05 F .715(ed w)-.15 F
.715(ords, shell functions, shell b)-.1 F .715(uiltins, and)-.2 F
(\214nally e)144 712.8 Q -.15(xe)-.15 G
(cutable \214lenames, in that order).15 E(.)-.55 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(50)190.395 E 0 Cg EP
%%Page: 51 51
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(possible\255command\255completions \(C\255x !\))108 84 Q F0
(List the possible completions of the te)144 96 Q
(xt before point, treating it as a command name.)-.15 E F1
(dynamic\255complete\255history \(M\255T)108 108 Q(AB\))-.9 E F0 .424
(Attempt completion on the te)144 120 R .425
(xt before point, comparing the te)-.15 F .425(xt ag)-.15 F .425
(ainst lines from the history list)-.05 F
(for possible completion matches.)144 132 Q F1(dab)108 144 Q(br)-.1 E
-.15(ev)-.18 G(\255expand).15 E F0 .611
(Attempt menu completion on the te)144 156 R .611
(xt before point, comparing the te)-.15 F .61(xt ag)-.15 F .61
(ainst lines from the his-)-.05 F
(tory list for possible completion matches.)144 168 Q F1
(complete\255into\255braces \(M\255{\))108 180 Q F0 .4(Perform \214lena\
me completion and insert the list of possible completions enclosed with\
in braces so)144 192 R(the list is a)144 204 Q -.25(va)-.2 G
(ilable to the shell \(see).25 E F1(Brace Expansion)2.5 E F0(abo)2.5 E
-.15(ve)-.15 G(\).).15 E F1 -.25(Ke)87 220.8 S(yboard Macr).25 E(os)-.18
E(start\255kbd\255macr)108 232.8 Q 2.5(o\()-.18 G(C\255x \()-2.5 E(\))
.833 E F0(Be)144 244.8 Q(gin sa)-.15 E
(ving the characters typed into the current k)-.2 E -.15(ey)-.1 G
(board macro.).15 E F1(end\255kbd\255macr)108 256.8 Q 2.5(o\()-.18 G
(C\255x \))-2.5 E(\)).833 E F0(Stop sa)144 268.8 Q
(ving the characters typed into the current k)-.2 E -.15(ey)-.1 G
(board macro and store the de\214nition.).15 E F1
(call\255last\255kbd\255macr)108 280.8 Q 2.5(o\()-.18 G(C\255x e\))-2.5
E F0(Re-e)144 292.8 Q -.15(xe)-.15 G 1(cute the last k).15 F -.15(ey)-.1
G .999(board macro de\214ned, by making the characters in the macro app\
ear as if).15 F(typed at the k)144 304.8 Q -.15(ey)-.1 G(board.).15 E F1
(print\255last\255kbd\255macr)108 316.8 Q 2.5(o\()-.18 G(\))-2.5 E F0
(Print the last k)144 328.8 Q -.15(ey)-.1 G
(board macro de\214ned in a format suitable for the).15 E/F2 10
/Times-Italic@0 SF(inputr)2.5 E(c)-.37 E F0(\214le.)2.5 E F1
(Miscellaneous)87 345.6 Q -.18(re)108 357.6 S<ad72>.18 E
(ead\255init\255\214le \(C\255x C\255r\))-.18 E F0 1.776
(Read in the contents of the)144 369.6 R F2(inputr)4.276 E(c)-.37 E F0
1.777(\214le, and incorporate an)4.276 F 4.277(yb)-.15 G 1.777
(indings or v)-4.277 F 1.777(ariable assignments)-.25 F(found there.)144
381.6 Q F1(abort \(C\255g\))108 393.6 Q F0 3.249
(Abort the current editing command and ring the terminal')144 405.6 R
5.748(sb)-.55 G 3.248(ell \(subject to the setting of)-5.748 F F1
(bell\255style)144 417.6 Q F0(\).)A F1(do\255lo)108 429.6 Q(wer)-.1 E
(case\255v)-.18 E(ersion \(M\255A, M\255B, M\255)-.1 E F2(x)A F1 2.5(,.)
C(..\))-2.5 E F0 1.738(If the meta\214ed character)144 441.6 R F2(x)
4.238 E F0 1.739
(is uppercase, run the command that is bound to the corresponding)4.238
F(meta\214ed lo)144 453.6 Q(wercase character)-.25 E 5(.T)-.55 G
(he beha)-5 E(vior is unde\214ned if)-.2 E F2(x)2.5 E F0(is already lo)
2.5 E(wercase.)-.25 E F1(pr)108 465.6 Q(e\214x\255meta \(ESC\))-.18 E F0
(Metafy the ne)144 477.6 Q(xt character typed.)-.15 E/F3 9/Times-Bold@0
SF(ESC)5 E F1(f)2.25 E F0(is equi)2.5 E -.25(va)-.25 G(lent to).25 E F1
(Meta\255f)2.5 E F0(.)A F1(undo \(C\255_, C\255x C\255u\))108 489.6 Q F0
(Incremental undo, separately remembered for each line.)144 501.6 Q F1
-2.29 -.18(re v)108 513.6 T(ert\255line \(M\255r\)).08 E F0 .231
(Undo all changes made to this line.)144 525.6 R .231(This is lik)5.231
F 2.731(ee)-.1 G -.15(xe)-2.881 G .23(cuting the).15 F F1(undo)2.73 E F0
.23(command enough times to re-)2.73 F
(turn the line to its initial state.)144 537.6 Q F1
(tilde\255expand \(M\255&\))108 549.6 Q F0(Perform tilde e)144 561.6 Q
(xpansion on the current w)-.15 E(ord.)-.1 E F1
(set\255mark \(C\255@, M\255<space>\))108 573.6 Q F0
(Set the mark to the point.)144 585.6 Q(If a numeric ar)5 E
(gument is supplied, the mark is set to that position.)-.18 E F1
(exchange\255point\255and\255mark \(C\255x C\255x\))108 597.6 Q F0(Sw)
144 609.6 Q .282(ap the point with the mark.)-.1 F .283
(The current cursor position is set to the sa)5.283 F -.15(ve)-.2 G
2.783(dp).15 G .283(osition, and the old)-2.783 F(cursor position is sa)
144 621.6 Q -.15(ve)-.2 G 2.5(da).15 G 2.5(st)-2.5 G(he mark.)-2.5 E F1
(character\255sear)108 633.6 Q(ch \(C\255]\))-.18 E F0 3.036(Ac)144
645.6 S .536(haracter is read and point is mo)-3.036 F -.15(ve)-.15 G
3.035(dt).15 G 3.035(ot)-3.035 G .535(he ne)-3.035 F .535
(xt occurrence of that character)-.15 F 5.535(.A)-.55 G(ne)-2.5 E -.05
(ga)-.15 G(ti).05 E .835 -.15(ve c)-.25 H(ount).15 E(searches for pre)
144 657.6 Q(vious occurrences.)-.25 E F1(character\255sear)108 669.6 Q
(ch\255backward \(M\255C\255]\))-.18 E F0 3.543(Ac)144 681.6 S 1.043
(haracter is read and point is mo)-3.543 F -.15(ve)-.15 G 3.544(dt).15 G
3.544(ot)-3.544 G 1.044(he pre)-3.544 F 1.044
(vious occurrence of that character)-.25 F 6.044(.A)-.55 G(ne)-2.5 E
-.05(ga)-.15 G(ti).05 E -.15(ve)-.25 G
(count searches for subsequent occurrences.)144 693.6 Q F1
(skip\255csi\255sequence)108 705.6 Q F0 1.827
(Read enough characters to consume a multi-k)144 717.6 R 2.126 -.15
(ey s)-.1 H 1.826(equence such as those de\214ned for k).15 F -.15(ey)
-.1 G 4.326(sl).15 G(ik)-4.326 E(e)-.1 E .79(Home and End.)144 729.6 R
.791(Such sequences be)5.79 F .791
(gin with a Control Sequence Indicator \(CSI\), usually ESC\255[.)-.15 F
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(51)190.395 E 0 Cg EP
%%Page: 52 52
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .332
(If this sequence is bound to "\\[", k)144 84 R -.15(ey)-.1 G 2.831(sp)
.15 G .331(roducing such sequences will ha)-2.831 F .631 -.15(ve n)-.2 H
2.831(oe).15 G -.25(ff)-2.831 G .331(ect unless e).25 F(xplic-)-.15 E
.026(itly bound to a readline command, instead of inserting stray chara\
cters into the editing b)144 96 R(uf)-.2 E(fer)-.25 E 5.026(.T)-.55 G
(his)-5.026 E(is unbound by def)144 108 Q(ault, b)-.1 E
(ut usually bound to ESC\255[.)-.2 E/F1 10/Times-Bold@0 SF
(insert\255comment \(M\255#\))108 120 Q F0 -.4(Wi)144 132 S .481
(thout a numeric ar).4 F .481(gument, the v)-.18 F .481
(alue of the readline)-.25 F F1(comment\255begin)2.981 E F0 -.25(va)
2.981 G .48(riable is inserted at the).25 F(be)144 144 Q .244
(ginning of the current line.)-.15 F .245(If a numeric ar)5.244 F .245
(gument is supplied, this command acts as a toggle: if)-.18 F .322
(the characters at the be)144 156 R .321
(ginning of the line do not match the v)-.15 F .321(alue of)-.25 F F1
(comment\255begin)2.821 E F0 2.821(,t)C .321(he v)-2.821 F .321(alue is)
-.25 F .831(inserted, otherwise the characters in)144 168 R F1
(comment\255begin)3.331 E F0 .832(are deleted from the be)3.331 F .832
(ginning of the line.)-.15 F 1.469
(In either case, the line is accepted as if a ne)144 180 R 1.468
(wline had been typed.)-.25 F 1.468(The def)6.468 F 1.468(ault v)-.1 F
1.468(alue of)-.25 F F1(com-)3.968 E(ment\255begin)144 192 Q F0 .839
(causes this command to mak)3.339 F 3.339(et)-.1 G .839
(he current line a shell comment.)-3.339 F .84(If a numeric ar)5.84 F
(gu-)-.18 E(ment causes the comment character to be remo)144 204 Q -.15
(ve)-.15 G(d, the line will be e).15 E -.15(xe)-.15 G
(cuted by the shell.).15 E F1(glob\255complete\255w)108 216 Q
(ord \(M\255g\))-.1 E F0 .792(The w)144 228 R .791
(ord before point is treated as a pattern for pathname e)-.1 F .791
(xpansion, with an asterisk implicitly)-.15 F 2.5(appended. This)144 240
R(pattern is used to generate a list of matching \214lenames for possib\
le completions.)2.5 E F1(glob\255expand\255w)108 252 Q(ord \(C\255x *\))
-.1 E F0 .175(The w)144 264 R .176
(ord before point is treated as a pattern for pathname e)-.1 F .176
(xpansion, and the list of matching \214le-)-.15 F .516
(names is inserted, replacing the w)144 276 R 3.016(ord. If)-.1 F 3.016
(an)3.016 G .516(umeric ar)-3.016 F .516
(gument is supplied, an asterisk is appended)-.18 F(before pathname e)
144 288 Q(xpansion.)-.15 E F1(glob\255list\255expansions \(C\255x g\))
108 300 Q F0 .923(The list of e)144 312 R .923(xpansions that w)-.15 F
.923(ould ha)-.1 F 1.223 -.15(ve b)-.2 H .923(een generated by).15 F F1
(glob\255expand\255w)3.423 E(ord)-.1 E F0 .923(is displayed, and)3.423 F
.872(the line is redra)144 324 R 3.372(wn. If)-.15 F 3.372(an)3.372 G
.872(umeric ar)-3.372 F .872
(gument is supplied, an asterisk is appended before pathname)-.18 F -.15
(ex)144 336 S(pansion.).15 E F1(dump\255functions)108 348 Q F0 .626
(Print all of the functions and their k)144 360 R .926 -.15(ey b)-.1 H
.627(indings to the readline output stream.).15 F .627(If a numeric ar)
5.627 F(gu-)-.18 E
(ment is supplied, the output is formatted in such a w)144 372 Q
(ay that it can be made part of an)-.1 E/F2 10/Times-Italic@0 SF(inputr)
2.5 E(c)-.37 E F0(\214le.)2.5 E F1(dump\255v)108 384 Q(ariables)-.1 E F0
.763(Print all of the settable readline v)144 396 R .762
(ariables and their v)-.25 F .762(alues to the readline output stream.)
-.25 F .762(If a nu-)5.762 F .108(meric ar)144 408 R .108
(gument is supplied, the output is formatted in such a w)-.18 F .109
(ay that it can be made part of an)-.1 F F2(in-)2.609 E(putr)144 420 Q
(c)-.37 E F0(\214le.)2.5 E F1(dump\255macr)108 432 Q(os)-.18 E F0 .593
(Print all of the readline k)144 444 R .893 -.15(ey s)-.1 H .592
(equences bound to macros and the strings the).15 F 3.092(yo)-.15 G
3.092(utput. If)-3.092 F 3.092(an)3.092 G(umeric)-3.092 E(ar)144 456 Q
.528(gument is supplied, the output is formatted in such a w)-.18 F .528
(ay that it can be made part of an)-.1 F F2(inputr)3.028 E(c)-.37 E F0
(\214le.)144 468 Q F1(display\255shell\255v)108 480 Q
(ersion \(C\255x C\255v\))-.1 E F0(Display v)144 492 Q
(ersion information about the current instance of)-.15 E F1(bash)2.5 E
F0(.)A F1(Pr)87 508.8 Q(ogrammable Completion)-.18 E F0 .147(When w)108
520.8 R .147(ord completion is attempted for an ar)-.1 F .147
(gument to a command for which a completion speci\214cation \(a)-.18 F
F2(compspec)108 532.8 Q F0 3.828(\)h)C 1.329
(as been de\214ned using the)-3.828 F F1(complete)3.829 E F0 -.2(bu)
3.829 G 1.329(iltin \(see).2 F/F3 9/Times-Bold@0 SF 1.329(SHELL B)3.829
F(UIL)-.09 E 1.329(TIN COMMANDS)-.828 F F0(belo)3.579 E 1.329(w\), the)
-.25 F(programmable completion f)108 544.8 Q(acilities are in)-.1 E -.2
(vo)-.4 G -.1(ke).2 G(d.).1 E .498
(First, the command name is identi\214ed.)108 561.6 R .498
(If the command w)5.498 F .497
(ord is the empty string \(completion attempted at)-.1 F .233(the be)108
573.6 R .233(ginning of an empty line\), an)-.15 F 2.733(yc)-.15 G .233
(ompspec de\214ned with the)-2.733 F F1<ad45>2.733 E F0 .233(option to)
2.733 F F1(complete)2.733 E F0 .233(is used.)2.733 F .234(If a comp-)
5.234 F .481(spec has been de\214ned for that command, the compspec is \
used to generate the list of possible completions)108 585.6 R .822
(for the w)108 597.6 R 3.322(ord. If)-.1 F .822(the command w)3.322 F
.823(ord is a full pathname, a compspec for the full pathname is search\
ed for)-.1 F 2.867(\214rst. If)108 609.6 R .366(no compspec is found fo\
r the full pathname, an attempt is made to \214nd a compspec for the po\
rtion)2.867 F(follo)108 621.6 Q .298(wing the \214nal slash.)-.25 F .298
(If those searches do not result in a compspec, an)5.298 F 2.799(yc)-.15
G .299(ompspec de\214ned with the)-2.799 F F1<ad44>2.799 E F0 .057
(option to)108 633.6 R F1(complete)2.557 E F0 .056(is used as the def)
2.556 F 2.556(ault. If)-.1 F .056(there is no def)2.556 F .056
(ault compspec,)-.1 F F1(bash)2.556 E F0 .056(attempts alias e)2.556 F
.056(xpansion on)-.15 F .332(the command w)108 645.6 R .332(ord as a \
\214nal resort, and attempts to \214nd a compspec for the command w)-.1
F .332(ord from an)-.1 F 2.833(ys)-.15 G(uc-)-2.833 E(cessful e)108
657.6 Q(xpansion.)-.15 E .817(Once a compspec has been found, it is use\
d to generate the list of matching w)108 674.4 R 3.317(ords. If)-.1 F
3.317(ac)3.317 G .817(ompspec is not)-3.317 F(found, the def)108 686.4 Q
(ault)-.1 E F1(bash)2.5 E F0(completion as described abo)2.5 E .3 -.15
(ve u)-.15 H(nder).15 E F1(Completing)2.5 E F0(is performed.)2.5 E .463
(First, the actions speci\214ed by the compspec are used.)108 703.2 R
.464(Only matches which are pre\214x)5.464 F .464(ed by the w)-.15 F
.464(ord being)-.1 F .596(completed are returned.)108 715.2 R .596
(When the)5.596 F F1<ad66>3.096 E F0(or)3.095 E F1<ad64>3.095 E F0 .595
(option is used for \214lename or directory name completion, the)3.095 F
(shell v)108 727.2 Q(ariable)-.25 E F3(FIGNORE)2.5 E F0
(is used to \214lter the matches.)2.25 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(52)190.395 E 0 Cg EP
%%Page: 53 53
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(An)108 84 Q 4.084
(yc)-.15 G 1.584(ompletions speci\214ed by a pathname e)-4.084 F 1.584
(xpansion pattern to the)-.15 F/F1 10/Times-Bold@0 SF<ad47>4.084 E F0
1.584(option are generated ne)4.084 F 4.084(xt. The)-.15 F -.1(wo)108 96
S .555(rds generated by the pattern need not match the w).1 F .554
(ord being completed.)-.1 F(The)5.554 E/F2 9/Times-Bold@0 SF(GLOBIGNORE)
3.054 E F0 .554(shell v)2.804 F(ari-)-.25 E
(able is not used to \214lter the matches, b)108 108 Q(ut the)-.2 E F2
(FIGNORE)2.5 E F0 -.25(va)2.25 G(riable is used.).25 E(Ne)108 124.8 Q
.32(xt, the string speci\214ed as the ar)-.15 F .32(gument to the)-.18 F
F1<ad57>2.82 E F0 .321(option is considered.)2.821 F .321
(The string is \214rst split using the)5.321 F .413(characters in the)
108 136.8 R F2(IFS)2.913 E F0 .412(special v)2.663 F .412
(ariable as delimiters.)-.25 F .412(Shell quoting is honored.)5.412 F
.412(Each w)5.412 F .412(ord is then e)-.1 F(xpanded)-.15 E .091
(using brace e)108 148.8 R .091(xpansion, tilde e)-.15 F .092
(xpansion, parameter and v)-.15 F .092(ariable e)-.25 F .092
(xpansion, command substitution, and arith-)-.15 F 1.397(metic e)108
160.8 R 1.396(xpansion, as described abo)-.15 F 1.696 -.15(ve u)-.15 H
(nder).15 E F2(EXP)3.896 E(ANSION)-.666 E/F3 9/Times-Roman@0 SF(.)A F0
1.396(The results are split using the rules described)5.896 F(abo)108
172.8 Q .509 -.15(ve u)-.15 H(nder).15 E F1 -.75(Wo)2.709 G .209
(rd Splitting).75 F F0 5.209(.T)C .209(he results of the e)-5.209 F .209
(xpansion are pre\214x-matched ag)-.15 F .21(ainst the w)-.05 F .21
(ord being com-)-.1 F(pleted, and the matching w)108 184.8 Q
(ords become the possible completions.)-.1 E .234
(After these matches ha)108 201.6 R .534 -.15(ve b)-.2 H .234
(een generated, an).15 F 2.734(ys)-.15 G .233
(hell function or command speci\214ed with the)-2.734 F F1<ad46>2.733 E
F0(and)2.733 E F1<ad43>2.733 E F0(op-)2.733 E 4.208(tions is in)108
213.6 R -.2(vo)-.4 G -.1(ke).2 G 6.708(d. When).1 F 4.209
(the command or function is in)6.708 F -.2(vo)-.4 G -.1(ke).2 G 4.209
(d, the).1 F F2(COMP_LINE)6.709 E F3(,)A F2(COMP_POINT)6.459 E F3(,)A F2
(COMP_KEY)108 225.6 Q F3(,)A F0(and)2.408 E F2(COMP_TYPE)2.658 E F0 -.25
(va)2.408 G .157(riables are assigned v).25 F .157
(alues as described abo)-.25 F .457 -.15(ve u)-.15 H(nder).15 E F1 .157
(Shell V)2.657 F(ariables)-.92 E F0 5.157(.I)C(f)-5.157 E 3.485(as)108
237.6 S .986(hell function is being in)-3.485 F -.2(vo)-.4 G -.1(ke).2 G
.986(d, the).1 F F2(COMP_W)3.486 E(ORDS)-.09 E F0(and)3.236 E F2
(COMP_CW)3.486 E(ORD)-.09 E F0 -.25(va)3.236 G .986
(riables are also set.).25 F(When)5.986 E .347
(the function or command is in)108 249.6 R -.2(vo)-.4 G -.1(ke).2 G .347
(d, the \214rst ar).1 F .346(gument \()-.18 F F1($1)A F0 2.846(\)i)C
2.846(st)-2.846 G .346(he name of the command whose ar)-2.846 F(guments)
-.18 E .263(are being completed, the second ar)108 261.6 R .263
(gument \()-.18 F F1($2)A F0 2.763(\)i)C 2.763(st)-2.763 G .264(he w)
-2.763 F .264(ord being completed, and the third ar)-.1 F .264
(gument \()-.18 F F1($3)A F0 2.764(\)i)C(s)-2.764 E .629(the w)108 273.6
R .629(ord preceding the w)-.1 F .629
(ord being completed on the current command line.)-.1 F .628
(No \214ltering of the generated)5.629 F .714(completions ag)108 285.6 R
.714(ainst the w)-.05 F .714(ord being completed is performed; the func\
tion or command has complete free-)-.1 F(dom in generating the matches.)
108 297.6 Q(An)108 314.4 Q 2.938(yf)-.15 G .437
(unction speci\214ed with)-2.938 F F1<ad46>2.937 E F0 .437(is in)2.937 F
-.2(vo)-.4 G -.1(ke).2 G 2.937<648c>.1 G 2.937(rst. The)-2.937 F .437
(function may use an)2.937 F 2.937(yo)-.15 G 2.937(ft)-2.937 G .437
(he shell f)-2.937 F .437(acilities, including)-.1 F(the)108 326.4 Q F1
(compgen)2.956 E F0 -.2(bu)2.956 G .456(iltin described belo).2 F 1.756
-.65(w, t)-.25 H 2.956(og).65 G .456(enerate the matches.)-2.956 F .457
(It must put the possible completions in the)5.456 F F2(COMPREPL)108
338.4 Q(Y)-.828 E F0(array v)2.25 E(ariable, one per array element.)-.25
E(Ne)108 355.2 Q .081(xt, an)-.15 F 2.581(yc)-.15 G .081
(ommand speci\214ed with the)-2.581 F F1<ad43>2.581 E F0 .081
(option is in)2.581 F -.2(vo)-.4 G -.1(ke).2 G 2.581(di).1 G 2.58(na)
-2.581 G 2.58(ne)-2.58 G -.4(nv)-2.58 G .08(ironment equi).4 F -.25(va)
-.25 G .08(lent to command sub-).25 F 2.858(stitution. It)108 367.2 R
.359(should print a list of completions, one per line, to the standard \
output.)2.858 F .359(Backslash may be used)5.359 F(to escape a ne)108
379.2 Q(wline, if necessary)-.25 E(.)-.65 E .377
(After all of the possible completions are generated, an)108 396 R 2.877
<798c>-.15 G .377(lter speci\214ed with the)-2.877 F F1<ad58>2.876 E F0
.376(option is applied to the)2.876 F 3.181(list. The)108 408 R .681
(\214lter is a pattern as used for pathname e)3.181 F .681(xpansion; a)
-.15 F F1(&)3.181 E F0 .682(in the pattern is replaced with the te)3.182
F .682(xt of)-.15 F .523(the w)108 420 R .523(ord being completed.)-.1 F
3.023(Al)5.523 G(iteral)-3.023 E F1(&)3.023 E F0 .522
(may be escaped with a backslash; the backslash is remo)3.022 F -.15(ve)
-.15 G 3.022(db).15 G(efore)-3.022 E .849(attempting a match.)108 432 R
(An)5.849 E 3.349(yc)-.15 G .849
(ompletion that matches the pattern will be remo)-3.349 F -.15(ve)-.15 G
3.35(df).15 G .85(rom the list.)-3.35 F 3.35(Al)5.85 G(eading)-3.35 E F1
(!)3.35 E F0(ne)108 444 Q -.05(ga)-.15 G .764
(tes the pattern; in this case an).05 F 3.264(yc)-.15 G .764
(ompletion not matching the pattern will be remo)-3.264 F -.15(ve)-.15 G
3.264(d. If).15 F(the)3.264 E F1(nocase-)3.264 E(match)108 456 Q F0
(shell option is enabled, the match is performed without re)2.5 E -.05
(ga)-.15 G(rd to the case of alphabetic characters.).05 E(Finally)108
472.8 Q 3.086(,a)-.65 G .886 -.15(ny p)-3.086 H .586(re\214x and suf).15
F .587(\214x speci\214ed with the)-.25 F F1<ad50>3.087 E F0(and)3.087 E
F1<ad53>3.087 E F0 .587(options are added to each member of the com-)
3.087 F(pletion list, and the result is returned to the readline comple\
tion code as the list of possible completions.)108 484.8 Q .247
(If the pre)108 501.6 R .247(viously-applied actions do not generate an)
-.25 F 2.747(ym)-.15 G .247(atches, and the)-2.747 F F1 .247(\255o dir)
2.747 F(names)-.15 E F0 .247(option w)2.747 F .246(as supplied to)-.1 F
F1(complete)108 513.6 Q F0(when the compspec w)2.5 E
(as de\214ned, directory name completion is attempted.)-.1 E .461
(If the)108 530.4 R F1 .462(\255o plusdirs)2.961 F F0 .462(option w)
2.962 F .462(as supplied to)-.1 F F1(complete)2.962 E F0 .462
(when the compspec w)2.962 F .462(as de\214ned, directory name com-)-.1
F(pletion is attempted and an)108 542.4 Q 2.5(ym)-.15 G
(atches are added to the results of the other actions.)-2.5 E .56
(By def)108 559.2 R .56(ault, if a compspec is found, whate)-.1 F -.15
(ve)-.25 G 3.06(ri).15 G 3.06(tg)-3.06 G .559
(enerates is returned to the completion code as the full set)-3.06 F
.631(of possible completions.)108 571.2 R .631(The def)5.631 F(ault)-.1
E F1(bash)3.131 E F0 .631
(completions are not attempted, and the readline def)3.131 F .632
(ault of \214le-)-.1 F .559(name completion is disabled.)108 583.2 R
.559(If the)5.559 F F1 .559(\255o bashdefault)3.059 F F0 .559(option w)
3.059 F .559(as supplied to)-.1 F F1(complete)3.058 E F0 .558
(when the compspec)3.058 F -.1(wa)108 595.2 S 3.171(sd).1 G .671
(e\214ned, the)-3.171 F F1(bash)3.171 E F0(def)3.171 E .671
(ault completions are attempted if the compspec generates no matches.)
-.1 F .672(If the)5.672 F F1<ad6f>3.172 E(default)108 607.2 Q F0 1.207
(option w)3.707 F 1.207(as supplied to)-.1 F F1(complete)3.707 E F0
1.207(when the compspec w)3.707 F 1.207(as de\214ned, readline')-.1 F
3.707(sd)-.55 G(ef)-3.707 E 1.206(ault completion)-.1 F
(will be performed if the compspec \(and, if attempted, the def)108
619.2 Q(ault)-.1 E F1(bash)2.5 E F0(completions\) generate no matches.)
2.5 E .245(When a compspec indicates that directory name completion is \
desired, the programmable completion func-)108 636 R .633(tions force r\
eadline to append a slash to completed names which are symbolic links t\
o directories, subject)108 648 R 2.761(to the v)108 660 R 2.761
(alue of the)-.25 F F1(mark\255dir)5.261 E(ectories)-.18 E F0 2.761
(readline v)5.261 F 2.761(ariable, re)-.25 F -.05(ga)-.15 G 2.762
(rdless of the setting of the).05 F F1(mark-sym-)5.262 E(link)108 672 Q
(ed\255dir)-.1 E(ectories)-.18 E F0(readline v)2.5 E(ariable.)-.25 E
.191(There is some support for dynamically modifying completions.)108
688.8 R .19(This is most useful when used in combina-)5.191 F 1.172
(tion with a def)108 700.8 R 1.172(ault completion speci\214ed with)-.1
F F1 1.172(complete \255D)3.672 F F0 6.172(.I)C(t')-6.172 E 3.672(sp)
-.55 G 1.172(ossible for shell functions e)-3.672 F -.15(xe)-.15 G 1.172
(cuted as).15 F .93(completion handlers to indicate that completion sho\
uld be retried by returning an e)108 712.8 R .93(xit status of 124.)-.15
F .93(If a)5.93 F .1(shell function returns 124, and changes the compsp\
ec associated with the command on which completion is)108 724.8 R
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(53)190.395 E 0 Cg EP
%%Page: 54 54
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .666
(being attempted \(supplied as the \214rst ar)108 84 R .665
(gument when the function is e)-.18 F -.15(xe)-.15 G .665
(cuted\), programmable completion).15 F .083(restarts from the be)108 96
R .084(ginning, with an attempt to \214nd a ne)-.15 F 2.584(wc)-.25 G
.084(ompspec for that command.)-2.584 F .084(This allo)5.084 F .084
(ws a set of)-.25 F(completions to be b)108 108 Q(uilt dynamically as c\
ompletion is attempted, rather than being loaded all at once.)-.2 E -.15
(Fo)108 124.8 S 2.637(ri).15 G .137
(nstance, assuming that there is a library of compspecs, each k)-2.637 F
.137(ept in a \214le corresponding to the name of)-.1 F
(the command, the follo)108 136.8 Q(wing def)-.25 E
(ault completion function w)-.1 E(ould load completions dynamically:)-.1
E/F1 10/Courier@0 SF(_completion_loader\(\))108 153.6 Q({)108 165.6 Q 6
(.")144 177.6 S
(/etc/bash_completion.d/$1.sh" >/dev/null 2>&1 && return 124)-6 E(})108
189.6 Q(complete -D -F _completion_loader -o bashdefault -o default)108
201.6 Q/F2 10.95/Times-Bold@0 SF(HIST)72 230.4 Q(OR)-.197 E(Y)-.383 E F0
.371(When the)108 242.4 R/F3 10/Times-Bold@0 SF .371(\255o history)2.871
F F0 .371(option to the)2.871 F F3(set)2.872 E F0 -.2(bu)2.872 G .372
(iltin is enabled, the shell pro).2 F .372(vides access to the)-.15 F/F4
10/Times-Italic@0 SF .372(command history)2.872 F F0(,)A .305
(the list of commands pre)108 254.4 R .305(viously typed.)-.25 F .305
(The v)5.305 F .304(alue of the)-.25 F/F5 9/Times-Bold@0 SF(HISTSIZE)
2.804 E F0 -.25(va)2.554 G .304(riable is used as the number of com-).25
F .429(mands to sa)108 266.4 R .729 -.15(ve i)-.2 H 2.929(nah).15 G .429
(istory list.)-2.929 F .429(The te)5.429 F .429(xt of the last)-.15 F F5
(HISTSIZE)2.93 E F0 .43(commands \(def)2.68 F .43(ault 500\) is sa)-.1 F
-.15(ve)-.2 G 2.93(d. The).15 F(shell)2.93 E .287
(stores each command in the history list prior to parameter and v)108
278.4 R .287(ariable e)-.25 F .287(xpansion \(see)-.15 F F5(EXP)2.787 E
(ANSION)-.666 E F0(abo)2.537 E -.15(ve)-.15 G(\)).15 E -.2(bu)108 290.4
S 4.065(ta).2 G 1.565(fter history e)-4.065 F 1.565
(xpansion is performed, subject to the v)-.15 F 1.565
(alues of the shell v)-.25 F(ariables)-.25 E F5(HISTIGNORE)4.065 E F0
(and)3.816 E F5(HISTCONTR)108 302.4 Q(OL)-.27 E/F6 9/Times-Roman@0 SF(.)
A F0 .082
(On startup, the history is initialized from the \214le named by the v)
108 319.2 R(ariable)-.25 E F5(HISTFILE)2.582 E F0(\(def)2.332 E(ault)-.1
E F4(~/.bash_history)2.582 E F0(\).)A .315(The \214le named by the v)108
331.2 R .315(alue of)-.25 F F5(HISTFILE)2.815 E F0 .315
(is truncated, if necessary)2.565 F 2.815(,t)-.65 G 2.815(oc)-2.815 G
.315(ontain no more than the number of)-2.815 F .659
(lines speci\214ed by the v)108 343.2 R .659(alue of)-.25 F F5
(HISTFILESIZE)3.158 E F6(.)A F0(If)5.158 E F3(HISTFILESIZE)3.158 E F0
.658(is unset, or set to null, a non-numeric)3.158 F -.25(va)108 355.2 S
.142(lue, or a numeric v).25 F .142
(alue less than zero, the history \214le is not truncated.)-.25 F .142
(When the history \214le is read, lines)5.142 F(be)108 367.2 Q 1.605
(ginning with the history comment character follo)-.15 F 1.604
(wed immediately by a digit are interpreted as time-)-.25 F .15
(stamps for the follo)108 379.2 R .15(wing history line.)-.25 F .151
(These timestamps are optionally displayed depending on the v)5.151 F
.151(alue of)-.25 F(the)108 391.2 Q F5(HISTTIMEFORMA)3.559 E(T)-.855 E
F0 -.25(va)3.309 G 3.559(riable. When).25 F 3.559(as)3.559 G 1.059
(hell with history enabled e)-3.559 F 1.059(xits, the last)-.15 F F5
($HISTSIZE)3.559 E F0 1.058(lines are)3.309 F .158
(copied from the history list to)108 403.2 R F5($HISTFILE)2.658 E F6(.)A
F0 .158(If the)4.658 F F3(histappend)2.658 E F0 .159
(shell option is enabled \(see the description of)2.659 F F3(shopt)108
415.2 Q F0(under)2.582 E F5 .082(SHELL B)2.582 F(UIL)-.09 E .082
(TIN COMMANDS)-.828 F F0(belo)2.332 E .082
(w\), the lines are appended to the history \214le, otherwise the)-.25 F
.196(history \214le is o)108 427.2 R -.15(ve)-.15 G 2.696(rwritten. If)
.15 F F5(HISTFILE)2.696 E F0 .197(is unset, or if the history \214le is\
 unwritable, the history is not sa)2.446 F -.15(ve)-.2 G(d.).15 E .584
(If the)108 439.2 R F5(HISTTIMEFORMA)3.084 E(T)-.855 E F0 -.25(va)2.834
G .584
(riable is set, time stamps are written to the history \214le, mark).25
F .583(ed with the his-)-.1 F 1.147(tory comment character)108 451.2 R
3.647(,s)-.4 G 3.647(ot)-3.647 G(he)-3.647 E 3.647(ym)-.15 G 1.147
(ay be preserv)-3.647 F 1.147(ed across shell sessions.)-.15 F 1.148
(This uses the history comment)6.148 F 1.377
(character to distinguish timestamps from other history lines.)108 463.2
R 1.377(After sa)6.377 F 1.377(ving the history)-.2 F 3.876(,t)-.65 G
1.376(he history \214le is)-3.876 F .756
(truncated to contain no more than)108 475.2 R F5(HISTFILESIZE)3.257 E
F0 3.257(lines. If)3.007 F F5(HISTFILESIZE)3.257 E F0 .757
(is unset, or set to null, a non-)3.007 F(numeric v)108 487.2 Q
(alue, or a numeric v)-.25 E
(alue less than zero, the history \214le is not truncated.)-.25 E .299
(The b)108 504 R .299(uiltin command)-.2 F F3(fc)2.799 E F0(\(see)2.799
E F5 .299(SHELL B)2.799 F(UIL)-.09 E .299(TIN COMMANDS)-.828 F F0(belo)
2.549 E .298(w\) may be used to list or edit and re-e)-.25 F -.15(xe)
-.15 G(-).15 E .471(cute a portion of the history list.)108 516 R(The)
5.471 E F3(history)2.971 E F0 -.2(bu)2.971 G .472
(iltin may be used to display or modify the history list and).2 F .002
(manipulate the history \214le.)108 528 R .001
(When using command-line editing, search commands are a)5.002 F -.25(va)
-.2 G .001(ilable in each edit-).25 F(ing mode that pro)108 540 Q
(vide access to the history list.)-.15 E 1.485(The shell allo)108 556.8
R 1.485(ws control o)-.25 F -.15(ve)-.15 G 3.986(rw).15 G 1.486
(hich commands are sa)-3.986 F -.15(ve)-.2 G 3.986(do).15 G 3.986(nt)
-3.986 G 1.486(he history list.)-3.986 F(The)6.486 E F5(HISTCONTR)3.986
E(OL)-.27 E F0(and)3.736 E F5(HISTIGNORE)108 568.8 Q F0 -.25(va)2.708 G
.458(riables may be set to cause the shell to sa).25 F .757 -.15(ve o)
-.2 H .457(nly a subset of the commands entered.).15 F(The)5.457 E F3
(cmdhist)108 580.8 Q F0 .75
(shell option, if enabled, causes the shell to attempt to sa)3.25 F 1.05
-.15(ve e)-.2 H .75(ach line of a multi-line command in).15 F 1.077
(the same history entry)108 592.8 R 3.577(,a)-.65 G 1.077
(dding semicolons where necessary to preserv)-3.577 F 3.577(es)-.15 G
1.077(yntactic correctness.)-3.577 F(The)6.077 E F3(lithist)3.576 E F0
.373(shell option causes the shell to sa)108 604.8 R .674 -.15(ve t)-.2
H .374(he command with embedded ne).15 F .374
(wlines instead of semicolons.)-.25 F .374(See the)5.374 F .319
(description of the)108 616.8 R F3(shopt)2.819 E F0 -.2(bu)2.819 G .318
(iltin belo).2 F 2.818(wu)-.25 G(nder)-2.818 E F5 .318(SHELL B)2.818 F
(UIL)-.09 E .318(TIN COMMANDS)-.828 F F0 .318
(for information on setting and)2.568 F(unsetting shell options.)108
628.8 Q F2(HIST)72 645.6 Q(OR)-.197 E 2.738(YE)-.383 G(XP)-2.738 E
(ANSION)-.81 E F0 .61(The shell supports a history e)108 657.6 R .611
(xpansion feature that is similar to the history e)-.15 F .611
(xpansion in)-.15 F F3(csh)3.111 E F0 5.611(.T)C .611(his section)-5.611
F .871(describes what syntax features are a)108 669.6 R -.25(va)-.2 G
3.371(ilable. This).25 F .871(feature is enabled by def)3.371 F .87
(ault for interacti)-.1 F 1.17 -.15(ve s)-.25 H .87(hells, and).15 F
.949(can be disabled using the)108 681.6 R F3(+H)3.449 E F0 .949
(option to the)3.449 F F3(set)3.449 E F0 -.2(bu)3.449 G .949
(iltin command \(see).2 F F5 .949(SHELL B)3.449 F(UIL)-.09 E .95
(TIN COMMANDS)-.828 F F0(be-)3.2 E(lo)108 693.6 Q 2.5
(w\). Non-interacti)-.25 F .3 -.15(ve s)-.25 H
(hells do not perform history e).15 E(xpansion by def)-.15 E(ault.)-.1 E
1.306(History e)108 710.4 R 1.306(xpansions introduce w)-.15 F 1.306(or\
ds from the history list into the input stream, making it easy to repea\
t)-.1 F .209(commands, insert the ar)108 722.4 R .209(guments to a pre)
-.18 F .21
(vious command into the current input line, or \214x errors in pre)-.25
F(vious)-.25 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(54)
190.395 E 0 Cg EP
%%Page: 55 55
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E(commands quickly)
108 84 Q(.)-.65 E 1.164(History e)108 100.8 R 1.163(xpansion is perform\
ed immediately after a complete line is read, before the shell breaks i\
t into)-.15 F -.1(wo)108 112.8 S .251
(rds, and is performed on each line indi).1 F .251
(vidually without taking quoting on pre)-.25 F .252
(vious lines into account.)-.25 F(It)5.252 E(tak)108 124.8 Q .146
(es place in tw)-.1 F 2.646(op)-.1 G 2.646(arts. The)-2.646 F .146(\214\
rst is to determine which line from the history list to use during subs\
titution.)2.646 F .766(The second is to select portions of that line fo\
r inclusion into the current one.)108 136.8 R .767
(The line selected from the)5.767 F .254(history is the)108 148.8 R/F1
10/Times-Italic@0 SF -.15(ev)2.754 G(ent).15 E F0 2.753(,a)C .253
(nd the portions of that line that are acted upon are)-2.753 F F1(wor)
2.753 E(ds)-.37 E F0 5.253(.V)C(arious)-6.363 E F1(modi\214er)2.753 E(s)
-.1 E F0 .253(are a)2.753 F -.25(va)-.2 G(il-).25 E .538
(able to manipulate the selected w)108 160.8 R 3.038(ords. The)-.1 F
.538(line is brok)3.038 F .538(en into w)-.1 F .539(ords in the same f)
-.1 F .539(ashion as when reading)-.1 F .573(input, so that se)108 172.8
R -.15(ve)-.25 G(ral).15 E F1(metac)3.073 E(har)-.15 E(acter)-.15 E F0
.572(-separated w)B .572(ords surrounded by quotes are considered one w)
-.1 F 3.072(ord. His-)-.1 F .355(tory e)108 184.8 R .355
(xpansions are introduced by the appearance of the history e)-.15 F .355
(xpansion character)-.15 F 2.855(,w)-.4 G .356(hich is)-2.855 F/F2 10
/Times-Bold@0 SF(!)3.689 E F0 .356(by def)3.689 F(ault.)-.1 E .791
(Only backslash \()108 196.8 R F2(\\).833 E F0 3.291(\)a).833 G .79
(nd single quotes can quote the history e)-3.291 F .79
(xpansion character)-.15 F 3.29(,b)-.4 G .79(ut the history e)-3.49 F
(xpansion)-.15 E .789(character is also treated as quoted if it immedia\
tely precedes the closing double quote in a double-quoted)108 208.8 R
(string.)108 220.8 Q(Se)108 237.6 Q -.15(ve)-.25 G .03
(ral characters inhibit history e).15 F .03
(xpansion if found immediately follo)-.15 F .03(wing the history e)-.25
F .03(xpansion character)-.15 F(,)-.4 E -2.15 -.25(ev e)108 249.6 T
3.162(ni).25 G 3.162(fi)-3.162 G 3.162(ti)-3.162 G 3.162(su)-3.162 G
.662(nquoted: space, tab, ne)-3.162 F .662(wline, carriage return, and)
-.25 F F2(=)3.162 E F0 5.662(.I)C 3.162(ft)-5.662 G(he)-3.162 E F2
(extglob)3.162 E F0 .662(shell option is enabled,)3.162 F F2(\()3.163 E
F0(will also inhibit e)108 261.6 Q(xpansion.)-.15 E(Se)108 278.4 Q -.15
(ve)-.25 G .11(ral shell options settable with the).15 F F2(shopt)2.61 E
F0 -.2(bu)2.61 G .109(iltin may be used to tailor the beha).2 F .109
(vior of history e)-.2 F(xpansion.)-.15 E .231(If the)108 290.4 R F2
(histv)2.731 E(erify)-.1 E F0 .231
(shell option is enabled \(see the description of the)2.731 F F2(shopt)
2.731 E F0 -.2(bu)2.731 G .231(iltin belo).2 F .231(w\), and)-.25 F F2
-.18(re)2.731 G(adline).18 E F0 .232(is be-)2.732 F .449(ing used, hist\
ory substitutions are not immediately passed to the shell parser)108
302.4 R 5.449(.I)-.55 G .448(nstead, the e)-5.449 F .448
(xpanded line is)-.15 F 2.228(reloaded into the)108 314.4 R F2 -.18(re)
4.728 G(adline).18 E F0 2.228(editing b)4.728 F(uf)-.2 E 2.228
(fer for further modi\214cation.)-.25 F(If)7.228 E F2 -.18(re)4.728 G
(adline).18 E F0 2.228(is being used, and the)4.728 F F2(histr)108 326.4
Q(eedit)-.18 E F0 1.202(shell option is enabled, a f)3.702 F 1.202
(ailed history substitution will be reloaded into the)-.1 F F2 -.18(re)
3.702 G(adline).18 E F0(editing)3.702 E -.2(bu)108 338.4 S -.25(ff).2 G
.303(er for correction.).25 F(The)5.303 E F2<ad70>2.803 E F0 .303
(option to the)2.803 F F2(history)2.804 E F0 -.2(bu)2.804 G .304
(iltin command may be used to see what a history e).2 F(x-)-.15 E .52
(pansion will do before using it.)108 350.4 R(The)5.52 E F2<ad73>3.02 E
F0 .52(option to the)3.02 F F2(history)3.02 E F0 -.2(bu)3.02 G .52
(iltin may be used to add commands to the).2 F
(end of the history list without actually e)108 362.4 Q -.15(xe)-.15 G
(cuting them, so that the).15 E 2.5(ya)-.15 G(re a)-2.5 E -.25(va)-.2 G
(ilable for subsequent recall.).25 E 1.108(The shell allo)108 379.2 R
1.108(ws control of the v)-.25 F 1.108
(arious characters used by the history e)-.25 F 1.108
(xpansion mechanism \(see the de-)-.15 F .163(scription of)108 391.2 R
F2(histchars)2.663 E F0(abo)2.663 E .463 -.15(ve u)-.15 H(nder).15 E F2
.163(Shell V)2.663 F(ariables)-.92 E F0 2.663(\). The)B .162
(shell uses the history comment character to mark)2.663 F
(history timestamps when writing the history \214le.)108 403.2 Q F2(Ev)
87 420 Q(ent Designators)-.1 E F0 .204(An e)108 432 R -.15(ve)-.25 G
.204(nt designator is a reference to a command line entry in the histor\
y list.).15 F .205(Unless the reference is abso-)5.204 F(lute, e)108 444
Q -.15(ve)-.25 G(nts are relati).15 E .3 -.15(ve t)-.25 H 2.5(ot).15 G
(he current position in the history list.)-2.5 E F2(!)108 460.8 Q F0
1.608(Start a history substitution, e)144 460.8 R 1.608
(xcept when follo)-.15 F 1.607(wed by a)-.25 F F2(blank)4.107 E F0 4.107
(,n)C -.25(ew)-4.107 G 1.607(line, carriage return, = or \().25 F
(\(when the)144 472.8 Q F2(extglob)2.5 E F0
(shell option is enabled using the)2.5 E F2(shopt)2.5 E F0 -.2(bu)2.5 G
(iltin\).).2 E F2(!)108 484.8 Q F1(n)A F0(Refer to command line)144
484.8 Q F1(n)2.86 E F0(.).24 E F2<21ad>108 496.8 Q F1(n)A F0
(Refer to the current command minus)144 496.8 Q F1(n)2.86 E F0(.).24 E
F2(!!)108 508.8 Q F0(Refer to the pre)144 508.8 Q(vious command.)-.25 E
(This is a synon)5 E(ym for `!\2551'.)-.15 E F2(!)108 520.8 Q F1(string)
A F0 .865(Refer to the most recent command preceding the current positi\
on in the history list starting with)144 520.8 R F1(string)144.34 532.8
Q F0(.).22 E F2(!?)108 544.8 Q F1(string)A F2([?])A F0 1.503(Refer to t\
he most recent command preceding the current position in the history li\
st containing)144 556.8 R F1(string)144.34 568.8 Q F0 5.496(.T).22 G
.496(he trailing)-5.496 F F2(?)2.996 E F0 .496(may be omitted if)2.996 F
F1(string)3.336 E F0 .497(is follo)3.216 F .497(wed immediately by a ne)
-.25 F 2.997(wline. If)-.25 F F1(string)2.997 E F0(is)2.997 E .391(miss\
ing, the string from the most recent search is used; it is an error if \
there is no pre)144 580.8 R .39(vious search)-.25 F(string.)144 592.8 Q
/F3 12/Times-Bold@0 SF(^)108 609.8 Q F1(string1)-5 I F3(^)5 I F1
(string2)-5 I F3(^)5 I F0 .752(Quick substitution.)144 616.8 R .752
(Repeat the pre)5.752 F .753(vious command, replacing)-.25 F F1(string1)
3.593 E F0(with)3.253 E F1(string2)3.593 E F0 5.753(.E).02 G(qui)-5.753
E -.25(va)-.25 G .753(lent to).25 F -.74(``)144 628.8 S(!!:s).74 E/F4 12
/Times-Roman@0 SF(^)5 I F1(string1)-5 I F4(^)5 I F1(string2)-5 I F4(^)5
I F0 1.48 -.74('' \()-5 L(see).74 E F2(Modi\214ers)2.5 E F0(belo)2.5 E
(w\).)-.25 E F2(!#)108 640.8 Q F0(The entire command line typed so f)144
640.8 Q(ar)-.1 E(.)-.55 E F2 -.75(Wo)87 657.6 S(rd Designators).75 E F0
-.8(Wo)108 669.6 S 1.314(rd designators are used to select desired w).8
F 1.314(ords from the e)-.1 F -.15(ve)-.25 G 3.814(nt. A).15 F F2(:)
3.814 E F0 1.313(separates the e)3.813 F -.15(ve)-.25 G 1.313
(nt speci\214cation).15 F .529(from the w)108 681.6 R .529
(ord designator)-.1 F 5.529(.I)-.55 G 3.029(tm)-5.529 G .529
(ay be omitted if the w)-3.029 F .529(ord designator be)-.1 F .529
(gins with a)-.15 F F2(^)3.029 E F0(,)A F2($)3.029 E F0(,)A F2(*)3.029 E
F0(,)A F2<ad>3.029 E F0 3.029(,o)C(r)-3.029 E F2(%)3.029 E F0 5.53(.W)C
(ords)-6.33 E .516(are numbered from the be)108 693.6 R .516
(ginning of the line, with the \214rst w)-.15 F .516
(ord being denoted by 0 \(zero\).)-.1 F -.8(Wo)5.515 G .515(rds are in-)
.8 F(serted into the current line separated by single spaces.)108 705.6
Q(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(55)190.395 E 0 Cg EP
%%Page: 56 56
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF 2.5(0\()108 84 S(zer)-2.5 E(o\))-.18 E F0(The zeroth w)144 96 Q 2.5
(ord. F)-.1 F(or the shell, this is the command w)-.15 E(ord.)-.1 E/F2
10/Times-Italic@0 SF(n)108.36 108 Q F0(The)144 108 Q F2(n)2.5 E F0(th w)
A(ord.)-.1 E F1(^)108 120 Q F0(The \214rst ar)144 120 Q 2.5
(gument. That)-.18 F(is, w)2.5 E(ord 1.)-.1 E F1($)108 132 Q F0 .063
(The last w)144 132 R 2.563(ord. This)-.1 F .063(is usually the last ar)
2.563 F .064(gument, b)-.18 F .064(ut will e)-.2 F .064
(xpand to the zeroth w)-.15 F .064(ord if there is only)-.1 F(one w)144
144 Q(ord in the line.)-.1 E F1(%)108 156 Q F0 1.42(The \214rst w)144
156 R 1.42(ord matched by the most recent `?)-.1 F F2(string)A F0 1.419
(?' search, if the search string be)B 1.419(gins with a)-.15 F
(character that is part of a w)144 168 Q(ord.)-.1 E F2(x)108.77 180 Q F1
<ad>A F2(y)A F0 2.5(Ar)144 180 S(ange of w)-2.5 E(ords; `\255)-.1 E F2
(y)A F0 2.5('a)C(bbre)-2.5 E(viates `0\255)-.25 E F2(y)A F0('.)A F1(*)
108 192 Q F0 .315(All of the w)144 192 R .315(ords b)-.1 F .315
(ut the zeroth.)-.2 F .315(This is a synon)5.315 F .315(ym for `)-.15 F
F2(1\255$)A F0 2.815('. It)B .315(is not an error to use)2.815 F F1(*)
2.816 E F0 .316(if there is)2.816 F(just one w)144 204 Q(ord in the e)
-.1 E -.15(ve)-.25 G(nt; the empty string is returned in that case.).15
E F1(x*)108 216 Q F0(Abbre)144 216 Q(viates)-.25 E F2(x\255$)2.5 E F0(.)
A F1<78ad>108 228 Q F0(Abbre)144 228 Q(viates)-.25 E F2(x\255$)2.5 E F0
(lik)2.5 E(e)-.1 E F1(x*)2.5 E F0 2.5(,b)C(ut omits the last w)-2.7 E
2.5(ord. If)-.1 F F1(x)2.5 E F0(is missing, it def)2.5 E(aults to 0.)-.1
E(If a w)108 244.8 Q(ord designator is supplied without an e)-.1 E -.15
(ve)-.25 G(nt speci\214cation, the pre).15 E
(vious command is used as the e)-.25 E -.15(ve)-.25 G(nt.).15 E F1
(Modi\214ers)87 261.6 Q F0 .184(After the optional w)108 273.6 R .184
(ord designator)-.1 F 2.684(,t)-.4 G .183
(here may appear a sequence of one or more of the follo)-2.684 F .183
(wing modi\214ers,)-.25 F(each preceded by a `:'.)108 285.6 Q
(These modify)5 E 2.5(,o)-.65 G 2.5(re)-2.5 G(dit, the w)-2.5 E
(ord or w)-.1 E(ords selected from the history e)-.1 E -.15(ve)-.25 G
(nt.).15 E F1(h)108 302.4 Q F0(Remo)144 302.4 Q .3 -.15(ve a t)-.15 H
(railing \214lename component, lea).15 E(ving only the head.)-.2 E F1(t)
108 314.4 Q F0(Remo)144 314.4 Q .3 -.15(ve a)-.15 H
(ll leading \214lename components, lea).15 E(ving the tail.)-.2 E F1(r)
108 326.4 Q F0(Remo)144 326.4 Q .3 -.15(ve a t)-.15 H(railing suf).15 E
(\214x of the form)-.25 E F2(.xxx)2.5 E F0 2.5(,l)C(ea)-2.5 E
(ving the basename.)-.2 E F1(e)108 338.4 Q F0(Remo)144 338.4 Q .3 -.15
(ve a)-.15 H(ll b).15 E(ut the trailing suf)-.2 E(\214x.)-.25 E F1(p)108
350.4 Q F0(Print the ne)144 350.4 Q 2.5(wc)-.25 G(ommand b)-2.5 E
(ut do not e)-.2 E -.15(xe)-.15 G(cute it.).15 E F1(q)108 362.4 Q F0
(Quote the substituted w)144 362.4 Q
(ords, escaping further substitutions.)-.1 E F1(x)108 374.4 Q F0 .385
(Quote the substituted w)144 374.4 R .385(ords as with)-.1 F F1(q)2.885
E F0 2.885(,b)C .386(ut break into w)-3.085 F .386(ords at)-.1 F F1
(blanks)2.886 E F0 .386(and ne)2.886 F 2.886(wlines. The)-.25 F F1(q)
2.886 E F0(and)2.886 E F1(x)2.886 E F0(modi\214ers are mutually e)144
386.4 Q(xclusi)-.15 E -.15(ve)-.25 G 2.5(;t).15 G
(he last one supplied is used.)-2.5 E F1(s/)108 398.4 Q F2(old)A F1(/)A
F2(ne)A(w)-.15 E F1(/)A F0(Substitute)144 410.4 Q F2(ne)3.329 E(w)-.15 E
F0 .469(for the \214rst occurrence of)3.279 F F2(old)3.199 E F0 .469
(in the e)3.739 F -.15(ve)-.25 G .469(nt line.).15 F(An)5.469 E 2.969
(yc)-.15 G .469(haracter may be used as the)-2.969 F .953
(delimiter in place of /.)144 422.4 R .953
(The \214nal delimiter is optional if it is the last character of the e)
5.953 F -.15(ve)-.25 G .954(nt line.).15 F .131
(The delimiter may be quoted in)144 434.4 R F2(old)2.861 E F0(and)3.401
E F2(ne)2.991 E(w)-.15 E F0 .131(with a single backslash.)2.941 F .131
(If & appears in)5.131 F F2(ne)2.991 E(w)-.15 E F0 2.631(,i).31 G 2.631
(ti)-2.631 G 2.631(sr)-2.631 G(e-)-2.631 E .619(placed by)144 446.4 R F2
(old)3.349 E F0 5.619(.A).77 G .619(single backslash will quote the &.)
-2.5 F(If)5.619 E F2(old)3.349 E F0 .619(is null, it is set to the last)
3.889 F F2(old)3.349 E F0(substi-)3.89 E .487(tuted, or)144 458.4 R
2.987(,i)-.4 G 2.987(fn)-2.987 G 2.987(op)-2.987 G(re)-2.987 E .486
(vious history substitutions took place, the last)-.25 F F2(string)3.326
E F0 .486(in a)3.206 F F1(!?)2.986 E F2(string)A F1([?])A F0 2.986
(search. If)5.486 F F2(ne)144.36 470.4 Q(w)-.15 E F0
(is null, each matching)2.81 E F2(old)2.73 E F0(is deleted.)3.27 E F1(&)
108 482.4 Q F0(Repeat the pre)144 482.4 Q(vious substitution.)-.25 E F1
(g)108 494.4 Q F0 .397(Cause changes to be applied o)144 494.4 R -.15
(ve)-.15 G 2.897(rt).15 G .398(he entire e)-2.897 F -.15(ve)-.25 G .398
(nt line.).15 F .398(This is used in conjunction with `)5.398 F F1(:s)A
F0 2.898('\()C(e.g.,)-2.898 E(`)144 506.4 Q F1(:gs/)A F2(old)A F1(/)A F2
(ne)A(w)-.15 E F1(/)A F0 .351('\) or `)B F1(:&)A F0 2.851('. If)B .351
(used with `)2.851 F F1(:s)A F0 .351(', an)B 2.851(yd)-.15 G .35
(elimiter can be used in place of /, and the \214nal de-)-2.851 F
(limiter is optional if it is the last character of the e)144 518.4 Q
-.15(ve)-.25 G(nt line.).15 E(An)5 E F1(a)2.5 E F0
(may be used as a synon)2.5 E(ym for)-.15 E F1(g)2.5 E F0(.)A F1(G)108
530.4 Q F0(Apply the follo)144 530.4 Q(wing `)-.25 E F1(s)A F0 2.5('o)C
2.5(r`)-2.5 G F1(&)-2.5 E F0 2.5('m)C(odi\214er once to each w)-2.5 E
(ord in the e)-.1 E -.15(ve)-.25 G(nt line.).15 E/F3 10.95/Times-Bold@0
SF(SHELL B)72 547.2 Q(UIL)-.11 E(TIN COMMANDS)-1.007 E F0 .062
(Unless otherwise noted, each b)108 559.2 R .062(uiltin command documen\
ted in this section as accepting options preceded by)-.2 F F1<ad>108
571.2 Q F0(accepts)3.077 E F1<adad>3.077 E F0 .577
(to signify the end of the options.)3.077 F(The)5.577 E F1(:)3.077 E F0
(,)A F1(true)3.077 E F0(,)A F1(false)3.077 E F0 3.077(,a)C(nd)-3.077 E
F1(test)3.077 E F0(/)A F1([)A F0 -.2(bu)3.077 G .577
(iltins do not accept options).2 F .461(and do not treat)108 583.2 R F1
<adad>2.961 E F0(specially)2.961 E 5.461(.T)-.65 G(he)-5.461 E F1(exit)
2.961 E F0(,)A F1(logout)2.961 E F0(,)A F1 -.18(re)2.961 G(tur).18 E(n)
-.15 E F0(,)A F1(br)2.961 E(eak)-.18 E F0(,)A F1(continue)2.961 E F0(,)A
F1(let)2.961 E F0 2.961(,a)C(nd)-2.961 E F1(shift)2.961 E F0 -.2(bu)
2.962 G .462(iltins accept and).2 F .261(process ar)108 595.2 R .261
(guments be)-.18 F .261(ginning with)-.15 F F1<ad>2.761 E F0 .261
(without requiring)2.761 F F1<adad>2.761 E F0 5.261(.O)C .261(ther b)
-5.261 F .26(uiltins that accept ar)-.2 F .26(guments b)-.18 F .26
(ut are not)-.2 F 1.154(speci\214ed as accepting options interpret ar)
108 607.2 R 1.154(guments be)-.18 F 1.154(ginning with)-.15 F F1<ad>
3.654 E F0 1.154(as in)3.654 F -.25(va)-.4 G 1.154
(lid options and require).25 F F1<adad>3.654 E F0(to)3.654 E(pre)108
619.2 Q -.15(ve)-.25 G(nt this interpretation.).15 E F1(:)108 637.2 Q F0
([)2.5 E F2(ar)A(guments)-.37 E F0(])A .452(No ef)144 649.2 R .452
(fect; the command does nothing be)-.25 F .452(yond e)-.15 F(xpanding)
-.15 E F2(ar)3.282 E(guments)-.37 E F0 .451(and performing an)3.221 F
2.951(ys)-.15 G(peci\214ed)-2.951 E 2.5(redirections. The)144 661.2 R
(return status is zero.)2.5 E F1(.)110.5 678 Q F2(\214lename)6.666 E F0
([)2.5 E F2(ar)A(guments)-.37 E F0(])A F1(sour)108 690 Q(ce)-.18 E F2
(\214lename)2.5 E F0([)2.5 E F2(ar)A(guments)-.37 E F0(])A 1.02
(Read and e)144 702 R -.15(xe)-.15 G 1.02(cute commands from).15 F F2
(\214lename)5.43 E F0 1.02(in the current shell en)3.7 F 1.02
(vironment and return the e)-.4 F(xit)-.15 E 1.331
(status of the last command e)144 714 R -.15(xe)-.15 G 1.331(cuted from)
.15 F F2(\214lename)5.741 E F0 6.331(.I).18 G(f)-6.331 E F2(\214lename)
5.741 E F0 1.33(does not contain a slash, \214le-)4.011 F .488(names in)
144 726 R/F4 9/Times-Bold@0 SF -.666(PA)2.988 G(TH)-.189 E F0 .488
(are used to \214nd the directory containing)2.738 F F2(\214lename)4.899
E F0 5.489(.T).18 G .489(he \214le searched for in)-5.489 F F4 -.666(PA)
2.989 G(TH)-.189 E F0(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E
(56)190.395 E 0 Cg EP
%%Page: 57 57
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .833
(need not be e)144 84 R -.15(xe)-.15 G 3.333(cutable. When).15 F/F1 10
/Times-Bold@0 SF(bash)3.333 E F0 .832(is not in)3.333 F/F2 10
/Times-Italic@0 SF .832(posix mode)3.332 F F0 3.332(,t)C .832
(he current directory is searched if no)-3.332 F .981
(\214le is found in)144 96 R/F3 9/Times-Bold@0 SF -.666(PA)3.481 G(TH)
-.189 E/F4 9/Times-Roman@0 SF(.)A F0 .981(If the)5.481 F F1(sour)3.481 E
(cepath)-.18 E F0 .981(option to the)3.481 F F1(shopt)3.481 E F0 -.2(bu)
3.481 G .981(iltin command is turned of).2 F .982(f, the)-.25 F F3 -.666
(PA)144 108 S(TH)-.189 E F0 .112(is not searched.)2.363 F .112(If an)
5.112 F(y)-.15 E F2(ar)2.612 E(guments)-.37 E F0 .112(are supplied, the)
2.612 F 2.612(yb)-.15 G .112(ecome the positional parameters when)-2.612
F F2(\214lename)144 120 Q F0 .485(is e)2.985 F -.15(xe)-.15 G 2.985
(cuted. Otherwise).15 F .485(the positional parameters are unchanged.)
2.985 F .485(If the)5.485 F F1<ad54>2.985 E F0 .485(option is en-)2.985
F(abled,)144 132 Q F1(sour)3.325 E(ce)-.18 E F0 .825(inherits an)3.325 F
3.325(yt)-.15 G .825(rap on)-3.325 F F1(DEB)3.325 E(UG)-.1 E F0 3.325
(;i)C 3.325(fi)-3.325 G 3.324(ti)-3.325 G 3.324(sn)-3.324 G .824(ot, an)
-3.324 F(y)-.15 E F1(DEB)3.324 E(UG)-.1 E F0 .824(trap string is sa)
3.324 F -.15(ve)-.2 G 3.324(da).15 G .824(nd re-)-3.324 F .817
(stored around the call to)144 144 R F1(sour)3.317 E(ce)-.18 E F0 3.317
(,a)C(nd)-3.317 E F1(sour)3.317 E(ce)-.18 E F0 .817(unsets the)3.317 F
F1(DEB)3.317 E(UG)-.1 E F0 .817(trap while it e)3.317 F -.15(xe)-.15 G
3.317(cutes. If).15 F F1<ad54>3.317 E F0(is)3.318 E 1.435
(not set, and the sourced \214le changes the)144 156 R F1(DEB)3.935 E
(UG)-.1 E F0 1.435(trap, the ne)3.935 F 3.935(wv)-.25 G 1.435
(alue is retained when)-4.185 F F1(sour)3.935 E(ce)-.18 E F0 3.762
(completes. The)144 168 R 1.262
(return status is the status of the last command e)3.762 F 1.263
(xited within the script \(0 if no)-.15 F(commands are e)144 180 Q -.15
(xe)-.15 G(cuted\), and f).15 E(alse if)-.1 E F2(\214lename)4.41 E F0
(is not found or cannot be read.)2.68 E F1(alias)108 196.8 Q F0([)2.5 E
F1<ad70>A F0 2.5(][)C F2(name)-2.5 E F0([=)A F2(value)A F0 2.5(].)C(..])
-2.5 E F1(Alias)144 208.8 Q F0 2.725(with no ar)5.225 F 2.724
(guments or with the)-.18 F F1<ad70>5.224 E F0 2.724
(option prints the list of aliases in the form)5.224 F F1(alias)5.224 E
F2(name)144 220.8 Q F0(=)A F2(value)A F0 .58(on standard output.)3.08 F
.58(When ar)5.58 F .58
(guments are supplied, an alias is de\214ned for each)-.18 F F2(name)
3.08 E F0(whose)144 232.8 Q F2(value)2.509 E F0 .009(is gi)2.509 F -.15
(ve)-.25 G 2.509(n. A).15 F .009(trailing space in)2.509 F F2(value)
2.509 E F0 .009(causes the ne)2.509 F .009(xt w)-.15 F .009
(ord to be check)-.1 F .008(ed for alias substi-)-.1 F .579
(tution when the alias is e)144 244.8 R 3.079(xpanded. F)-.15 F .579
(or each)-.15 F F2(name)3.079 E F0 .579(in the ar)3.079 F .579
(gument list for which no)-.18 F F2(value)3.079 E F0 .579(is sup-)3.079
F 1.314(plied, the name and v)144 256.8 R 1.314
(alue of the alias is printed.)-.25 F F1(Alias)6.314 E F0 1.314
(returns true unless a)3.814 F F2(name)3.814 E F0 1.313(is gi)3.814 F
-.15(ve)-.25 G 3.813(nf).15 G(or)-3.813 E
(which no alias has been de\214ned.)144 268.8 Q F1(bg)108 285.6 Q F0([)
2.5 E F2(jobspec)A F0(...])2.5 E .744(Resume each suspended job)144
297.6 R F2(jobspec)3.244 E F0 .745
(in the background, as if it had been started with)3.244 F F1(&)3.245 E
F0 5.745(.I)C(f)-5.745 E F2(job-)4.985 E(spec)144 309.6 Q F0 .672
(is not present, the shell')3.482 F 3.172(sn)-.55 G .672(otion of the)
-3.172 F F2(curr)3.172 E .672(ent job)-.37 F F0 .672(is used.)3.172 F F1
(bg)5.671 E F2(jobspec)4.911 E F0 .671(returns 0 unless run)3.481 F .418
(when job control is disabled or)144 321.6 R 2.919(,w)-.4 G .419
(hen run with job control enabled, an)-2.919 F 2.919(ys)-.15 G
(peci\214ed)-2.919 E F2(jobspec)2.919 E F0 -.1(wa)2.919 G 2.919(sn).1 G
(ot)-2.919 E(found or w)144 333.6 Q(as started without job control.)-.1
E F1(bind)108 350.4 Q F0([)2.5 E F1<ad6d>A F2 -.1(ke)2.5 G(ymap)-.2 E F0
2.5(][)C F1(\255lpsvPSVX)-2.5 E F0(])A F1(bind)108 362.4 Q F0([)2.5 E F1
<ad6d>A F2 -.1(ke)2.5 G(ymap)-.2 E F0 2.5(][)C F1<ad71>-2.5 E F2
(function)2.5 E F0 2.5(][)C F1<ad75>-2.5 E F2(function)2.5 E F0 2.5(][)C
F1<ad72>-2.5 E F2 -.1(ke)2.5 G(yseq)-.2 E F0(])A F1(bind)108 374.4 Q F0
([)2.5 E F1<ad6d>A F2 -.1(ke)2.5 G(ymap)-.2 E F0(])A F1<ad66>2.5 E F2
(\214lename)2.5 E F1(bind)108 386.4 Q F0([)2.5 E F1<ad6d>A F2 -.1(ke)2.5
G(ymap)-.2 E F0(])A F1<ad78>2.5 E F2 -.1(ke)2.5 G(yseq)-.2 E F0(:)A F2
(shell\255command)A F1(bind)108 398.4 Q F0([)2.5 E F1<ad6d>A F2 -.1(ke)
2.5 G(ymap)-.2 E F0(])A F2 -.1(ke)2.5 G(yseq)-.2 E F0(:)A F2
(function\255name)A F1(bind)108 410.4 Q F0([)2.5 E F1<ad6d>A F2 -.1(ke)
2.5 G(ymap)-.2 E F0(])A F2 -.1(ke)2.5 G(yseq)-.2 E F0(:)A F2 -.37(re)C
(adline\255command).37 E F0 .239(Display current)144 422.4 R F1 -.18(re)
2.739 G(adline).18 E F0 -.1(ke)2.739 G 2.739(ya)-.05 G .239
(nd function bindings, bind a k)-2.739 F .539 -.15(ey s)-.1 H .238
(equence to a).15 F F1 -.18(re)2.738 G(adline).18 E F0 .238(function or)
2.738 F .475(macro, or set a)144 434.4 R F1 -.18(re)2.975 G(adline).18 E
F0 -.25(va)2.975 G 2.975(riable. Each).25 F .476(non-option ar)2.976 F
.476(gument is a command as it w)-.18 F .476(ould appear in)-.1 F F2
(.inputr)144.23 446.4 Q(c)-.37 E F0 2.968(,b).31 G .467
(ut each binding or command must be passed as a separate ar)-3.168 F
.467(gument; e.g., '"\\C\255x\\C\255r":)-.18 F 2.5
(re\255read\255init\255\214le'. Options,)144 458.4 R(if supplied, ha)2.5
E .3 -.15(ve t)-.2 H(he follo).15 E(wing meanings:)-.25 E F1<ad6d>144
470.4 Q F2 -.1(ke)2.5 G(ymap)-.2 E F0(Use)180 482.4 Q F2 -.1(ke)5.158 G
(ymap)-.2 E F0 2.658(as the k)5.348 F -.15(ey)-.1 G 2.658(map to be af)
.15 F 2.659(fected by the subsequent bindings.)-.25 F(Acceptable)7.659 E
F2 -.1(ke)180 494.4 S(ymap)-.2 E F0 3.193(names are)5.883 F F2 3.193
(emacs, emacs\255standar)5.693 F 3.192
(d, emacs\255meta, emacs\255ctlx, vi, vi\255mo)-.37 F(ve)-.1 E(,)-.1 E
(vi\255command)180 506.4 Q F0 4.089(,a)C(nd)-4.089 E F2(vi\255insert)
4.379 E F0(.).68 E F2(vi)6.589 E F0 1.589(is equi)4.089 F -.25(va)-.25 G
1.589(lent to).25 F F2(vi\255command)4.089 E F0(\()4.089 E F2(vi\255mo)A
(ve)-.1 E F0 1.59(is also a syn-)4.089 F(on)180 518.4 Q(ym\);)-.15 E F2
(emacs)2.5 E F0(is equi)2.5 E -.25(va)-.25 G(lent to).25 E F2
(emacs\255standar)2.5 E(d)-.37 E F0(.)A F1<ad6c>144 530.4 Q F0
(List the names of all)180 530.4 Q F1 -.18(re)2.5 G(adline).18 E F0
(functions.)2.5 E F1<ad70>144 542.4 Q F0(Display)180 542.4 Q F1 -.18(re)
2.5 G(adline).18 E F0(function names and bindings in such a w)2.5 E
(ay that the)-.1 E 2.5(yc)-.15 G(an be re-read.)-2.5 E F1<ad50>144 554.4
Q F0(List current)180 554.4 Q F1 -.18(re)2.5 G(adline).18 E F0
(function names and bindings.)2.5 E F1<ad73>144 566.4 Q F0(Display)180
566.4 Q F1 -.18(re)3.655 G(adline).18 E F0 -.1(ke)3.655 G 3.655(ys)-.05
G 1.155(equences bound to macros and the strings the)-3.655 F 3.655(yo)
-.15 G 1.155(utput in such a)-3.655 F -.1(wa)180 578.4 S 2.5(yt).1 G
(hat the)-2.5 E 2.5(yc)-.15 G(an be re-read.)-2.5 E F1<ad53>144 590.4 Q
F0(Display)180 590.4 Q F1 -.18(re)2.5 G(adline).18 E F0 -.1(ke)2.5 G 2.5
(ys)-.05 G(equences bound to macros and the strings the)-2.5 E 2.5(yo)
-.15 G(utput.)-2.5 E F1<ad76>144 602.4 Q F0(Display)180 602.4 Q F1 -.18
(re)2.5 G(adline).18 E F0 -.25(va)2.5 G(riable names and v).25 E
(alues in such a w)-.25 E(ay that the)-.1 E 2.5(yc)-.15 G
(an be re-read.)-2.5 E F1<ad56>144 614.4 Q F0(List current)180 614.4 Q
F1 -.18(re)2.5 G(adline).18 E F0 -.25(va)2.5 G(riable names and v).25 E
(alues.)-.25 E F1<ad66>144 626.4 Q F2(\214lename)2.5 E F0(Read k)180
638.4 Q .3 -.15(ey b)-.1 H(indings from).15 E F2(\214lename)2.5 E F0(.)A
F1<ad71>144 650.4 Q F2(function)2.5 E F0(Query about which k)180 662.4 Q
-.15(ey)-.1 G 2.5(si).15 G -1.9 -.4(nv o)-2.5 H .2 -.1(ke t).4 H
(he named).1 E F2(function)2.5 E F0(.)A F1<ad75>144 674.4 Q F2(function)
2.5 E F0(Unbind all k)180 686.4 Q -.15(ey)-.1 G 2.5(sb).15 G
(ound to the named)-2.5 E F2(function)2.5 E F0(.)A F1<ad72>144 698.4 Q
F2 -.1(ke)2.5 G(yseq)-.2 E F0(Remo)180 710.4 Q .3 -.15(ve a)-.15 H .3
-.15(ny c).15 H(urrent binding for).15 E F2 -.1(ke)2.5 G(yseq)-.2 E F0
(.)A(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(57)190.395 E 0 Cg
EP
%%Page: 58 58
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF<ad78>144 84 Q/F2 10/Times-Italic@0 SF -.1(ke)2.5 G(yseq)-.2 E F1(:)A
F2(shell\255command)A F0(Cause)180 96 Q F2(shell\255command)4.325 E F0
1.825(to be e)4.325 F -.15(xe)-.15 G 1.825(cuted whene).15 F -.15(ve)
-.25 G(r).15 E F2 -.1(ke)4.325 G(yseq)-.2 E F0 1.825(is entered.)4.325 F
(When)6.825 E F2(shell\255com-)4.325 E(mand)180 108 Q F0 1.765(is e)
4.265 F -.15(xe)-.15 G 1.765(cuted, the shell sets the).15 F/F3 9
/Times-Bold@0 SF(READLINE_LINE)4.265 E F0 -.25(va)4.015 G 1.765
(riable to the contents of the).25 F F1 -.18(re)180 120 S(adline).18 E
F0 .375(line b)2.874 F(uf)-.2 E .375(fer and the)-.25 F F3
(READLINE_POINT)2.875 E F0(and)2.625 E F3(READLINE_MARK)2.875 E F0 -.25
(va)2.625 G .375(riables to the).25 F 1.186
(current location of the insertion point and the sa)180 132 R -.15(ve)
-.2 G 3.685(di).15 G 1.185(nsertion point \(the mark\), respec-)-3.685 F
(ti)180 144 Q -.15(ve)-.25 G(ly).15 E 5.701(.I)-.65 G 3.201(ft)-5.701 G
.701(he e)-3.201 F -.15(xe)-.15 G .701(cuted command changes the v).15 F
.702(alue of an)-.25 F 3.202(yo)-.15 G(f)-3.202 E F3(READLINE_LINE)3.202
E/F4 9/Times-Roman@0 SF(,)A F3(READ-)2.952 E(LINE_POINT)180 156 Q F4(,)A
F0(or)3.581 E F3(READLINE_MARK)3.831 E F4(,)A F0 1.331(those ne)3.581 F
3.831(wv)-.25 G 1.33(alues will be re\215ected in the editing)-4.081 F
(state.)180 168 Q F1<ad58>144 180 Q F0 .829(List all k)180 180 R 1.129
-.15(ey s)-.1 H .829
(equences bound to shell commands and the associated commands in a for)
.15 F(-)-.2 E(mat that can be reused as input.)180 192 Q(The return v)
144 208.8 Q(alue is 0 unless an unrecognized option is gi)-.25 E -.15
(ve)-.25 G 2.5(no).15 G 2.5(ra)-2.5 G 2.5(ne)-2.5 G(rror occurred.)-2.5
E F1(br)108 225.6 Q(eak)-.18 E F0([)2.5 E F2(n)A F0(])A .055
(Exit from within a)144 237.6 R F1 -.25(fo)2.555 G(r).25 E F0(,)A F1
(while)2.555 E F0(,)A F1(until)2.555 E F0 2.555(,o)C(r)-2.555 E F1
(select)2.555 E F0 2.555(loop. If)2.555 F F2(n)2.555 E F0 .055
(is speci\214ed, break)2.555 F F2(n)2.555 E F0(le)2.555 E -.15(ve)-.25 G
(ls.).15 E F2(n)5.414 E F0 .054(must be)2.794 F/F5 10/Symbol SF<b3>2.554
E F0(1.)2.554 E(If)144 249.6 Q F2(n)3.074 E F0 .215(is greater than the\
 number of enclosing loops, all enclosing loops are e)2.954 F 2.715
(xited. The)-.15 F .215(return v)2.715 F(alue)-.25 E(is 0 unless)144
261.6 Q F2(n)2.5 E F0(is not greater than or equal to 1.)2.5 E F1 -.2
(bu)108 278.4 S(iltin).2 E F2(shell\255b)2.5 E(uiltin)-.2 E F0([)2.5 E
F2(ar)A(guments)-.37 E F0(])A(Ex)144 290.4 Q .771
(ecute the speci\214ed shell b)-.15 F .771(uiltin, passing it)-.2 F F2
(ar)3.601 E(guments)-.37 E F0 3.271(,a).27 G .771(nd return its e)-3.271
F .77(xit status.)-.15 F .77(This is useful)5.77 F .615
(when de\214ning a function whose name is the same as a shell b)144
302.4 R .616(uiltin, retaining the functionality of)-.2 F .57(the b)144
314.4 R .57(uiltin within the function.)-.2 F(The)5.57 E F1(cd)3.07 E F0
-.2(bu)3.07 G .57(iltin is commonly rede\214ned this w).2 F(ay)-.1 E
5.57(.T)-.65 G .57(he return status)-5.57 F(is f)144 326.4 Q(alse if)-.1
E F2(shell\255b)2.84 E(uiltin)-.2 E F0(is not a shell b)2.74 E
(uiltin command.)-.2 E F1(caller)108 343.2 Q F0([)2.5 E F2 -.2(ex)C(pr)
.2 E F0(])A .253(Returns the conte)144 355.2 R .254(xt of an)-.15 F
2.754(ya)-.15 G(cti)-2.754 E .554 -.15(ve s)-.25 H .254
(ubroutine call \(a shell function or a script e).15 F -.15(xe)-.15 G
.254(cuted with the).15 F F1(.)2.754 E F0(or)2.754 E F1(sour)144 367.2 Q
(ce)-.18 E F0 -.2(bu)2.825 G 2.825(iltins\). W).2 F(ithout)-.4 E F2 -.2
(ex)2.825 G(pr).2 E F0(,)A F1(caller)2.825 E F0 .324
(displays the line number and source \214lename of the current)2.824 F
.253(subroutine call.)144 379.2 R .253(If a non-ne)5.253 F -.05(ga)-.15
G(ti).05 E .553 -.15(ve i)-.25 H(nte).15 E .253(ger is supplied as)-.15
F F2 -.2(ex)2.753 G(pr).2 E F0(,)A F1(caller)2.753 E F0 .254
(displays the line number)2.754 F 2.754(,s)-.4 G(ub-)-2.754 E 1.327(rou\
tine name, and source \214le corresponding to that position in the curr\
ent e)144 391.2 R -.15(xe)-.15 G 1.327(cution call stack.).15 F(This e)
144 403.2 Q(xtra information may be used, for e)-.15 E .001
(xample, to print a stack trace.)-.15 F .001(The current frame is frame)
5.001 F 3.02(0. The)144 415.2 R .52(return v)3.02 F .52
(alue is 0 unless the shell is not e)-.25 F -.15(xe)-.15 G .519
(cuting a subroutine call or).15 F F2 -.2(ex)3.019 G(pr).2 E F0 .519
(does not corre-)3.019 F(spond to a v)144 427.2 Q
(alid position in the call stack.)-.25 E F1(cd)108 444 Q F0([)2.5 E F1
<ad4c>A F0(|[)A F1<ad50>A F0([)2.5 E F1<ad65>A F0(]] [\255@]] [)A F2
(dir)A F0(])A .321(Change the current directory to)144 456 R F2(dir)
2.821 E F0 5.321(.i)C(f)-5.321 E F2(dir)2.821 E F0 .322
(is not supplied, the v)2.821 F .322(alue of the)-.25 F F3(HOME)2.822 E
F0 .322(shell v)2.572 F .322(ariable is)-.25 F 1.036(the def)144 468 R
3.536(ault. An)-.1 F 3.536(ya)-.15 G 1.035(dditional ar)-3.536 F 1.035
(guments follo)-.18 F(wing)-.25 E F2(dir)3.535 E F0 1.035(are ignored.)
3.535 F 1.035(The v)6.035 F(ariable)-.25 E F3(CDP)3.535 E -.855(AT)-.666
G(H).855 E F0(de\214nes)3.285 E .826
(the search path for the directory containing)144 480 R F2(dir)3.676 E
F0 3.326(:e).73 G .826(ach directory name in)-3.326 F F3(CDP)3.326 E
-.855(AT)-.666 G(H).855 E F0 .827(is searched for)3.077 F F2(dir)144 492
Q F0 5.665(.A)C(lternati)-5.665 E .965 -.15(ve d)-.25 H .665
(irectory names in).15 F F3(CDP)3.165 E -.855(AT)-.666 G(H).855 E F0
.665(are separated by a colon \(:\).)2.915 F 3.165(An)5.665 G .664
(ull directory name)-3.165 F(in)144 504 Q F3(CDP)3.101 E -.855(AT)-.666
G(H).855 E F0 .601(is the same as the current directory)2.851 F 3.102
(,i)-.65 G .602(.e., `)-3.102 F(`)-.74 E F1(.)A F0 -.74('')C 5.602(.I)
.74 G(f)-5.602 E F2(dir)3.452 E F0(be)3.832 E .602
(gins with a slash \(/\), then)-.15 F F3(CD-)3.102 E -.666(PA)144 516 S
(TH)-.189 E F0 1.003(is not used.)3.254 F(The)6.003 E F1<ad50>3.503 E F0
1.003(option causes)3.503 F F1(cd)3.503 E F0 1.003(to use the ph)3.503 F
1.003(ysical directory structure by resolving)-.05 F .123
(symbolic links while tra)144 528 R -.15(ve)-.2 G(rsing).15 E F2(dir)
2.623 E F0 .123(and before processing instances of)2.623 F F2(..)2.623 E
F0(in)2.623 E F2(dir)2.623 E F0 .123(\(see also the)2.623 F F1<ad50>
2.623 E F0(op-)2.623 E .43(tion to the)144 540 R F1(set)2.93 E F0 -.2
(bu)2.93 G .43(iltin command\); the).2 F F1<ad4c>2.929 E F0 .429
(option forces symbolic links to be follo)2.929 F .429(wed by resolving)
-.25 F .472(the link after processing instances of)144 552 R F2(..)2.972
E F0(in)2.972 E F2(dir)2.973 E F0 5.473(.I)C(f)-5.473 E F2(..)2.973 E F0
.473(appears in)2.973 F F2(dir)2.973 E F0 2.973(,i)C 2.973(ti)-2.973 G
2.973(sp)-2.973 G .473(rocessed by remo)-2.973 F .473(ving the)-.15 F
.948(immediately pre)144 564 R .948(vious pathname component from)-.25 F
F2(dir)3.448 E F0 3.448(,b)C .948(ack to a slash or the be)-3.448 F .948
(ginning of)-.15 F F2(dir)3.448 E F0 5.948(.I)C(f)-5.948 E(the)144 576 Q
F1<ad65>2.868 E F0 .368(option is supplied with)2.868 F F1<ad50>2.868 E
F0 2.868(,a)C .368(nd the current w)-2.868 F .368
(orking directory cannot be successfully deter)-.1 F(-)-.2 E .612
(mined after a successful directory change,)144 588 R F1(cd)3.112 E F0
.612(will return an unsuccessful status.)3.112 F .612(On systems that)
5.612 F .353(support it, the)144 600 R F1<ad40>2.853 E F0 .354
(option presents the e)2.853 F .354(xtended attrib)-.15 F .354
(utes associated with a \214le as a directory)-.2 F 5.354(.A)-.65 G(n)
-5.354 E(ar)144 612 Q .072(gument of)-.18 F F1<ad>2.572 E F0 .072
(is con)2.572 F -.15(ve)-.4 G .072(rted to).15 F F3($OLDPWD)2.572 E F0
.072(before the directory change is attempted.)2.322 F .072
(If a non-empty)5.072 F .054(directory name from)144 624 R F3(CDP)2.554
E -.855(AT)-.666 G(H).855 E F0 .054(is used, or if)2.304 F F1<ad>2.555 E
F0 .055(is the \214rst ar)2.555 F .055
(gument, and the directory change is suc-)-.18 F .168
(cessful, the absolute pathname of the ne)144 636 R 2.668(ww)-.25 G .168
(orking directory is written to the standard output.)-2.768 F(The)5.168
E(return v)144 648 Q(alue is true if the directory w)-.25 E
(as successfully changed; f)-.1 E(alse otherwise.)-.1 E F1(command)108
664.8 Q F0([)2.5 E F1(\255pVv)A F0(])A F2(command)2.5 E F0([)2.5 E F2
(ar)A(g)-.37 E F0(...])2.5 E(Run)144 676.8 Q F2(command)2.764 E F0(with)
3.334 E F2(ar)2.894 E(gs)-.37 E F0 .065
(suppressing the normal shell function lookup.)2.834 F .065(Only b)5.065
F .065(uiltin commands or)-.2 F .502(commands found in the)144 688.8 R
F3 -.666(PA)3.002 G(TH)-.189 E F0 .502(are e)2.752 F -.15(xe)-.15 G
3.002(cuted. If).15 F(the)3.002 E F1<ad70>3.002 E F0 .502(option is gi)
3.002 F -.15(ve)-.25 G .501(n, the search for).15 F F2(command)3.201 E
F0(is)3.771 E .399(performed using a def)144 700.8 R .399(ault v)-.1 F
.399(alue for)-.25 F F3 -.666(PA)2.899 G(TH)-.189 E F0 .4
(that is guaranteed to \214nd all of the standard utilities.)2.649 F(If)
5.4 E .175(either the)144 712.8 R F1<ad56>2.675 E F0(or)2.675 E F1<ad76>
2.675 E F0 .175(option is supplied, a description of)2.675 F F2(command)
2.875 E F0 .174(is printed.)3.445 F(The)5.174 E F1<ad76>2.674 E F0 .174
(option causes)2.674 F 3.317(as)144 724.8 S .817(ingle w)-3.317 F .817
(ord indicating the command or \214lename used to in)-.1 F -.2(vo)-.4 G
-.1(ke).2 G F2(command)3.618 E F0 .818(to be displayed; the)4.088 F
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(58)190.395 E 0 Cg EP
%%Page: 59 59
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF<ad56>144 84 Q F0 .25(option produces a more v)2.75 F .25
(erbose description.)-.15 F .249(If the)5.25 F F1<ad56>2.749 E F0(or)
2.749 E F1<ad76>2.749 E F0 .249(option is supplied, the e)2.749 F .249
(xit status)-.15 F 1.004(is 0 if)144 96 R/F2 10/Times-Italic@0 SF
(command)3.704 E F0 -.1(wa)4.274 G 3.504(sf).1 G 1.005
(ound, and 1 if not.)-3.504 F 1.005
(If neither option is supplied and an error occurred or)6.005 F F2
(command)144.2 108 Q F0 1.599(cannot be found, the e)4.869 F 1.599
(xit status is 127.)-.15 F 1.599(Otherwise, the e)6.599 F 1.598
(xit status of the)-.15 F F1(command)4.098 E F0 -.2(bu)144 120 S
(iltin is the e).2 E(xit status of)-.15 E F2(command)2.7 E F0(.).77 E F1
(compgen)108 136.8 Q F0([)2.5 E F2(option)A F0 2.5(][)C F2(wor)-2.5 E(d)
-.37 E F0(])A .012(Generate possible completion matches for)144 148.8 R
F2(wor)2.513 E(d)-.37 E F0 .013(according to the)2.513 F F2(option)2.513
E F0 .013(s, which may be an)B 2.513(yo)-.15 G(ption)-2.513 E .982
(accepted by the)144 160.8 R F1(complete)3.482 E F0 -.2(bu)3.481 G .981
(iltin with the e).2 F .981(xception of)-.15 F F1<ad70>3.481 E F0(and)
3.481 E F1<ad72>3.481 E F0 3.481(,a)C .981(nd write the matches to the)
-3.481 F .13(standard output.)144 172.8 R .13(When using the)5.13 F F1
<ad46>2.63 E F0(or)2.63 E F1<ad43>2.631 E F0 .131(options, the v)2.631 F
.131(arious shell v)-.25 F .131(ariables set by the program-)-.25 F
(mable completion f)144 184.8 Q(acilities, while a)-.1 E -.25(va)-.2 G
(ilable, will not ha).25 E .3 -.15(ve u)-.2 H(seful v).15 E(alues.)-.25
E .352(The matches will be generated in the same w)144 208.8 R .352
(ay as if the programmable completion code had gen-)-.1 F .02(erated th\
em directly from a completion speci\214cation with the same \215ags.)144
220.8 R(If)5.02 E F2(wor)2.52 E(d)-.37 E F0 .02(is speci\214ed, only)
2.52 F(those completions matching)144 232.8 Q F2(wor)2.5 E(d)-.37 E F0
(will be displayed.)2.5 E(The return v)144 256.8 Q
(alue is true unless an in)-.25 E -.25(va)-.4 G
(lid option is supplied, or no matches were generated.).25 E F1
(complete)108 273.6 Q F0([)2.5 E F1(\255abcdefgjksuv)A F0 2.5(][)C F1
<ad6f>-2.5 E F2(comp-option)2.5 E F0 2.5(][)C F1(\255DEI)-2.5 E F0 2.5
(][)C F1<ad41>-2.5 E F2(action)2.5 E F0 2.5(][)C F1<ad47>-2.5 E F2
(globpat)2.5 E F0 2.5(][)C F1<ad57>-2.5 E F2(wor)2.5 E(dlist)-.37 E F0
(])A([)144 285.6 Q F1<ad46>A F2(function)2.5 E F0 2.5(][)C F1<ad43>-2.5
E F2(command)2.5 E F0 2.5(][)C F1<ad58>-2.5 E F2(\214lterpat)2.5 E F0
2.5(][)C F1<ad50>-2.5 E F2(pr)2.5 E(e\214x)-.37 E F0 2.5(][)C F1<ad53>
-2.5 E F2(suf)2.5 E<8c78>-.18 E F0(])A F2(name)2.5 E F0([)2.5 E F2
(name ...)A F0(])A F1(complete \255pr)108 297.6 Q F0([)2.5 E F1(\255DEI)
A F0 2.5(][)C F2(name)-2.5 E F0(...])2.5 E .634(Specify ho)144 309.6 R
3.134(wa)-.25 G -.18(rg)-3.134 G .634(uments to each).18 F F2(name)3.134
E F0 .634(should be completed.)3.134 F .633(If the)5.634 F F1<ad70>3.133
E F0 .633(option is supplied, or if no)3.133 F .139
(options are supplied, e)144 321.6 R .139
(xisting completion speci\214cations are printed in a w)-.15 F .14
(ay that allo)-.1 F .14(ws them to be)-.25 F .31(reused as input.)144
333.6 R(The)5.31 E F1<ad72>2.81 E F0 .31(option remo)2.81 F -.15(ve)-.15
G 2.81(sac).15 G .31(ompletion speci\214cation for each)-2.81 F F2(name)
2.81 E F0 2.81(,o)C 1.11 -.4(r, i)-2.81 H 2.81(fn).4 G(o)-2.81 E F2
(name)2.81 E F0(s)A 1.207
(are supplied, all completion speci\214cations.)144 345.6 R(The)6.207 E
F1<ad44>3.707 E F0 1.208(option indicates that other supplied options)
3.708 F .5(and actions should apply to the `)144 357.6 R(`def)-.74 E
(ault')-.1 E 3('c)-.74 G .5
(ommand completion; that is, completion attempted on)-3 F 3.455(ac)144
369.6 S .955(ommand for which no completion has pre)-3.455 F .955
(viously been de\214ned.)-.25 F(The)5.955 E F1<ad45>3.455 E F0 .955
(option indicates that)3.455 F .876
(other supplied options and actions should apply to `)144 381.6 R
(`empty')-.74 E 3.376('c)-.74 G .876(ommand completion; that is, com-)
-3.376 F .447(pletion attempted on a blank line.)144 393.6 R(The)5.447 E
F1<ad49>2.947 E F0 .448
(option indicates that other supplied options and actions)2.947 F .123
(should apply to completion on the initial non-assignment w)144 405.6 R
.123(ord on the line, or after a command de-)-.1 F 1.02(limiter such as)
144 417.6 R F1(;)3.52 E F0(or)3.52 E F1(|)3.52 E F0 3.52(,w)C 1.021
(hich is usually command name completion.)-3.52 F 1.021
(If multiple options are sup-)6.021 F .708(plied, the)144 429.6 R F1
<ad44>3.208 E F0 .708(option tak)3.208 F .708(es precedence o)-.1 F -.15
(ve)-.15 G(r).15 E F1<ad45>3.208 E F0 3.208(,a)C .708(nd both tak)-3.208
F 3.208(ep)-.1 G .707(recedence o)-3.208 F -.15(ve)-.15 G(r).15 E F1
<ad49>3.207 E F0 5.707(.I)C 3.207(fa)-5.707 G 1.007 -.15(ny o)-3.207 H
(f).15 E F1<ad44>3.207 E F0(,)A F1<ad45>144 441.6 Q F0 2.603(,o)C(r)
-2.603 E F1<ad49>2.603 E F0 .103(are supplied, an)2.603 F 2.603(yo)-.15
G(ther)-2.603 E F2(name)2.603 E F0(ar)2.603 E .103
(guments are ignored; these completions only apply to the)-.18 F
(case speci\214ed by the option.)144 453.6 Q .153
(The process of applying these completion speci\214cations when w)144
477.6 R .152(ord completion is attempted is de-)-.1 F(scribed abo)144
489.6 Q .3 -.15(ve u)-.15 H(nder).15 E F1(Pr)2.5 E
(ogrammable Completion)-.18 E F0(.)A .555
(Other options, if speci\214ed, ha)144 513.6 R .855 -.15(ve t)-.2 H .555
(he follo).15 F .555(wing meanings.)-.25 F .555(The ar)5.555 F .555
(guments to the)-.18 F F1<ad47>3.056 E F0(,)A F1<ad57>3.056 E F0 3.056
(,a)C(nd)-3.056 E F1<ad58>3.056 E F0 .723(options \(and, if necessary)
144 525.6 R 3.223(,t)-.65 G(he)-3.223 E F1<ad50>3.223 E F0(and)3.223 E
F1<ad53>3.223 E F0 .722
(options\) should be quoted to protect them from e)3.223 F(xpan-)-.15 E
(sion before the)144 537.6 Q F1(complete)2.5 E F0 -.2(bu)2.5 G
(iltin is in).2 E -.2(vo)-.4 G -.1(ke).2 G(d.).1 E F1<ad6f>144 549.6 Q
F2(comp-option)2.5 E F0(The)184 561.6 Q F2(comp-option)2.79 E F0 .291
(controls se)2.791 F -.15(ve)-.25 G .291(ral aspects of the compspec')
.15 F 2.791(sb)-.55 G(eha)-2.791 E .291(vior be)-.2 F .291
(yond the simple)-.15 F(generation of completions.)184 573.6 Q F2
(comp-option)5 E F0(may be one of:)2.5 E F1(bashdefault)184 585.6 Q F0
.281(Perform the rest of the def)224 597.6 R(ault)-.1 E F1(bash)2.781 E
F0 .281(completions if the compspec generates no)2.781 F(matches.)224
609.6 Q F1(default)184 621.6 Q F0 2.875(Use readline')224 621.6 R 5.375
(sd)-.55 G(ef)-5.375 E 2.876
(ault \214lename completion if the compspec generates no)-.1 F(matches.)
224 633.6 Q F1(dir)184 645.6 Q(names)-.15 E F0(Perform directory name c\
ompletion if the compspec generates no matches.)224 657.6 Q F1
(\214lenames)184 669.6 Q F0 -.7(Te)224 681.6 S .137(ll readline that th\
e compspec generates \214lenames, so it can perform an).7 F 2.636<798c>
-.15 G(le-)-2.636 E .134(name\255speci\214c processing \(lik)224 693.6 R
2.634(ea)-.1 G .134(dding a slash to directory names, quoting spe-)
-2.634 F .45(cial characters, or suppressing trailing spaces\).)224
705.6 R .45(Intended to be used with shell)5.45 F(functions.)224 717.6 Q
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(59)190.395 E 0 Cg EP
%%Page: 60 60
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(noquote)184 84 Q F0 -.7(Te)224 84 S .814
(ll readline not to quote the completed w).7 F .814(ords if the)-.1 F
3.314(ya)-.15 G .815(re \214lenames \(quoting)-3.314 F
(\214lenames is the def)224 96 Q(ault\).)-.1 E F1(nosort)184 108 Q F0
-.7(Te)224 108 S(ll readline not to sort the list of possible completio\
ns alphabetically).7 E(.)-.65 E F1(nospace)184 120 Q F0 -.7(Te)224 120 S
.22(ll readline not to append a space \(the def).7 F .22(ault\) to w)-.1
F .22(ords completed at the end)-.1 F(of the line.)224 132 Q F1
(plusdirs)184 144 Q F0 1.985(After an)224 144 R 4.485(ym)-.15 G 1.985
(atches de\214ned by the compspec are generated, directory name)-4.485 F
.584(completion is attempted and an)224 156 R 3.084(ym)-.15 G .584
(atches are added to the results of the other)-3.084 F(actions.)224 168
Q F1<ad41>144 180 Q/F2 10/Times-Italic@0 SF(action)2.5 E F0(The)184 192
Q F2(action)2.5 E F0(may be one of the follo)2.5 E
(wing to generate a list of possible completions:)-.25 E F1(alias)184
204 Q F0(Alias names.)224 204 Q(May also be speci\214ed as)5 E F1<ad61>
2.5 E F0(.)A F1(arrayv)184 216 Q(ar)-.1 E F0(Array v)224 228 Q
(ariable names.)-.25 E F1(binding)184 240 Q(Readline)224 240 Q F0 -.1
(ke)2.5 G 2.5(yb)-.05 G(inding names.)-2.5 E F1 -.2(bu)184 252 S(iltin)
.2 E F0(Names of shell b)224 252 Q(uiltin commands.)-.2 E
(May also be speci\214ed as)5 E F1<ad62>2.5 E F0(.)A F1(command)184 264
Q F0(Command names.)224 276 Q(May also be speci\214ed as)5 E F1<ad63>2.5
E F0(.)A F1(dir)184 288 Q(ectory)-.18 E F0(Directory names.)224 300 Q
(May also be speci\214ed as)5 E F1<ad64>2.5 E F0(.)A F1(disabled)184 312
Q F0(Names of disabled shell b)224 324 Q(uiltins.)-.2 E F1(enabled)184
336 Q F0(Names of enabled shell b)224 336 Q(uiltins.)-.2 E F1(export)184
348 Q F0(Names of e)224 348 Q(xported shell v)-.15 E 2.5(ariables. May)
-.25 F(also be speci\214ed as)2.5 E F1<ad65>2.5 E F0(.)A F1(\214le)184
360 Q F0(File names.)224 360 Q(May also be speci\214ed as)5 E F1<ad66>
2.5 E F0(.)A F1(function)184 372 Q F0(Names of shell functions.)224 384
Q F1(gr)184 396 Q(oup)-.18 E F0(Group names.)224 396 Q
(May also be speci\214ed as)5 E F1<ad67>2.5 E F0(.)A F1(helptopic)184
408 Q F0(Help topics as accepted by the)224 420 Q F1(help)2.5 E F0 -.2
(bu)2.5 G(iltin.).2 E F1(hostname)184 432 Q F0(Hostnames, as tak)224 444
Q(en from the \214le speci\214ed by the)-.1 E/F3 9/Times-Bold@0 SF
(HOSTFILE)2.5 E F0(shell v)2.25 E(ariable.)-.25 E F1(job)184 456 Q F0
(Job names, if job control is acti)224 456 Q -.15(ve)-.25 G 5(.M).15 G
(ay also be speci\214ed as)-5 E F1<ad6a>2.5 E F0(.)A F1 -.1(ke)184 468 S
(yw).1 E(ord)-.1 E F0(Shell reserv)224 480 Q(ed w)-.15 E 2.5(ords. May)
-.1 F(also be speci\214ed as)2.5 E F1<ad6b>2.5 E F0(.)A F1(running)184
492 Q F0(Names of running jobs, if job control is acti)224 492 Q -.15
(ve)-.25 G(.).15 E F1(ser)184 504 Q(vice)-.1 E F0(Service names.)224 504
Q(May also be speci\214ed as)5 E F1<ad73>2.5 E F0(.)A F1(setopt)184 516
Q F0 -1.11(Va)224 516 S(lid ar)1.11 E(guments for the)-.18 E F1<ad6f>2.5
E F0(option to the)2.5 E F1(set)2.5 E F0 -.2(bu)2.5 G(iltin.).2 E F1
(shopt)184 528 Q F0(Shell option names as accepted by the)224 528 Q F1
(shopt)2.5 E F0 -.2(bu)2.5 G(iltin.).2 E F1(signal)184 540 Q F0
(Signal names.)224 540 Q F1(stopped)184 552 Q F0
(Names of stopped jobs, if job control is acti)224 552 Q -.15(ve)-.25 G
(.).15 E F1(user)184 564 Q F0(User names.)224 564 Q
(May also be speci\214ed as)5 E F1<ad75>2.5 E F0(.)A F1 -.1(va)184 576 S
(riable).1 E F0(Names of all shell v)224 576 Q 2.5(ariables. May)-.25 F
(also be speci\214ed as)2.5 E F1<ad76>2.5 E F0(.)A F1<ad43>144 588 Q F2
(command)2.5 E(command)184 600 Q F0 1.055(is e)3.555 F -.15(xe)-.15 G
1.055(cuted in a subshell en).15 F 1.056
(vironment, and its output is used as the possible)-.4 F(completions.)
184 612 Q F1<ad46>144 624 Q F2(function)2.5 E F0 .114
(The shell function)184 636 R F2(function)2.614 E F0 .114(is e)2.614 F
-.15(xe)-.15 G .114(cuted in the current shell en).15 F 2.614
(vironment. When)-.4 F .113(the func-)2.613 F .816(tion is e)184 648 R
-.15(xe)-.15 G .816(cuted, the \214rst ar).15 F .816(gument \()-.18 F F1
($1)A F0 3.316(\)i)C 3.316(st)-3.316 G .817
(he name of the command whose ar)-3.316 F(guments)-.18 E 1.407
(are being completed, the second ar)184 660 R 1.407(gument \()-.18 F F1
($2)A F0 3.907(\)i)C 3.907(st)-3.907 G 1.407(he w)-3.907 F 1.407
(ord being completed, and the)-.1 F .103(third ar)184 672 R .103
(gument \()-.18 F F1($3)A F0 2.603(\)i)C 2.603(st)-2.603 G .103(he w)
-2.603 F .104(ord preceding the w)-.1 F .104
(ord being completed on the current com-)-.1 F .102(mand line.)184 684 R
.102(When it \214nishes, the possible completions are retrie)5.102 F
-.15(ve)-.25 G 2.601(df).15 G .101(rom the v)-2.601 F .101(alue of the)
-.25 F F3(COMPREPL)184 696 Q(Y)-.828 E F0(array v)2.25 E(ariable.)-.25 E
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(60)190.395 E 0 Cg EP
%%Page: 61 61
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF<ad47>144 84 Q/F2 10/Times-Italic@0 SF(globpat)2.5 E F0 1.007
(The pathname e)184 96 R 1.007(xpansion pattern)-.15 F F2(globpat)3.507
E F0 1.007(is e)3.507 F 1.008(xpanded to generate the possible comple-)
-.15 F(tions.)184 108 Q F1<ad50>144 120 Q F2(pr)2.5 E(e\214x)-.37 E(pr)
184 132 Q(e\214x)-.37 E F0 .535(is added at the be)3.035 F .534
(ginning of each possible completion after all other options ha)-.15 F
-.15(ve)-.2 G(been applied.)184 144 Q F1<ad53>144 156 Q F2(suf)2.5 E
<8c78>-.18 E(suf)184 156 Q<8c78>-.18 E F0
(is appended to each possible completion after all other options ha)2.5
E .3 -.15(ve b)-.2 H(een applied.).15 E F1<ad57>144 168 Q F2(wor)2.5 E
(dlist)-.37 E F0(The)184 180 Q F2(wor)3.639 E(dlist)-.37 E F0 1.14
(is split using the characters in the)3.639 F/F3 9/Times-Bold@0 SF(IFS)
3.64 E F0 1.14(special v)3.39 F 1.14(ariable as delimiters, and)-.25 F
.981(each resultant w)184 192 R .981(ord is e)-.1 F 3.481
(xpanded. Shell)-.15 F .981(quoting is honored within)3.481 F F2(wor)
3.481 E(dlist)-.37 E F0 3.48(,i)C 3.48(no)-3.48 G .98(rder to)-3.48 F
(pro)184 204 Q .765(vide a mechanism for the w)-.15 F .766
(ords to contain shell metacharacters or characters in the)-.1 F -.25
(va)184 216 S 1.965(lue of).25 F F3(IFS)4.465 E/F4 9/Times-Roman@0 SF(.)
A F0 1.964
(The possible completions are the members of the resultant list which)
6.465 F(match the w)184 228 Q(ord being completed.)-.1 E F1<ad58>144 240
Q F2(\214lterpat)2.5 E(\214lterpat)184 252 Q F0 .455
(is a pattern as used for pathname e)2.955 F 2.956(xpansion. It)-.15 F
.456(is applied to the list of possible)2.956 F 1.596
(completions generated by the preceding options and ar)184 264 R 1.596
(guments, and each completion)-.18 F(matching)184 276 Q F2(\214lterpat)
3.204 E F0 .704(is remo)3.204 F -.15(ve)-.15 G 3.204(df).15 G .704
(rom the list.)-3.204 F 3.204(Al)5.704 G(eading)-3.204 E F1(!)3.204 E F0
(in)3.204 E F2(\214lterpat)3.205 E F0(ne)3.205 E -.05(ga)-.15 G .705
(tes the pattern;).05 F(in this case, an)184 288 Q 2.5(yc)-.15 G
(ompletion not matching)-2.5 E F2(\214lterpat)2.5 E F0(is remo)2.5 E
-.15(ve)-.15 G(d.).15 E .467(The return v)144 304.8 R .467
(alue is true unless an in)-.25 F -.25(va)-.4 G .466
(lid option is supplied, an option other than).25 F F1<ad70>2.966 E F0
(or)2.966 E F1<ad72>2.966 E F0 .466(is sup-)2.966 F 1.361
(plied without a)144 316.8 R F2(name)3.861 E F0(ar)3.861 E 1.361
(gument, an attempt is made to remo)-.18 F 1.662 -.15(ve a c)-.15 H
1.362(ompletion speci\214cation for a).15 F F2(name)144 328.8 Q F0
(for which no speci\214cation e)2.5 E
(xists, or an error occurs adding a completion speci\214cation.)-.15 E
F1(compopt)108 345.6 Q F0([)2.5 E F1<ad6f>A F2(option)2.5 E F0 2.5(][)C
F1(\255DEI)-2.5 E F0 2.5(][)C F1(+o)-2.5 E F2(option)2.5 E F0 2.5(][)C
F2(name)-2.5 E F0(])A .447(Modify completion options for each)144 357.6
R F2(name)2.947 E F0 .447(according to the)2.947 F F2(option)2.947 E F0
.447(s, or for the currently-e)B -.15(xe)-.15 G(cuting).15 E .725
(completion if no)144 369.6 R F2(name)3.225 E F0 3.225(sa)C .725
(re supplied.)-3.225 F .725(If no)5.725 F F2(option)3.225 E F0 3.225(sa)
C .725(re gi)-3.225 F -.15(ve)-.25 G .726
(n, display the completion options for).15 F(each)144 381.6 Q F2(name)
3.224 E F0 .724(or the current completion.)3.224 F .724(The possible v)
5.724 F .724(alues of)-.25 F F2(option)3.224 E F0 .724(are those v)3.224
F .723(alid for the)-.25 F F1(com-)3.223 E(plete)144 393.6 Q F0 -.2(bu)
2.677 G .177(iltin described abo).2 F -.15(ve)-.15 G 5.178(.T).15 G(he)
-5.178 E F1<ad44>2.678 E F0 .178
(option indicates that other supplied options should apply to)2.678 F
1.228(the `)144 405.6 R(`def)-.74 E(ault')-.1 E 3.728('c)-.74 G 1.228(o\
mmand completion; that is, completion attempted on a command for which \
no)-3.728 F 2.038(completion has pre)144 417.6 R 2.038
(viously been de\214ned.)-.25 F(The)7.038 E F1<ad45>4.538 E F0 2.039
(option indicates that other supplied options)4.538 F 1.539
(should apply to `)144 429.6 R(`empty')-.74 E 4.039('c)-.74 G 1.538
(ommand completion; that is, completion attempted on a blank line.)
-4.039 F(The)144 441.6 Q F1<ad49>3.02 E F0 .52(option indicates that ot\
her supplied options should apply to completion on the initial non-)3.02
F .868(assignment w)144 453.6 R .868
(ord on the line, or after a command delimiter such as)-.1 F F1(;)3.368
E F0(or)3.368 E F1(|)3.368 E F0 3.367(,w)C .867(hich is usually com-)
-3.367 F(mand name completion.)144 465.6 Q .431(The return v)144 489.6 R
.431(alue is true unless an in)-.25 F -.25(va)-.4 G .431
(lid option is supplied, an attempt is made to modify the op-).25 F
(tions for a)144 501.6 Q F2(name)2.5 E F0
(for which no completion speci\214cation e)2.5 E
(xists, or an output error occurs.)-.15 E F1(continue)108 518.4 Q F0([)
2.5 E F2(n)A F0(])A .851(Resume the ne)144 530.4 R .851
(xt iteration of the enclosing)-.15 F F1 -.25(fo)3.351 G(r).25 E F0(,)A
F1(while)3.351 E F0(,)A F1(until)3.351 E F0 3.351(,o)C(r)-3.351 E F1
(select)3.35 E F0 3.35(loop. If)3.35 F F2(n)3.71 E F0 .85
(is speci\214ed, re-)3.59 F .203(sume at the)144 542.4 R F2(n)2.703 E F0
.203(th enclosing loop.)B F2(n)5.563 E F0 .203(must be)2.943 F/F5 10
/Symbol SF<b3>2.703 E F0 2.704(1. If)2.703 F F2(n)3.064 E F0 .204
(is greater than the number of enclosing loops,)2.944 F 1.184
(the last enclosing loop \(the `)144 554.4 R(`top-le)-.74 E -.15(ve)-.25
G(l').15 E 3.684('l)-.74 G 1.184(oop\) is resumed.)-3.684 F 1.183
(The return v)6.184 F 1.183(alue is 0 unless)-.25 F F2(n)3.683 E F0
1.183(is not)3.683 F(greater than or equal to 1.)144 566.4 Q F1(declar)
108 583.2 Q(e)-.18 E F0([)2.5 E F1(\255aAfFgiIlnrtux)A F0 2.5(][)C F1
<ad70>-2.5 E F0 2.5(][)C F2(name)-2.5 E F0([=)A F2(value)A F0 2.5(].)C
(..])-2.5 E F1(typeset)108 595.2 Q F0([)2.5 E F1(\255aAfFgiIlnrtux)A F0
2.5(][)C F1<ad70>-2.5 E F0 2.5(][)C F2(name)-2.5 E F0([=)A F2(value)A F0
2.5(].)C(..])-2.5 E 1.264(Declare v)144 607.2 R 1.264
(ariables and/or gi)-.25 F 1.564 -.15(ve t)-.25 H 1.264(hem attrib).15 F
3.765(utes. If)-.2 F(no)3.765 E F2(name)3.765 E F0 3.765(sa)C 1.265
(re gi)-3.765 F -.15(ve)-.25 G 3.765(nt).15 G 1.265(hen display the v)
-3.765 F 1.265(alues of)-.25 F -.25(va)144 619.2 S 3.46(riables. The).25
F F1<ad70>3.46 E F0 .96(option will display the attrib)3.46 F .96
(utes and v)-.2 F .96(alues of each)-.25 F F2(name)3.82 E F0 5.96(.W).18
G(hen)-5.96 E F1<ad70>3.46 E F0 .96(is used)3.46 F(with)144 631.2 Q F2
(name)2.774 E F0(ar)2.774 E .274
(guments, additional options, other than)-.18 F F1<ad66>2.775 E F0(and)
2.775 E F1<ad46>2.775 E F0 2.775(,a)C .275(re ignored.)-2.775 F(When)
5.275 E F1<ad70>2.775 E F0 .275(is supplied)2.775 F(without)144 643.2 Q
F2(name)3.79 E F0(ar)3.79 E 1.29(guments, it will display the attrib)
-.18 F 1.289(utes and v)-.2 F 1.289(alues of all v)-.25 F 1.289
(ariables ha)-.25 F 1.289(ving the at-)-.2 F(trib)144 655.2 Q .38
(utes speci\214ed by the additional options.)-.2 F .38
(If no other options are supplied with)5.38 F F1<ad70>2.88 E F0(,)A F1
(declar)2.88 E(e)-.18 E F0(will)2.88 E 1.107(display the attrib)144
667.2 R 1.107(utes and v)-.2 F 1.106(alues of all shell v)-.25 F 3.606
(ariables. The)-.25 F F1<ad66>3.606 E F0 1.106
(option will restrict the display to)3.606 F .299(shell functions.)144
679.2 R(The)5.299 E F1<ad46>2.799 E F0 .299(option inhibits the display\
 of function de\214nitions; only the function name)2.799 F 1.54
(and attrib)144 691.2 R 1.54(utes are printed.)-.2 F 1.54(If the)6.54 F
F1(extdeb)4.04 E(ug)-.2 E F0 1.54(shell option is enabled using)4.04 F
F1(shopt)4.04 E F0 4.04(,t)C 1.54(he source \214le)-4.04 F .648
(name and line number where each)144 703.2 R F2(name)3.148 E F0 .648
(is de\214ned are displayed as well.)3.148 F(The)5.648 E F1<ad46>3.148 E
F0 .649(option implies)3.149 F F1<ad66>144 715.2 Q F0 5.837(.T)C(he)
-5.837 E F1<ad67>3.337 E F0 .837(option forces v)3.337 F .836
(ariables to be created or modi\214ed at the global scope, e)-.25 F -.15
(ve)-.25 G 3.336(nw).15 G(hen)-3.336 E F1(de-)3.336 E(clar)144 727.2 Q
(e)-.18 E F0 .818(is e)3.318 F -.15(xe)-.15 G .818
(cuted in a shell function.).15 F .818
(It is ignored in all other cases.)5.818 F(The)5.819 E F1<ad49>3.319 E
F0 .819(option causes local)3.319 F(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(61)190.395 E 0 Cg EP
%%Page: 62 62
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E -.25(va)144 84 S
.694(riables to inherit the attrib).25 F .694(utes \(e)-.2 F .694
(xcept the)-.15 F/F1 10/Times-Italic@0 SF(namer)3.194 E(ef)-.37 E F0
(attrib)3.194 E .693(ute\) and v)-.2 F .693(alue of an)-.25 F 3.193(ye)
-.15 G .693(xisting v)-3.343 F(ariable)-.25 E .82(with the same)144 96 R
F1(name)3.32 E F0 .82(at a surrounding scope.)3.32 F .82
(If there is no e)5.82 F .82(xisting v)-.15 F .82(ariable, the local v)
-.25 F .82(ariable is)-.25 F .38(initially unset.)144 108 R .38
(The follo)5.38 F .379(wing options can be used to restrict output to v)
-.25 F .379(ariables with the speci\214ed)-.25 F(attrib)144 120 Q
(ute or to gi)-.2 E .3 -.15(ve v)-.25 H(ariables attrib)-.1 E(utes:)-.2
E/F2 10/Times-Bold@0 SF<ad61>144 132 Q F0(Each)180 132 Q F1(name)2.5 E
F0(is an inde)2.5 E -.15(xe)-.15 G 2.5(da).15 G(rray v)-2.5 E
(ariable \(see)-.25 E F2(Arrays)2.5 E F0(abo)2.5 E -.15(ve)-.15 G(\).)
.15 E F2<ad41>144 144 Q F0(Each)180 144 Q F1(name)2.5 E F0
(is an associati)2.5 E .3 -.15(ve a)-.25 H(rray v).15 E(ariable \(see)
-.25 E F2(Arrays)2.5 E F0(abo)2.5 E -.15(ve)-.15 G(\).).15 E F2<ad66>144
156 Q F0(Use function names only)180 156 Q(.)-.65 E F2<ad69>144 168 Q F0
.557(The v)180 168 R .558(ariable is treated as an inte)-.25 F .558
(ger; arithmetic e)-.15 F -.25(va)-.25 G .558(luation \(see).25 F/F3 9
/Times-Bold@0 SF .558(ARITHMETIC EV)3.058 F(ALU)-1.215 E(A-)-.54 E(TION)
180 180 Q F0(abo)2.25 E -.15(ve)-.15 G 2.5(\)i).15 G 2.5(sp)-2.5 G
(erformed when the v)-2.5 E(ariable is assigned a v)-.25 E(alue.)-.25 E
F2<ad6c>144 192 Q F0 .91(When the v)180 192 R .909
(ariable is assigned a v)-.25 F .909(alue, all upper)-.25 F .909
(-case characters are con)-.2 F -.15(ve)-.4 G .909(rted to lo).15 F(wer)
-.25 E(-)-.2 E 2.5(case. The)180 204 R(upper)2.5 E(-case attrib)-.2 E
(ute is disabled.)-.2 E F2<ad6e>144 216 Q F0(Gi)180 216 Q 1.619 -.15
(ve e)-.25 H(ach).15 E F1(name)3.819 E F0(the)3.819 E F1(namer)3.819 E
(ef)-.37 E F0(attrib)3.819 E 1.319
(ute, making it a name reference to another v)-.2 F(ariable.)-.25 E .478
(That other v)180 228 R .478(ariable is de\214ned by the v)-.25 F .478
(alue of)-.25 F F1(name)2.978 E F0 5.478(.A)C .478
(ll references, assignments, and at-)-5.478 F(trib)180 240 Q .781
(ute modi\214cations to)-.2 F F1(name)3.281 E F0 3.281(,e)C .782
(xcept those using or changing the)-3.431 F F2<ad6e>3.282 E F0(attrib)
3.282 E .782(ute itself, are)-.2 F .809(performed on the v)180 252 R
.809(ariable referenced by)-.25 F F1(name)3.308 E F0 1.908 -.55('s v)D
3.308(alue. The).3 F .808(nameref attrib)3.308 F .808(ute cannot be)-.2
F(applied to array v)180 264 Q(ariables.)-.25 E F2<ad72>144 276 Q F0
(Mak)180 276 Q(e)-.1 E F1(name)3.654 E F0 3.654(sr)C(eadonly)-3.654 E
6.154(.T)-.65 G 1.154(hese names cannot then be assigned v)-6.154 F
1.155(alues by subsequent as-)-.25 F(signment statements or unset.)180
288 Q F2<ad74>144 300 Q F0(Gi)180 300 Q .73 -.15(ve e)-.25 H(ach).15 E
F1(name)2.93 E F0(the)2.929 E F1(tr)2.929 E(ace)-.15 E F0(attrib)2.929 E
2.929(ute. T)-.2 F .429(raced functions inherit the)-.35 F F2(DEB)2.929
E(UG)-.1 E F0(and)2.929 E F2(RETURN)2.929 E F0
(traps from the calling shell.)180 312 Q(The trace attrib)5 E
(ute has no special meaning for v)-.2 E(ariables.)-.25 E F2<ad75>144 324
Q F0 .909(When the v)180 324 R .909(ariable is assigned a v)-.25 F .909
(alue, all lo)-.25 F(wer)-.25 E .909(-case characters are con)-.2 F -.15
(ve)-.4 G .91(rted to upper).15 F(-)-.2 E 2.5(case. The)180 336 R(lo)2.5
E(wer)-.25 E(-case attrib)-.2 E(ute is disabled.)-.2 E F2<ad78>144 348 Q
F0(Mark)180 348 Q F1(name)2.5 E F0 2.5(sf)C(or e)-2.5 E
(xport to subsequent commands via the en)-.15 E(vironment.)-.4 E .144
(Using `+' instead of `\255' turns of)144 364.8 R 2.643(ft)-.25 G .143
(he attrib)-2.643 F .143(ute instead, with the e)-.2 F .143
(xceptions that)-.15 F F2(+a)2.643 E F0(and)2.643 E F2(+A)2.643 E F0
.143(may not)2.643 F .578(be used to destro)144 376.8 R 3.079(ya)-.1 G
.579(rray v)-3.079 F .579(ariables and)-.25 F F2(+r)3.079 E F0 .579
(will not remo)3.079 F .879 -.15(ve t)-.15 H .579(he readonly attrib).15
F 3.079(ute. When)-.2 F .579(used in a)3.079 F(function,)144 388.8 Q F2
(declar)3.544 E(e)-.18 E F0(and)3.544 E F2(typeset)3.544 E F0(mak)3.544
E 3.544(ee)-.1 G(ach)-3.544 E F1(name)3.543 E F0 1.043
(local, as with the)3.543 F F2(local)3.543 E F0 1.043
(command, unless the)3.543 F F2<ad67>3.543 E F0 1.205
(option is supplied.)144 400.8 R 1.205(If a v)6.205 F 1.205
(ariable name is follo)-.25 F 1.205(wed by =)-.25 F F1(value)A F0 3.705
(,t)C 1.205(he v)-3.705 F 1.205(alue of the v)-.25 F 1.205
(ariable is set to)-.25 F F1(value)144 412.8 Q F0 5.218(.W)C .218
(hen using)-5.218 F F2<ad61>2.718 E F0(or)2.718 E F2<ad41>2.718 E F0
.217(and the compound assignment syntax to create array v)2.717 F .217
(ariables, addi-)-.25 F .882(tional attrib)144 424.8 R .882
(utes do not tak)-.2 F 3.382(ee)-.1 G -.25(ff)-3.382 G .882
(ect until subsequent assignments.).25 F .882(The return v)5.882 F .882
(alue is 0 unless an)-.25 F(in)144 436.8 Q -.25(va)-.4 G .366(lid optio\
n is encountered, an attempt is made to de\214ne a function using).25 F
/F4 10/Courier@0 SF .365(\255f foo=bar)2.865 F F0 2.865(,a)C 2.865(na)
-2.865 G(t-)-2.865 E .548(tempt is made to assign a v)144 448.8 R .548
(alue to a readonly v)-.25 F .549
(ariable, an attempt is made to assign a v)-.25 F .549(alue to an)-.25 F
1.749(array v)144 460.8 R 1.749
(ariable without using the compound assignment syntax \(see)-.25 F F2
(Arrays)4.248 E F0(abo)4.248 E -.15(ve)-.15 G 1.748(\), one of the).15 F
F1(names)144 472.8 Q F0 .359(is not a v)2.858 F .359(alid shell v)-.25 F
.359(ariable name, an attempt is made to turn of)-.25 F 2.859(fr)-.25 G
.359(eadonly status for a read-)-2.859 F 1.213(only v)144 484.8 R 1.213
(ariable, an attempt is made to turn of)-.25 F 3.713(fa)-.25 G 1.213
(rray status for an array v)-3.713 F 1.212(ariable, or an attempt is)
-.25 F(made to display a non-e)144 496.8 Q(xistent function with)-.15 E
F2<ad66>2.5 E F0(.)A F2(dirs [\255clpv] [+)108 513.6 Q F1(n)A F2 2.5(][)
C<ad>-2.5 E F1(n)A F2(])A F0 -.4(Wi)144 525.6 S .328
(thout options, displays the list of currently remembered directories.)
.4 F .329(The def)5.329 F .329(ault display is on a)-.1 F 1.238
(single line with directory names separated by spaces.)144 537.6 R 1.238
(Directories are added to the list with the)6.238 F F2(pushd)144 549.6 Q
F0 .927(command; the)3.427 F F2(popd)3.428 E F0 .928(command remo)3.428
F -.15(ve)-.15 G 3.428(se).15 G .928(ntries from the list.)-3.428 F .928
(The current directory is al-)5.928 F -.1(wa)144 561.6 S
(ys the \214rst directory in the stack.).1 E F2<ad63>144 573.6 Q F0
(Clears the directory stack by deleting all of the entries.)180 573.6 Q
F2<ad6c>144 585.6 Q F0 .882
(Produces a listing using full pathnames; the def)180 585.6 R .881
(ault listing format uses a tilde to denote)-.1 F(the home directory)180
597.6 Q(.)-.65 E F2<ad70>144 609.6 Q F0
(Print the directory stack with one entry per line.)180 609.6 Q F2<ad76>
144 621.6 Q F0 .272(Print the directory stack with one entry per line, \
pre\214xing each entry with its inde)180 621.6 R 2.773(xi)-.15 G 2.773
(nt)-2.773 G(he)-2.773 E(stack.)180 633.6 Q F2(+)144 645.6 Q F1(n)A F0
1.565(Displays the)180 645.6 R F1(n)4.065 E F0 1.565
(th entry counting from the left of the list sho)B 1.564(wn by)-.25 F F2
(dirs)4.064 E F0 1.564(when in)4.064 F -.2(vo)-.4 G -.1(ke).2 G(d).1 E
(without options, starting with zero.)180 657.6 Q F2<ad>144 669.6 Q F1
(n)A F0 1.194(Displays the)180 669.6 R F1(n)3.694 E F0 1.194
(th entry counting from the right of the list sho)B 1.194(wn by)-.25 F
F2(dirs)3.694 E F0 1.194(when in)3.694 F -.2(vo)-.4 G -.1(ke).2 G(d).1 E
(without options, starting with zero.)180 681.6 Q .258(The return v)144
698.4 R .258(alue is 0 unless an in)-.25 F -.25(va)-.4 G .258
(lid option is supplied or).25 F F1(n)2.758 E F0(inde)2.758 E -.15(xe)
-.15 G 2.758(sb).15 G -.15(ey)-2.758 G .258(ond the end of the direc-)
.15 F(tory stack.)144 710.4 Q(GNU Bash 5.1)72 768 Q(2020 October 29)
141.235 E(62)190.395 E 0 Cg EP
%%Page: 63 63
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(diso)108 84 Q(wn)-.1 E F0([)2.5 E F1(\255ar)A F0 2.5(][)C F1<ad68>
-2.5 E F0 2.5(][)C/F2 10/Times-Italic@0 SF(jobspec)-2.5 E F0(... |)2.5 E
F2(pid)2.5 E F0(... ])2.5 E -.4(Wi)144 96 S .121(thout options, remo).4
F .422 -.15(ve e)-.15 H(ach).15 E F2(jobspec)4.362 E F0 .122
(from the table of acti)2.932 F .422 -.15(ve j)-.25 H 2.622(obs. If).15
F F2(jobspec)4.362 E F0 .122(is not present, and)2.932 F .096
(neither the)144 108 R F1<ad61>2.596 E F0 .096(nor the)2.596 F F1<ad72>
2.596 E F0 .096(option is supplied, the)2.596 F F2(curr)2.596 E .096
(ent job)-.37 F F0 .096(is used.)2.596 F .096(If the)5.096 F F1<ad68>
2.596 E F0 .096(option is gi)2.596 F -.15(ve)-.25 G .096(n, each).15 F
F2(jobspec)145.74 120 Q F0 .585(is not remo)3.395 F -.15(ve)-.15 G 3.085
(df).15 G .585(rom the table, b)-3.085 F .585(ut is mark)-.2 F .585
(ed so that)-.1 F/F3 9/Times-Bold@0 SF(SIGHUP)3.085 E F0 .586
(is not sent to the job if the)2.835 F .962(shell recei)144 132 R -.15
(ve)-.25 G 3.462(sa).15 G F3(SIGHUP)A/F4 9/Times-Roman@0 SF(.)A F0 .962
(If no)5.462 F F2(jobspec)5.202 E F0 .962(is supplied, the)3.772 F F1
<ad61>3.462 E F0 .962(option means to remo)3.462 F 1.262 -.15(ve o)-.15
H 3.462(rm).15 G .962(ark all)-3.462 F 1.358(jobs; the)144 144 R F1
<ad72>3.858 E F0 1.358(option without a)3.858 F F2(jobspec)5.598 E F0
(ar)4.169 E 1.359(gument restricts operation to running jobs.)-.18 F
1.359(The return)6.359 F -.25(va)144 156 S(lue is 0 unless a).25 E F2
(jobspec)4.24 E F0(does not specify a v)2.81 E(alid job)-.25 E(.)-.4 E
F1(echo)108 172.8 Q F0([)2.5 E F1(\255neE)A F0 2.5(][)C F2(ar)-2.5 E(g)
-.37 E F0(...])2.5 E .425(Output the)144 184.8 R F2(ar)2.925 E(g)-.37 E
F0 .424(s, separated by spaces, follo)B .424(wed by a ne)-.25 F 2.924
(wline. The)-.25 F .424(return status is 0 unless a write)2.924 F .307
(error occurs.)144 196.8 R(If)5.307 E F1<ad6e>2.807 E F0 .307
(is speci\214ed, the trailing ne)2.807 F .308(wline is suppressed.)-.25
F .308(If the)5.308 F F1<ad65>2.808 E F0 .308(option is gi)2.808 F -.15
(ve)-.25 G .308(n, inter).15 F(-)-.2 E .198(pretation of the follo)144
208.8 R .198(wing backslash-escaped characters is enabled.)-.25 F(The)
5.198 E F1<ad45>2.698 E F0 .197(option disables the in-)2.697 F .067
(terpretation of these escape characters, e)144 220.8 R -.15(ve)-.25 G
2.567(no).15 G 2.567(ns)-2.567 G .067(ystems where the)-2.567 F 2.567
(ya)-.15 G .067(re interpreted by def)-2.567 F 2.568(ault. The)-.1 F F1
(xpg_echo)144 232.8 Q F0 .602
(shell option may be used to dynamically determine whether or not)3.102
F F1(echo)3.101 E F0 -.15(ex)3.101 G .601(pands these).15 F .658
(escape characters by def)144 244.8 R(ault.)-.1 E F1(echo)5.658 E F0
.659(does not interpret)3.159 F F1<adad>3.159 E F0 .659
(to mean the end of options.)3.159 F F1(echo)5.659 E F0(inter)3.159 E(-)
-.2 E(prets the follo)144 256.8 Q(wing escape sequences:)-.25 E F1(\\a)
144 268.8 Q F0(alert \(bell\))180 268.8 Q F1(\\b)144 280.8 Q F0
(backspace)180 280.8 Q F1(\\c)144 292.8 Q F0(suppress further output)180
292.8 Q F1(\\e)144 304.8 Q(\\E)144 316.8 Q F0(an escape character)180
316.8 Q F1(\\f)144 328.8 Q F0(form feed)180 328.8 Q F1(\\n)144 340.8 Q
F0(ne)180 340.8 Q 2.5(wl)-.25 G(ine)-2.5 E F1(\\r)144 352.8 Q F0
(carriage return)180 352.8 Q F1(\\t)144 364.8 Q F0(horizontal tab)180
364.8 Q F1(\\v)144 376.8 Q F0 -.15(ve)180 376.8 S(rtical tab).15 E F1
(\\\\)144 388.8 Q F0(backslash)180 388.8 Q F1(\\0)144 400.8 Q F2(nnn)A
F0(the eight-bit character whose v)180 400.8 Q(alue is the octal v)-.25
E(alue)-.25 E F2(nnn)2.5 E F0(\(zero to three octal digits\))2.5 E F1
(\\x)144 412.8 Q F2(HH)A F0(the eight-bit character whose v)180 412.8 Q
(alue is the he)-.25 E(xadecimal v)-.15 E(alue)-.25 E F2(HH)2.5 E F0
(\(one or tw)2.5 E 2.5(oh)-.1 G .3 -.15(ex d)-2.5 H(igits\)).15 E F1
(\\u)144 424.8 Q F2(HHHH)A F0 1.507
(the Unicode \(ISO/IEC 10646\) character whose v)180 436.8 R 1.506
(alue is the he)-.25 F 1.506(xadecimal v)-.15 F(alue)-.25 E F2(HHHH)
4.006 E F0(\(one to four he)180 448.8 Q 2.5(xd)-.15 G(igits\))-2.5 E F1
(\\U)144 460.8 Q F2(HHHHHHHH)A F0 .547
(the Unicode \(ISO/IEC 10646\) character whose v)180 472.8 R .547
(alue is the he)-.25 F .548(xadecimal v)-.15 F(alue)-.25 E F2(HHHHH-)
3.048 E(HHH)180 484.8 Q F0(\(one to eight he)2.5 E 2.5(xd)-.15 G
(igits\))-2.5 E F1(enable)108 501.6 Q F0([)2.5 E F1<ad61>A F0 2.5(][)C
F1(\255dnps)-2.5 E F0 2.5(][)C F1<ad66>-2.5 E F2(\214lename)2.5 E F0 2.5
(][)C F2(name)-2.5 E F0(...])2.5 E .278(Enable and disable b)144 513.6 R
.278(uiltin shell commands.)-.2 F .278(Disabling a b)5.278 F .278
(uiltin allo)-.2 F .278(ws a disk command which has)-.25 F .833
(the same name as a shell b)144 525.6 R .834(uiltin to be e)-.2 F -.15
(xe)-.15 G .834(cuted without specifying a full pathname, e).15 F -.15
(ve)-.25 G 3.334(nt).15 G(hough)-3.334 E .99
(the shell normally searches for b)144 537.6 R .989
(uiltins before disk commands.)-.2 F(If)5.989 E F1<ad6e>3.489 E F0 .989
(is used, each)3.489 F F2(name)3.489 E F0 .989(is dis-)3.489 F .648
(abled; otherwise,)144 549.6 R F2(names)3.148 E F0 .648(are enabled.)
3.148 F -.15(Fo)5.648 G 3.148(re).15 G .648(xample, to use the)-3.298 F
F1(test)3.148 E F0 .648(binary found via the)3.148 F F3 -.666(PA)3.148 G
(TH)-.189 E F0(in-)2.899 E .539(stead of the shell b)144 561.6 R .538
(uiltin v)-.2 F .538(ersion, run)-.15 F/F5 10/Courier@0 SF .538
(enable -n test)3.038 F F0 5.538(.T)C(he)-5.538 E F1<ad66>3.038 E F0
.538(option means to load the ne)3.038 F(w)-.25 E -.2(bu)144 573.6 S
1.365(iltin command).2 F F2(name)4.225 E F0 1.365(from shared object)
4.045 F F2(\214lename)5.775 E F0 3.865(,o).18 G 3.865(ns)-3.865 G 1.365
(ystems that support dynamic loading.)-3.865 F(The)144 585.6 Q F1<ad64>
2.867 E F0 .367(option will delete a b)2.867 F .367(uiltin pre)-.2 F
.367(viously loaded with)-.25 F F1<ad66>2.866 E F0 5.366(.I)C 2.866(fn)
-5.366 G(o)-2.866 E F2(name)2.866 E F0(ar)2.866 E .366(guments are gi)
-.18 F -.15(ve)-.25 G .366(n, or).15 F .398(if the)144 597.6 R F1<ad70>
2.898 E F0 .399(option is supplied, a list of shell b)2.899 F .399
(uiltins is printed.)-.2 F -.4(Wi)5.399 G .399(th no other option ar).4
F .399(guments, the)-.18 F .099(list consists of all enabled shell b)144
609.6 R 2.598(uiltins. If)-.2 F F1<ad6e>2.598 E F0 .098
(is supplied, only disabled b)2.598 F .098(uiltins are printed.)-.2 F
(If)5.098 E F1<ad61>2.598 E F0 .905
(is supplied, the list printed includes all b)144 621.6 R .905
(uiltins, with an indication of whether or not each is en-)-.2 F 2.873
(abled. If)144 633.6 R F1<ad73>2.873 E F0 .372
(is supplied, the output is restricted to the POSIX)2.873 F F2(special)
2.872 E F0 -.2(bu)2.872 G 2.872(iltins. The).2 F .372(return v)2.872 F
.372(alue is)-.25 F 2.5(0u)144 645.6 S(nless a)-2.5 E F2(name)2.86 E F0
(is not a shell b)2.68 E(uiltin or there is an error loading a ne)-.2 E
2.5(wb)-.25 G(uiltin from a shared object.)-2.7 E F1 -2.3 -.15(ev a)108
662.4 T(l).15 E F0([)2.5 E F2(ar)A(g)-.37 E F0(...])2.5 E(The)144 674.4
Q F2(ar)3.17 E(g)-.37 E F0 3.17(sa)C .671
(re read and concatenated together into a single command.)-3.17 F .671
(This command is then read)5.671 F .479(and e)144 686.4 R -.15(xe)-.15 G
.479(cuted by the shell, and its e).15 F .479
(xit status is returned as the v)-.15 F .478(alue of)-.25 F F1 -2.3 -.15
(ev a)2.978 H(l).15 E F0 5.478(.I)C 2.978(ft)-5.478 G .478(here are no)
-2.978 F F2(ar)3.308 E(gs)-.37 E F0(,).27 E(or only null ar)144 698.4 Q
(guments,)-.18 E F1 -2.3 -.15(ev a)2.5 H(l).15 E F0(returns 0.)2.5 E
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(63)190.395 E 0 Cg EP
%%Page: 64 64
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(exec)108 84 Q F0([)2.5 E F1(\255cl)A F0 2.5(][)C F1<ad61>-2.5 E/F2 10
/Times-Italic@0 SF(name)2.5 E F0 2.5(][)C F2(command)-2.5 E F0([)2.5 E
F2(ar)A(guments)-.37 E F0(]])A(If)144 96 Q F2(command)3.005 E F0 .305
(is speci\214ed, it replaces the shell.)3.575 F .305(No ne)5.305 F 2.805
(wp)-.25 G .306(rocess is created.)-2.805 F(The)5.306 E F2(ar)3.136 E
(guments)-.37 E F0(become)3.076 E .177(the ar)144 108 R .177(guments to)
-.18 F F2(command)2.676 E F0 5.176(.I)C 2.676(ft)-5.176 G(he)-2.676 E F1
<ad6c>2.676 E F0 .176
(option is supplied, the shell places a dash at the be)2.676 F .176
(ginning of)-.15 F .48(the zeroth ar)144 120 R .48(gument passed to)-.18
F F2(command)3.18 E F0 5.48(.T).77 G .48(his is what)-5.48 F F2(lo)3.07
E(gin)-.1 E F0 .48(\(1\) does.).24 F(The)5.48 E F1<ad63>2.98 E F0 .48
(option causes)2.98 F F2(com-)3.18 E(mand)144 132 Q F0 .639(to be e)
3.909 F -.15(xe)-.15 G .638(cuted with an empty en).15 F 3.138
(vironment. If)-.4 F F1<ad61>3.138 E F0 .638
(is supplied, the shell passes)3.138 F F2(name)3.498 E F0 .638(as the)
3.318 F 1.077(zeroth ar)144 144 R 1.077(gument to the e)-.18 F -.15(xe)
-.15 G 1.077(cuted command.).15 F(If)6.077 E F2(command)3.777 E F0 1.077
(cannot be e)4.347 F -.15(xe)-.15 G 1.077(cuted for some reason, a).15 F
(non-interacti)144 156 Q .877 -.15(ve s)-.25 H .577(hell e).15 F .577
(xits, unless the)-.15 F F1(execfail)3.077 E F0 .577
(shell option is enabled.)3.077 F .576(In that case, it returns f)5.577
F(ail-)-.1 E 3.32(ure. An)144 168 R(interacti)3.32 E 1.12 -.15(ve s)-.25
H .82(hell returns f).15 F .82(ailure if the \214le cannot be e)-.1 F
-.15(xe)-.15 G 3.32(cuted. A).15 F .82(subshell e)3.32 F .82
(xits uncondi-)-.15 F .288(tionally if)144 180 R F1(exec)2.788 E F0 -.1
(fa)2.788 G 2.788(ils. If).1 F F2(command)2.988 E F0 .288
(is not speci\214ed, an)3.558 F 2.787(yr)-.15 G .287(edirections tak)
-2.787 F 2.787(ee)-.1 G -.25(ff)-2.787 G .287(ect in the current shell,)
.25 F(and the return status is 0.)144 192 Q
(If there is a redirection error)5 E 2.5(,t)-.4 G
(he return status is 1.)-2.5 E F1(exit)108 208.8 Q F0([)2.5 E F2(n)A F0
(])A .095(Cause the shell to e)144 208.8 R .095(xit with a status of)
-.15 F F2(n)2.595 E F0 5.095(.I)C(f)-5.095 E F2(n)2.955 E F0 .096
(is omitted, the e)2.835 F .096(xit status is that of the last command)
-.15 F -.15(exe)144 220.8 S 2.5(cuted. A).15 F(trap on)2.5 E/F3 9
/Times-Bold@0 SF(EXIT)2.5 E F0(is e)2.25 E -.15(xe)-.15 G
(cuted before the shell terminates.).15 E F1(export)108 237.6 Q F0([)2.5
E F1(\255fn)A F0 2.5(][).833 G F2(name)-2.5 E F0([=)A F2(wor)A(d)-.37 E
F0(]] ...)A F1(export \255p)108 249.6 Q F0 .257(The supplied)144 261.6 R
F2(names)3.117 E F0 .257(are mark)3.027 F .257(ed for automatic e)-.1 F
.257(xport to the en)-.15 F .257(vironment of subsequently e)-.4 F -.15
(xe)-.15 G(cuted).15 E 2.626(commands. If)144 273.6 R(the)2.626 E F1
<ad66>2.626 E F0 .127(option is gi)2.627 F -.15(ve)-.25 G .127(n, the)
.15 F F2(names)2.987 E F0 .127(refer to functions.)2.897 F .127(If no)
5.127 F F2(names)2.987 E F0 .127(are gi)2.897 F -.15(ve)-.25 G .127
(n, or if the).15 F F1<ad70>144 285.6 Q F0 .048
(option is supplied, a list of names of all e)2.548 F .048(xported v)
-.15 F .048(ariables is printed.)-.25 F(The)5.048 E F1<ad6e>2.547 E F0
.047(option causes the)2.547 F -.15(ex)144 297.6 S 1.446
(port property to be remo).15 F -.15(ve)-.15 G 3.947(df).15 G 1.447
(rom each)-3.947 F F2(name)3.947 E F0 6.447(.I)C 3.947(fav)-6.447 G
1.447(ariable name is follo)-4.197 F 1.447(wed by =)-.25 F F2(wor)A(d)
-.37 E F0 3.947(,t)C(he)-3.947 E -.25(va)144 309.6 S .742(lue of the v)
.25 F .742(ariable is set to)-.25 F F2(wor)3.242 E(d)-.37 E F0(.)A F1
(export)5.742 E F0 .742(returns an e)3.242 F .741
(xit status of 0 unless an in)-.15 F -.25(va)-.4 G .741(lid option is)
.25 F .031(encountered, one of the)144 321.6 R F2(names)2.531 E F0 .031
(is not a v)2.531 F .032(alid shell v)-.25 F .032(ariable name, or)-.25
F F1<ad66>2.532 E F0 .032(is supplied with a)2.532 F F2(name)2.892 E F0
(that)2.712 E(is not a function.)144 333.6 Q F1(fc)108 350.4 Q F0([)2.5
E F1<ad65>A F2(ename)2.5 E F0 2.5(][)C F1(\255lnr)-2.5 E F0 2.5(][)C F2
<8c72>-2.5 E(st)-.1 E F0 2.5(][)C F2(last)-2.5 E F0(])A F1(fc \255s)108
362.4 Q F0([)2.5 E F2(pat)A F0(=)A F2 -.37(re)C(p).37 E F0 2.5(][)C F2
(cmd)-2.5 E F0(])A .432
(The \214rst form selects a range of commands from)144 374.4 R F2<8c72>
4.842 E(st)-.1 E F0(to)3.612 E F2(last)3.022 E F0 .431
(from the history list and displays or)3.612 F .141(edits and re-e)144
386.4 R -.15(xe)-.15 G .141(cutes them.).15 F F2 -.45(Fi)5.141 G -.1(rs)
.45 G(t).1 E F0(and)3.321 E F2(last)2.731 E F0 .141
(may be speci\214ed as a string \(to locate the last command)3.321 F(be)
144 398.4 Q .311(ginning with that string\) or as a number \(an inde)
-.15 F 2.811(xi)-.15 G .31(nto the history list, where a ne)-2.811 F
-.05(ga)-.15 G(ti).05 E .61 -.15(ve n)-.25 H(umber).15 E .071
(is used as an of)144 410.4 R .071
(fset from the current command number\).)-.25 F .071(When listing, a)
5.071 F F2<8c72>2.571 E(st)-.1 E F0(or)2.571 E F2(last)2.571 E F0 .071
(of 0 is equi)2.571 F -.25(va)-.25 G(-).25 E .653
(lent to \2551 and \2550 is equi)144 422.4 R -.25(va)-.25 G .653
(lent to the current command \(usually the).25 F F1(fc)3.153 E F0 .653
(command\); otherwise 0 is)3.153 F(equi)144 434.4 Q -.25(va)-.25 G .242
(lent to \2551 and \2550 is in).25 F -.25(va)-.4 G 2.742(lid. If).25 F
F2(last)2.832 E F0 .242
(is not speci\214ed, it is set to the current command for list-)3.422 F
.093(ing \(so that)144 446.4 R/F4 10/Courier@0 SF .093(fc \255l \25510)
2.593 F F0 .093(prints the last 10 commands\) and to)2.593 F F2<8c72>
4.502 E(st)-.1 E F0 2.592(otherwise. If)3.272 F F2<8c72>4.502 E(st)-.1 E
F0 .092(is not speci-)3.272 F(\214ed, it is set to the pre)144 458.4 Q
(vious command for editing and \25516 for listing.)-.25 E(The)144 482.4
Q F1<ad6e>2.522 E F0 .022
(option suppresses the command numbers when listing.)2.522 F(The)5.022 E
F1<ad72>2.522 E F0 .022(option re)2.522 F -.15(ve)-.25 G .022
(rses the order of).15 F .438(the commands.)144 494.4 R .438(If the)
5.438 F F1<ad6c>2.938 E F0 .438(option is gi)2.938 F -.15(ve)-.25 G .438
(n, the commands are listed on standard output.).15 F(Otherwise,)5.438 E
.334(the editor gi)144 506.4 R -.15(ve)-.25 G 2.834(nb).15 G(y)-2.834 E
F2(ename)3.024 E F0 .335(is in)3.014 F -.2(vo)-.4 G -.1(ke).2 G 2.835
(do).1 G 2.835(na\214)-2.835 G .335(le containing those commands.)-2.835
F(If)5.335 E F2(ename)3.025 E F0 .335(is not gi)3.015 F -.15(ve)-.25 G
(n,).15 E .631(the v)144 518.4 R .631(alue of the)-.25 F F3(FCEDIT)3.131
E F0 -.25(va)2.881 G .631(riable is used, and the v).25 F .631(alue of)
-.25 F F3(EDIT)3.131 E(OR)-.162 E F0(if)2.881 E F3(FCEDIT)3.13 E F0 .63
(is not set.)2.88 F .63(If nei-)5.63 F .005(ther v)144 530.4 R .005
(ariable is set,)-.25 F F2(vi)4.171 E F0 .005(is used.)4.171 F .005
(When editing is complete, the edited commands are echoed and e)5.005 F
(x-)-.15 E(ecuted.)144 542.4 Q .789(In the second form,)144 566.4 R F2
(command)3.288 E F0 .788(is re-e)3.288 F -.15(xe)-.15 G .788
(cuted after each instance of).15 F F2(pat)3.288 E F0 .788
(is replaced by)3.288 F F2 -.37(re)3.288 G(p).37 E F0(.)A F2(Com-)5.788
E(mand)144 578.4 Q F0 .171(is interpreted the same as)2.671 F F2<8c72>
2.671 E(st)-.1 E F0(abo)2.671 E -.15(ve)-.15 G 5.171(.A).15 G .172
(useful alias to use with this is)-2.499 F F4 .172(r='fc \255s')2.672 F
F0 2.672(,s)C 2.672(ot)-2.672 G(hat)-2.672 E(typing)144 590.4 Q F4 7.166
(rc)3.666 G(c)-7.166 E F0 1.166(runs the last command be)3.666 F 1.166
(ginning with)-.15 F F4(cc)3.666 E F0 1.165(and typing)3.666 F F4(r)
3.665 E F0(re-e)3.665 E -.15(xe)-.15 G 1.165(cutes the last com-).15 F
(mand.)144 602.4 Q .142(If the \214rst form is used, the return v)144
626.4 R .142(alue is 0 unless an in)-.25 F -.25(va)-.4 G .142
(lid option is encountered or).25 F F2<8c72>4.552 E(st)-.1 E F0(or)3.322
E F2(last)2.732 E F0 .455(specify history lines out of range.)144 638.4
R .454(If the)5.454 F F1<ad65>2.954 E F0 .454
(option is supplied, the return v)2.954 F .454(alue is the v)-.25 F .454
(alue of the)-.25 F .787(last command e)144 650.4 R -.15(xe)-.15 G .787
(cuted or f).15 F .788
(ailure if an error occurs with the temporary \214le of commands.)-.1 F
.788(If the)5.788 F 1.136
(second form is used, the return status is that of the command re-e)144
662.4 R -.15(xe)-.15 G 1.135(cuted, unless).15 F F2(cmd)3.835 E F0 1.135
(does not)4.405 F(specify a v)144 674.4 Q
(alid history line, in which case)-.25 E F1(fc)2.5 E F0(returns f)2.5 E
(ailure.)-.1 E F1(fg)108 691.2 Q F0([)2.5 E F2(jobspec)A F0(])A(Resume)
144 703.2 Q F2(jobspec)5.653 E F0 1.413(in the fore)4.223 F 1.413
(ground, and mak)-.15 F 3.913(ei)-.1 G 3.913(tt)-3.913 G 1.413
(he current job)-3.913 F 6.413(.I)-.4 G(f)-6.413 E F2(jobspec)5.653 E F0
1.414(is not present, the)4.223 F(shell')144 715.2 Q 3.117(sn)-.55 G
.617(otion of the)-3.117 F F2(curr)3.117 E .617(ent job)-.37 F F0 .617
(is used.)3.117 F .617(The return v)5.617 F .616
(alue is that of the command placed into the)-.25 F(fore)144 727.2 Q
.362(ground, or f)-.15 F .362
(ailure if run when job control is disabled or)-.1 F 2.862(,w)-.4 G .363
(hen run with job control enabled, if)-2.862 F(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(64)190.395 E 0 Cg EP
%%Page: 65 65
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10
/Times-Italic@0 SF(jobspec)145.74 84 Q F0(does not specify a v)2.81 E
(alid job or)-.25 E F1(jobspec)4.24 E F0(speci\214es a job that w)2.81 E
(as started without job control.)-.1 E/F2 10/Times-Bold@0 SF(getopts)108
100.8 Q F1(optstring name)2.5 E F0([)2.5 E F1(ar)A 2.5(g.)-.37 G(..)-2.5
E F0(])A F2(getopts)144 112.8 Q F0 .793
(is used by shell procedures to parse positional parameters.)3.294 F F1
(optstring)6.023 E F0 .793(contains the option)3.513 F .149
(characters to be recognized; if a character is follo)144 124.8 R .15
(wed by a colon, the option is e)-.25 F .15(xpected to ha)-.15 F .45
-.15(ve a)-.2 H(n).15 E(ar)144 136.8 Q .579
(gument, which should be separated from it by white space.)-.18 F .578
(The colon and question mark char)5.579 F(-)-.2 E .636
(acters may not be used as option characters.)144 148.8 R .636
(Each time it is in)5.636 F -.2(vo)-.4 G -.1(ke).2 G(d,).1 E F2(getopts)
3.136 E F0 .636(places the ne)3.136 F .636(xt op-)-.15 F .03
(tion in the shell v)144 160.8 R(ariable)-.25 E F1(name)2.89 E F0 2.53
(,i).18 G(nitializing)-2.53 E F1(name)2.89 E F0 .029(if it does not e)
2.71 F .029(xist, and the inde)-.15 F 2.529(xo)-.15 G 2.529(ft)-2.529 G
.029(he ne)-2.529 F .029(xt ar)-.15 F(gu-)-.18 E .065
(ment to be processed into the v)144 172.8 R(ariable)-.25 E/F3 9
/Times-Bold@0 SF(OPTIND)2.565 E/F4 9/Times-Roman@0 SF(.)A F3(OPTIND)
4.565 E F0 .066(is initialized to 1 each time the shell or a)2.315 F
.885(shell script is in)144 184.8 R -.2(vo)-.4 G -.1(ke).2 G 3.385
(d. When).1 F .885(an option requires an ar)3.385 F(gument,)-.18 E F2
(getopts)3.385 E F0 .885(places that ar)3.385 F .885(gument into)-.18 F
.566(the v)144 196.8 R(ariable)-.25 E F3(OPT)3.066 E(ARG)-.81 E F4(.)A
F0 .566(The shell does not reset)5.066 F F3(OPTIND)3.066 E F0 .567
(automatically; it must be manually reset)2.816 F .39
(between multiple calls to)144 208.8 R F2(getopts)2.89 E F0 .39
(within the same shell in)2.89 F -.2(vo)-.4 G .389(cation if a ne).2 F
2.889(ws)-.25 G .389(et of parameters is to)-2.889 F(be used.)144 220.8
Q 2.043(When the end of options is encountered,)144 244.8 R F2(getopts)
4.543 E F0 -.15(ex)4.543 G 2.043(its with a return v).15 F 2.044
(alue greater than zero.)-.25 F F3(OPTIND)144 256.8 Q F0
(is set to the inde)2.25 E 2.5(xo)-.15 G 2.5(ft)-2.5 G
(he \214rst non-option ar)-2.5 E(gument, and)-.18 E F1(name)2.5 E F0
(is set to ?.)2.5 E F2(getopts)144 280.8 Q F0 .485
(normally parses the positional parameters, b)2.985 F .485
(ut if more ar)-.2 F .485(guments are supplied as)-.18 F F1(ar)3.315 E
(g)-.37 E F0 -.25(va)3.205 G(l-).25 E(ues,)144 292.8 Q F2(getopts)2.5 E
F0(parses those instead.)2.5 E F2(getopts)144 316.8 Q F0 .345
(can report errors in tw)2.845 F 2.845(ow)-.1 G 2.845(ays. If)-2.945 F
.345(the \214rst character of)2.845 F F1(optstring)3.075 E F0 .345
(is a colon,)3.065 F F1(silent)3.185 E F0 .345(error re-)3.525 F 1.669
(porting is used.)144 328.8 R 1.668
(In normal operation, diagnostic messages are printed when in)6.669 F
-.25(va)-.4 G 1.668(lid options or).25 F .393(missing option ar)144
340.8 R .393(guments are encountered.)-.18 F .394(If the v)5.394 F
(ariable)-.25 E F3(OPTERR)2.894 E F0 .394
(is set to 0, no error messages)2.644 F(will be displayed, e)144 352.8 Q
-.15(ve)-.25 G 2.5(ni).15 G 2.5(ft)-2.5 G(he \214rst character of)-2.5 E
F1(optstring)2.73 E F0(is not a colon.)2.72 E .667(If an in)144 376.8 R
-.25(va)-.4 G .667(lid option is seen,).25 F F2(getopts)3.167 E F0 .667
(places ? into)3.167 F F1(name)3.527 E F0 .666
(and, if not silent, prints an error message)3.347 F .399(and unsets)144
388.8 R F3(OPT)2.899 E(ARG)-.81 E F4(.)A F0(If)4.899 E F2(getopts)2.899
E F0 .399(is silent, the option character found is placed in)2.899 F F3
(OPT)2.899 E(ARG)-.81 E F0 .4(and no)2.65 F
(diagnostic message is printed.)144 400.8 Q 1.242(If a required ar)144
424.8 R 1.242(gument is not found, and)-.18 F F2(getopts)3.741 E F0
1.241(is not silent, a question mark \()3.741 F F2(?).833 E F0 3.741
(\)i).833 G 3.741(sp)-3.741 G 1.241(laced in)-3.741 F F1(name)144.36
436.8 Q F0(,).18 E F3(OPT)2.713 E(ARG)-.81 E F0 .213
(is unset, and a diagnostic message is printed.)2.463 F(If)5.213 E F2
(getopts)2.713 E F0 .213(is silent, then a colon \()2.713 F F2(:).833 E
F0(\)).833 E(is placed in)144 448.8 Q F1(name)2.86 E F0(and)2.68 E F3
(OPT)2.5 E(ARG)-.81 E F0(is set to the option character found.)2.25 E F2
(getopts)144 472.8 Q F0 .902
(returns true if an option, speci\214ed or unspeci\214ed, is found.)
3.402 F .902(It returns f)5.902 F .901(alse if the end of)-.1 F
(options is encountered or an error occurs.)144 484.8 Q F2(hash)108
501.6 Q F0([)2.5 E F2(\255lr)A F0 2.5(][)C F2<ad70>-2.5 E F1(\214lename)
2.5 E F0 2.5(][)C F2(\255dt)-2.5 E F0 2.5(][)C F1(name)-2.5 E F0(])A
.858(Each time)144 513.6 R F2(hash)3.358 E F0 .858(is in)3.358 F -.2(vo)
-.4 G -.1(ke).2 G .858(d, the full pathname of the command).1 F F1(name)
3.718 E F0 .858(is determined by searching)3.538 F .956
(the directories in)144 525.6 R F2($P)3.456 E -.95(AT)-.74 G(H).95 E F0
.956(and remembered.)3.456 F(An)5.956 E 3.456(yp)-.15 G(re)-3.456 E .956
(viously-remembered pathname is discarded.)-.25 F .242(If the)144 537.6
R F2<ad70>2.742 E F0 .243
(option is supplied, no path search is performed, and)2.742 F F1
(\214lename)4.653 E F0 .243(is used as the full \214lename)2.923 F .615
(of the command.)144 549.6 R(The)5.615 E F2<ad72>3.115 E F0 .615
(option causes the shell to for)3.115 F .615
(get all remembered locations.)-.18 F(The)5.615 E F2<ad64>3.115 E F0
(op-)3.115 E .293(tion causes the shell to for)144 561.6 R .293
(get the remembered location of each)-.18 F F1(name)2.794 E F0 5.294(.I)
C 2.794(ft)-5.294 G(he)-2.794 E F2<ad74>2.794 E F0 .294
(option is supplied,)2.794 F .028(the full pathname to which each)144
573.6 R F1(name)2.528 E F0 .028(corresponds is printed.)2.528 F .028
(If multiple)5.028 F F1(name)2.528 E F0(ar)2.528 E .028
(guments are sup-)-.18 F .175(plied with)144 585.6 R F2<ad74>2.675 E F0
2.675(,t)C(he)-2.675 E F1(name)2.675 E F0 .175
(is printed before the hashed full pathname.)2.675 F(The)5.175 E F2
<ad6c>2.676 E F0 .176(option causes output to)2.676 F .783
(be displayed in a format that may be reused as input.)144 597.6 R .783
(If no ar)5.783 F .783(guments are gi)-.18 F -.15(ve)-.25 G .783
(n, or if only).15 F F2<ad6c>3.283 E F0(is)3.283 E .807
(supplied, information about remembered commands is printed.)144 609.6 R
.807(The return status is true unless a)5.807 F F1(name)144.36 621.6 Q
F0(is not found or an in)2.68 E -.25(va)-.4 G(lid option is supplied.)
.25 E F2(help)108 638.4 Q F0([)2.5 E F2(\255dms)A F0 2.5(][)C F1
(pattern)-2.5 E F0(])A .867(Display helpful information about b)144
650.4 R .867(uiltin commands.)-.2 F(If)5.867 E F1(pattern)4.617 E F0
.866(is speci\214ed,)3.607 F F2(help)3.366 E F0(gi)3.366 E -.15(ve)-.25
G 3.366(sd).15 G(etailed)-3.366 E .223(help on all commands matching)144
662.4 R F1(pattern)3.973 E F0 2.723(;o).24 G .223
(therwise help for all the b)-2.723 F .224
(uiltins and shell control struc-)-.2 F(tures is printed.)144 674.4 Q F2
<ad64>144 686.4 Q F0(Display a short description of each)180 686.4 Q F1
(pattern)2.5 E F2<ad6d>144 698.4 Q F0(Display the description of each)
180 698.4 Q F1(pattern)2.5 E F0(in a manpage-lik)2.5 E 2.5(ef)-.1 G
(ormat)-2.5 E F2<ad73>144 710.4 Q F0
(Display only a short usage synopsis for each)180 710.4 Q F1(pattern)2.5
E F0(The return status is 0 unless no command matches)144 727.2 Q F1
(pattern)3.75 E F0(.).24 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235
E(65)190.395 E 0 Cg EP
%%Page: 66 66
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(history [)108 84 Q/F2 10/Times-Italic@0 SF(n)A F1(])A(history \255c)
108 96 Q(history \255d)108 108 Q F2(of)2.5 E(fset)-.18 E F1
(history \255d)108 120 Q F2(start)2.5 E F0<ad>A F2(end)A F1
(history \255anrw)108 132 Q F0([)2.5 E F2(\214lename)A F0(])A F1
(history \255p)108 144 Q F2(ar)2.5 E(g)-.37 E F0([)2.5 E F2(ar)A 2.5(g.)
-.37 G(..)-2.5 E F0(])A F1(history \255s)108 156 Q F2(ar)2.5 E(g)-.37 E
F0([)2.5 E F2(ar)A 2.5(g.)-.37 G(..)-2.5 E F0(])A -.4(Wi)144 168 S .752
(th no options, display the command history list with line numbers.).4 F
.752(Lines listed with a)5.752 F F1(*)3.251 E F0(ha)3.251 E -.15(ve)-.2
G .38(been modi\214ed.)144 180 R .38(An ar)5.38 F .38(gument of)-.18 F
F2(n)3.24 E F0 .38(lists only the last)3.12 F F2(n)3.24 E F0 2.88
(lines. If)3.12 F .38(the shell v)2.88 F(ariable)-.25 E/F3 9
/Times-Bold@0 SF(HISTTIMEFOR-)2.881 E(MA)144 192 Q(T)-.855 E F0 .265
(is set and not null, it is used as a format string for)2.515 F F2
(strftime)2.764 E F0 .264(\(3\) to display the time stamp asso-)B 1.019
(ciated with each displayed history entry)144 204 R 6.019(.N)-.65 G
3.519(oi)-6.019 G(nterv)-3.519 E 1.019
(ening blank is printed between the formatted)-.15 F .176
(time stamp and the history line.)144 216 R(If)5.176 E F2(\214lename)
2.676 E F0 .176
(is supplied, it is used as the name of the history \214le; if)2.676 F
(not, the v)144 228 Q(alue of)-.25 E F3(HISTFILE)2.5 E F0(is used.)2.25
E(Options, if supplied, ha)5 E .3 -.15(ve t)-.2 H(he follo).15 E
(wing meanings:)-.25 E F1<ad63>144 240 Q F0
(Clear the history list by deleting all the entries.)180 240 Q F1<ad64>
144 252 Q F2(of)2.5 E(fset)-.18 E F0 .389
(Delete the history entry at position)180 264 R F2(of)2.889 E(fset)-.18
E F0 5.389(.I)C(f)-5.389 E F2(of)2.889 E(fset)-.18 E F0 .389(is ne)2.889
F -.05(ga)-.15 G(ti).05 E -.15(ve)-.25 G 2.89(,i).15 G 2.89(ti)-2.89 G
2.89(si)-2.89 G .39(nterpreted as relati)-2.89 F -.15(ve)-.25 G .599
(to one greater than the last history position, so ne)180 276 R -.05(ga)
-.15 G(ti).05 E .899 -.15(ve i)-.25 H .598
(ndices count back from the end).15 F(of the history)180 288 Q 2.5(,a)
-.65 G(nd an inde)-2.5 E 2.5(xo)-.15 G 2.5<66ad>-2.5 G 2.5(1r)-2.5 G
(efers to the current)-2.5 E F1(history -d)2.5 E F0(command.)2.5 E F1
<ad64>144 300 Q F2(start)2.5 E F0<ad>A F2(end)A F0 .757
(Delete the history entries between positions)180 312 R F2(start)3.257 E
F0(and)3.258 E F2(end)3.258 E F0 3.258(,i)C(nclusi)-3.258 E -.15(ve)-.25
G 5.758(.P).15 G(ositi)-5.758 E 1.058 -.15(ve a)-.25 H .758(nd ne).15 F
-.05(ga)-.15 G(-).05 E(ti)180 324 Q .3 -.15(ve v)-.25 H(alues for)-.1 E
F2(start)2.5 E F0(and)2.5 E F2(end)2.5 E F0
(are interpreted as described abo)2.5 E -.15(ve)-.15 G(.).15 E F1<ad61>
144 336 Q F0 .565(Append the `)180 336 R(`ne)-.74 E(w')-.25 E 3.065('h)
-.74 G .564(istory lines to the history \214le.)-3.065 F .564
(These are history lines entered since)5.564 F(the be)180 348 Q
(ginning of the current)-.15 E F1(bash)2.5 E F0(session, b)2.5 E
(ut not already appended to the history \214le.)-.2 E F1<ad6e>144 360 Q
F0 .854(Read the history lines not already read from the history \214le\
 into the current history list.)180 360 R .773
(These are lines appended to the history \214le since the be)180 372 R
.772(ginning of the current)-.15 F F1(bash)3.272 E F0(ses-)3.272 E
(sion.)180 384 Q F1<ad72>144 396 Q F0(Read the contents of the history \
\214le and append them to the current history list.)180 396 Q F1<ad77>
144 408 Q F0(Write the current history list to the history \214le, o)180
408 Q -.15(ve)-.15 G(rwriting the history \214le').15 E 2.5(sc)-.55 G
(ontents.)-2.5 E F1<ad70>144 420 Q F0 .625
(Perform history substitution on the follo)180 420 R(wing)-.25 E F2(ar)
3.125 E(gs)-.37 E F0 .626(and display the result on the standard)3.125 F
2.975(output. Does)180 432 R .475
(not store the results in the history list.)2.975 F(Each)5.475 E F2(ar)
2.975 E(g)-.37 E F0 .475(must be quoted to disable)2.975 F
(normal history e)180 444 Q(xpansion.)-.15 E F1<ad73>144 456 Q F0 .362
(Store the)180 456 R F2(ar)3.192 E(gs)-.37 E F0 .363
(in the history list as a single entry)3.132 F 5.363(.T)-.65 G .363
(he last command in the history list is)-5.363 F(remo)180 468 Q -.15(ve)
-.15 G 2.5(db).15 G(efore the)-2.5 E F2(ar)2.83 E(gs)-.37 E F0
(are added.)2.77 E .146(If the)144 484.8 R F3(HISTTIMEFORMA)2.645 E(T)
-.855 E F0 -.25(va)2.395 G .145
(riable is set, the time stamp information associated with each history)
.25 F .668(entry is written to the history \214le, mark)144 496.8 R .669
(ed with the history comment character)-.1 F 5.669(.W)-.55 G .669
(hen the history)-5.669 F .956(\214le is read, lines be)144 508.8 R .956
(ginning with the history comment character follo)-.15 F .955
(wed immediately by a digit)-.25 F .832
(are interpreted as timestamps for the follo)144 520.8 R .832
(wing history entry)-.25 F 5.833(.T)-.65 G .833(he return v)-5.833 F
.833(alue is 0 unless an in-)-.25 F -.25(va)144 532.8 S .168(lid option\
 is encountered, an error occurs while reading or writing the history \
\214le, an in).25 F -.25(va)-.4 G(lid).25 E F2(of)2.668 E(f-)-.18 E(set)
144 544.8 Q F0(is supplied as an ar)2.5 E(gument to)-.18 E F1<ad64>2.5 E
F0 2.5(,o)C 2.5(rt)-2.5 G(he history e)-2.5 E
(xpansion supplied as an ar)-.15 E(gument to)-.18 E F1<ad70>2.5 E F0 -.1
(fa)2.5 G(ils.).1 E F1(jobs)108 561.6 Q F0([)2.5 E F1(\255lnprs)A F0 2.5
(][)C F2(jobspec)A F0(... ])2.5 E F1(jobs \255x)108 573.6 Q F2(command)
2.5 E F0([)2.5 E F2(ar)2.5 E(gs)-.37 E F0(... ])2.5 E
(The \214rst form lists the acti)144 585.6 Q .3 -.15(ve j)-.25 H 2.5
(obs. The).15 F(options ha)2.5 E .3 -.15(ve t)-.2 H(he follo).15 E
(wing meanings:)-.25 E F1<ad6c>144 597.6 Q F0
(List process IDs in addition to the normal information.)180 597.6 Q F1
<ad6e>144 609.6 Q F0 .193(Display information only about jobs that ha)
180 609.6 R .494 -.15(ve c)-.2 H .194(hanged status since the user w).15
F .194(as last noti-)-.1 F(\214ed of their status.)180 621.6 Q F1<ad70>
144 633.6 Q F0(List only the process ID of the job')180 633.6 Q 2.5(sp)
-.55 G(rocess group leader)-2.5 E(.)-.55 E F1<ad72>144 645.6 Q F0
(Display only running jobs.)180 645.6 Q F1<ad73>144 657.6 Q F0
(Display only stopped jobs.)180 657.6 Q(If)144 674.4 Q F2(jobspec)4.554
E F0 .314(is gi)3.124 F -.15(ve)-.25 G .314
(n, output is restricted to information about that job).15 F 5.313(.T)
-.4 G .313(he return status is 0 unless)-5.313 F(an in)144 686.4 Q -.25
(va)-.4 G(lid option is encountered or an in).25 E -.25(va)-.4 G(lid).25
E F2(jobspec)4.24 E F0(is supplied.)2.81 E .394(If the)144 703.2 R F1
<ad78>2.894 E F0 .394(option is supplied,)2.894 F F1(jobs)2.894 E F0
.394(replaces an)2.894 F(y)-.15 E F2(jobspec)4.634 E F0 .394(found in)
3.204 F F2(command)3.094 E F0(or)3.664 E F2(ar)3.224 E(gs)-.37 E F0 .395
(with the corre-)3.164 F(sponding process group ID, and e)144 715.2 Q
-.15(xe)-.15 G(cutes).15 E F2(command)2.7 E F0(passing it)3.27 E F2(ar)
2.83 E(gs)-.37 E F0 2.5(,r).27 G(eturning its e)-2.5 E(xit status.)-.15
E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(66)190.395 E 0 Cg EP
%%Page: 67 67
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(kill)108 84 Q F0([)2.5 E F1<ad73>A/F2 10/Times-Italic@0 SF(sigspec)
2.5 E F0(|)2.5 E F1<ad6e>2.5 E F2(signum)2.5 E F0(|)2.5 E F1<ad>2.5 E F2
(sigspec)A F0 2.5(][)C F2(pid)-2.5 E F0(|)2.5 E F2(jobspec)2.5 E F0 2.5
(].)C(..)-2.5 E F1(kill \255l)108 96 Q F0(|)A F1<ad4c>A F0([)2.5 E F2
(sigspec)A F0(|)2.5 E F2 -.2(ex)2.5 G(it_status).2 E F0(])A .017
(Send the signal named by)144 108 R F2(sigspec)2.857 E F0(or)2.827 E F2
(signum)2.857 E F0 .017(to the processes named by)2.837 F F2(pid)3.767 E
F0(or)3.287 E F2(jobspec)4.257 E F0(.).31 E F2(sigspec)5.357 E F0(is)
2.827 E .318(either a case-insensiti)144 120 R .618 -.15(ve s)-.25 H
.318(ignal name such as).15 F/F3 9/Times-Bold@0 SF(SIGKILL)2.818 E F0
.319(\(with or without the)2.569 F F3(SIG)2.819 E F0 .319
(pre\214x\) or a signal)2.569 F(number;)144 132 Q F2(signum)3.268 E F0
.427(is a signal number)3.247 F 5.427(.I)-.55 G(f)-5.427 E F2(sigspec)
3.267 E F0 .427(is not present, then)3.237 F F3(SIGTERM)2.927 E F0 .427
(is assumed.)2.677 F .427(An ar)5.427 F(-)-.2 E .313(gument of)144 144 R
F1<ad6c>2.813 E F0 .314(lists the signal names.)2.814 F .314(If an)5.314
F 2.814(ya)-.15 G -.18(rg)-2.814 G .314(uments are supplied when).18 F
F1<ad6c>2.814 E F0 .314(is gi)2.814 F -.15(ve)-.25 G .314
(n, the names of).15 F .12(the signals corresponding to the ar)144 156 R
.119(guments are listed, and the return status is 0.)-.18 F(The)5.119 E
F2 -.2(ex)2.619 G(it_status).2 E F0(ar)2.619 E(-)-.2 E .799(gument to)
144 168 R F1<ad6c>3.299 E F0 .799
(is a number specifying either a signal number or the e)3.299 F .8
(xit status of a process termi-)-.15 F .963(nated by a signal.)144 180 R
(The)5.962 E F1<ad4c>3.462 E F0 .962(option is equi)3.462 F -.25(va)-.25
G .962(lent to).25 F F1<ad6c>3.462 E F0(.)A F1(kill)5.962 E F0 .962
(returns true if at least one signal w)3.462 F(as)-.1 E
(successfully sent, or f)144 192 Q(alse if an error occurs or an in)-.1
E -.25(va)-.4 G(lid option is encountered.).25 E F1(let)108 208.8 Q F2
(ar)2.5 E(g)-.37 E F0([)2.5 E F2(ar)A(g)-.37 E F0(...])2.5 E(Each)144
220.8 Q F2(ar)3.026 E(g)-.37 E F0 .196(is an arithmetic e)2.916 F .197
(xpression to be e)-.15 F -.25(va)-.25 G .197(luated \(see).25 F F3 .197
(ARITHMETIC EV)2.697 F(ALU)-1.215 E -.855(AT)-.54 G(ION).855 E F0(abo)
2.447 E -.15(ve)-.15 G 2.697(\). If).15 F(the last)144 232.8 Q F2(ar)
2.83 E(g)-.37 E F0 -.25(eva)2.72 G(luates to 0,).25 E F1(let)2.5 E F0
(returns 1; 0 is returned otherwise.)2.5 E F1(local)108 249.6 Q F0([)2.5
E F2(option)A F0 2.5(][)C F2(name)-2.5 E F0([=)A F2(value)A F0 2.5(].)C
(.. | \255 ])-2.5 E -.15(Fo)144 261.6 S 2.542(re).15 G .042(ach ar)
-2.542 F .042(gument, a local v)-.18 F .042(ariable named)-.25 F F2
(name)2.902 E F0 .042(is created, and assigned)2.722 F F2(value)2.832 E
F0 5.042(.T).18 G(he)-5.042 E F2(option)2.542 E F0 .041(can be)2.541 F
(an)144 273.6 Q 3.152(yo)-.15 G 3.152(ft)-3.152 G .652
(he options accepted by)-3.152 F F1(declar)3.152 E(e)-.18 E F0 5.652(.W)
C(hen)-5.652 E F1(local)3.152 E F0 .653
(is used within a function, it causes the v)3.152 F(ari-)-.25 E(able)144
285.6 Q F2(name)3.282 E F0 .422(to ha)3.102 F .722 -.15(ve a v)-.2 H
.422(isible scope restricted to that function and its children.).15 F
(If)5.421 E F2(name)2.921 E F0 .421(is \255, the set)2.921 F .509
(of shell options is made local to the function in which)144 297.6 R F1
(local)3.01 E F0 .51(is in)3.01 F -.2(vo)-.4 G -.1(ke).2 G .51
(d: shell options changed us-).1 F 1.171(ing the)144 309.6 R F1(set)
3.671 E F0 -.2(bu)3.671 G 1.171
(iltin inside the function are restored to their original v).2 F 1.17
(alues when the function re-)-.25 F 3.38(turns. The)144 321.6 R .88
(restore is ef)3.38 F .88(fected as if a series of)-.25 F F1(set)3.381 E
F0 .881(commands were e)3.381 F -.15(xe)-.15 G .881
(cuted to restore the v).15 F(alues)-.25 E .788
(that were in place before the function.)144 333.6 R -.4(Wi)5.788 G .788
(th no operands,).4 F F1(local)3.288 E F0 .787(writes a list of local v)
3.288 F .787(ariables to)-.25 F .654(the standard output.)144 345.6 R
.654(It is an error to use)5.654 F F1(local)3.154 E F0 .654
(when not within a function.)3.154 F .655(The return status is 0)5.654 F
(unless)144 357.6 Q F1(local)2.5 E F0(is used outside a function, an in)
2.5 E -.25(va)-.4 G(lid).25 E F2(name)2.86 E F0(is supplied, or)2.68 E
F2(name)2.5 E F0(is a readonly v)2.5 E(ariable.)-.25 E F1(logout)108
374.4 Q F0(Exit a login shell.)144 374.4 Q F1(map\214le)108 391.2 Q F0
([)2.5 E F1<ad64>A F2(delim)2.5 E F0 2.5(][)C F1<ad6e>-2.5 E F2(count)
2.5 E F0 2.5(][)C F1<ad4f>-2.5 E F2(origin)2.5 E F0 2.5(][)C F1<ad73>
-2.5 E F2(count)2.5 E F0 2.5(][)C F1<ad74>-2.5 E F0 2.5(][)C F1<ad75>
-2.5 E F2(fd)2.5 E F0 2.5(][)C F1<ad43>-2.5 E F2(callbac)2.5 E(k)-.2 E
F0 2.5(][)C F1<ad63>-2.5 E F2(quantum)2.5 E F0 2.5(][)C F2(arr)-2.5 E
(ay)-.15 E F0(])A F1 -.18(re)108 403.2 S(adarray).18 E F0([)2.5 E F1
<ad64>A F2(delim)2.5 E F0 2.5(][)C F1<ad6e>-2.5 E F2(count)2.5 E F0 2.5
(][)C F1<ad4f>-2.5 E F2(origin)2.5 E F0 2.5(][)C F1<ad73>-2.5 E F2
(count)2.5 E F0 2.5(][)C F1<ad74>-2.5 E F0 2.5(][)C F1<ad75>-2.5 E F2
(fd)2.5 E F0 2.5(][)C F1<ad43>-2.5 E F2(callbac)2.5 E(k)-.2 E F0 2.5(][)
C F1<ad63>-2.5 E F2(quantum)2.5 E F0 2.5(][)C F2(arr)-2.5 E(ay)-.15 E F0
(])A .159(Read lines from the standard input into the inde)144 415.2 R
-.15(xe)-.15 G 2.659(da).15 G .159(rray v)-2.659 F(ariable)-.25 E F2
(arr)2.989 E(ay)-.15 E F0 2.659(,o).32 G 2.658(rf)-2.659 G .158
(rom \214le descriptor)-2.658 F F2(fd)4.628 E F0 1.248(if the)144 427.2
R F1<ad75>3.748 E F0 1.248(option is supplied.)3.748 F 1.249(The v)6.249
F(ariable)-.25 E F3(MAPFILE)3.749 E F0 1.249(is the def)3.499 F(ault)-.1
E F2(arr)3.749 E(ay)-.15 E F0 6.249(.O)C 1.249(ptions, if supplied,)
-6.249 F(ha)144 439.2 Q .3 -.15(ve t)-.2 H(he follo).15 E
(wing meanings:)-.25 E F1<ad64>144 451.2 Q F0 .911
(The \214rst character of)180 451.2 R F2(delim)3.411 E F0 .911
(is used to terminate each input line, rather than ne)3.411 F 3.41
(wline. If)-.25 F F2(delim)180 463.2 Q F0(is the empty string,)2.5 E F1
(map\214le)2.5 E F0(will terminate a line when it reads a NUL character)
2.5 E(.)-.55 E F1<ad6e>144 475.2 Q F0(Cop)180 475.2 Q 2.5(ya)-.1 G 2.5
(tm)-2.5 G(ost)-2.5 E F2(count)2.7 E F0 2.5(lines. If)3.18 F F2(count)
2.5 E F0(is 0, all lines are copied.)2.5 E F1<ad4f>144 487.2 Q F0(Be)180
487.2 Q(gin assigning to)-.15 E F2(arr)2.83 E(ay)-.15 E F0(at inde)2.82
E(x)-.15 E F2(origin)2.73 E F0 5(.T).24 G(he def)-5 E(ault inde)-.1 E
2.5(xi)-.15 G 2.5(s0)-2.5 G(.)-2.5 E F1<ad73>144 499.2 Q F0
(Discard the \214rst)180 499.2 Q F2(count)2.5 E F0(lines read.)2.5 E F1
<ad74>144 511.2 Q F0(Remo)180 511.2 Q .3 -.15(ve a t)-.15 H(railing).15
E F2(delim)2.5 E F0(\(def)2.5 E(ault ne)-.1 E
(wline\) from each line read.)-.25 E F1<ad75>144 523.2 Q F0
(Read lines from \214le descriptor)180 523.2 Q F2(fd)2.5 E F0
(instead of the standard input.)2.5 E F1<ad43>144 535.2 Q F0(Ev)180
535.2 Q(aluate)-.25 E F2(callbac)2.7 E(k)-.2 E F0(each time)3.17 E F2
(quantum)2.5 E F0(lines are read.)2.5 E(The)5 E F1<ad63>2.5 E F0
(option speci\214es)2.5 E F2(quantum)2.75 E F0(.).32 E F1<ad63>144 547.2
Q F0(Specify the number of lines read between each call to)180 547.2 Q
F2(callbac)2.7 E(k)-.2 E F0(.).67 E(If)144 564 Q F1<ad43>2.967 E F0 .467
(is speci\214ed without)2.967 F F1<ad63>2.967 E F0 2.967(,t)C .467
(he def)-2.967 F .467(ault quantum is 5000.)-.1 F(When)5.467 E F2
(callbac)2.967 E(k)-.2 E F0 .467(is e)2.967 F -.25(va)-.25 G .467
(luated, it is sup-).25 F .262(plied the inde)144 576 R 2.762(xo)-.15 G
2.762(ft)-2.762 G .262(he ne)-2.762 F .261(xt array element to be assig\
ned and the line to be assigned to that element)-.15 F .274
(as additional ar)144 588 R(guments.)-.18 E F2(callbac)5.274 E(k)-.2 E
F0 .274(is e)2.774 F -.25(va)-.25 G .274
(luated after the line is read b).25 F .275
(ut before the array element is)-.2 F(assigned.)144 600 Q
(If not supplied with an e)144 616.8 Q(xplicit origin,)-.15 E F1
(map\214le)2.5 E F0(will clear)2.5 E F2(arr)2.5 E(ay)-.15 E F0
(before assigning to it.)2.5 E F1(map\214le)144 633.6 Q F0 .797
(returns successfully unless an in)3.298 F -.25(va)-.4 G .797
(lid option or option ar).25 F .797(gument is supplied,)-.18 F F2(arr)
3.297 E(ay)-.15 E F0 .797(is in-)3.297 F -.25(va)144 645.6 S
(lid or unassignable, or if).25 E F2(arr)2.5 E(ay)-.15 E F0
(is not an inde)2.5 E -.15(xe)-.15 G 2.5(da).15 G(rray)-2.5 E(.)-.65 E
F1(popd)108 662.4 Q F0<5bad>2.5 E F1(n)A F0 2.5(][)C(+)-2.5 E F2(n)A F0
2.5(][)C<ad>-2.5 E F2(n)A F0(])A(Remo)144 674.4 Q -.15(ve)-.15 G 2.799
(se).15 G .299(ntries from the directory stack.)-2.799 F -.4(Wi)5.299 G
.299(th no ar).4 F .299(guments, remo)-.18 F -.15(ve)-.15 G 2.799(st).15
G .3(he top directory from the)-2.799 F 1.479(stack, and performs a)144
686.4 R F1(cd)3.979 E F0 1.479(to the ne)3.979 F 3.979(wt)-.25 G 1.479
(op directory)-3.979 F 6.479(.A)-.65 G -.18(rg)-6.479 G 1.478
(uments, if supplied, ha).18 F 1.778 -.15(ve t)-.2 H 1.478(he follo).15
F(wing)-.25 E(meanings:)144 698.4 Q F1<ad6e>144 710.4 Q F0 .551
(Suppresses the normal change of directory when remo)180 710.4 R .551
(ving directories from the stack, so)-.15 F
(that only the stack is manipulated.)180 722.4 Q(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(67)190.395 E 0 Cg EP
%%Page: 68 68
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(+)144 84 Q/F2 10/Times-Italic@0 SF(n)A F0(Remo)180 84 Q -.15(ve)-.15
G 2.64(st).15 G(he)-2.64 E F2(n)2.64 E F0 .14
(th entry counting from the left of the list sho)B .14(wn by)-.25 F F1
(dirs)2.64 E F0 2.64(,s)C .14(tarting with zero.)-2.64 F -.15(Fo)180 96
S 2.5(re).15 G(xample:)-2.65 E/F3 10/Courier@0 SF(popd +0)2.5 E F0(remo)
2.5 E -.15(ve)-.15 G 2.5(st).15 G(he \214rst directory)-2.5 E(,)-.65 E
F3(popd +1)2.5 E F0(the second.)2.5 E F1<ad>144 108 Q F2(n)A F0(Remo)180
108 Q -.15(ve)-.15 G 3.759(st).15 G(he)-3.759 E F2(n)3.759 E F0 1.259
(th entry counting from the right of the list sho)B 1.26(wn by)-.25 F F1
(dirs)3.76 E F0 3.76(,s)C 1.26(tarting with)-3.76 F 2.5(zero. F)180 120
R(or e)-.15 E(xample:)-.15 E F3(popd -0)2.5 E F0(remo)2.5 E -.15(ve)-.15
G 2.5(st).15 G(he last directory)-2.5 E(,)-.65 E F3(popd -1)2.5 E F0
(the ne)2.5 E(xt to last.)-.15 E .644(If the)144 136.8 R F1(popd)3.144 E
F0 .644(command is successful, a)3.144 F F1(dirs)3.143 E F0 .643
(is performed as well, and the return status is 0.)3.143 F F1(popd)5.643
E F0 .415(returns f)144 148.8 R .415(alse if an in)-.1 F -.25(va)-.4 G
.415(lid option is encountered, the directory stack is empty).25 F 2.916
(,an)-.65 G(on-e)-2.916 E .416(xistent direc-)-.15 F
(tory stack entry is speci\214ed, or the directory change f)144 160.8 Q
(ails.)-.1 E F1(printf)108 177.6 Q F0([)2.5 E F1<ad76>A F2(var)2.5 E F0
(])A F2(format)2.5 E F0([)2.5 E F2(ar)A(guments)-.37 E F0(])A .358
(Write the formatted)144 189.6 R F2(ar)2.858 E(guments)-.37 E F0 .358
(to the standard output under the control of the)2.858 F F2(format)2.857
E F0 5.357(.T)C(he)-5.357 E F1<ad76>2.857 E F0(op-)2.857 E .714
(tion causes the output to be assigned to the v)144 201.6 R(ariable)-.25
E F2(var)3.214 E F0 .714(rather than being printed to the standard)3.214
F(output.)144 213.6 Q(The)144 237.6 Q F2(format)3.018 E F0 .517(is a ch\
aracter string which contains three types of objects: plain characters,\
 which are)3.018 F .704(simply copied to standard output, character esc\
ape sequences, which are con)144 249.6 R -.15(ve)-.4 G .704
(rted and copied to).15 F .036(the standard output, and format speci\
\214cations, each of which causes printing of the ne)144 261.6 R .036
(xt successi)-.15 F -.15(ve)-.25 G F2(ar)144 273.6 Q(gument)-.37 E F0
5.531(.I)C 3.031(na)-5.531 G .531(ddition to the standard)-3.031 F F2
(printf)3.032 E F0 .532(\(1\) format speci\214cations,)B F1(printf)3.032
E F0 .532(interprets the follo)3.032 F(w-)-.25 E(ing e)144 285.6 Q
(xtensions:)-.15 E F1(%b)144 297.6 Q F0(causes)180 297.6 Q F1(printf)
2.596 E F0 .096(to e)2.596 F .096
(xpand backslash escape sequences in the corresponding)-.15 F F2(ar)
2.596 E(gument)-.37 E F0 .095(in the)2.595 F(same w)180 309.6 Q(ay as)
-.1 E F1(echo \255e)2.5 E F0(.)A F1(%q)144 321.6 Q F0(causes)180 321.6 Q
F1(printf)2.51 E F0 .01(to output the corresponding)2.51 F F2(ar)2.51 E
(gument)-.37 E F0 .01(in a format that can be reused as shell)2.51 F
(input.)180 333.6 Q F1(%\()144 345.6 Q F2(datefmt)A F1(\)T)A F0(causes)
180 357.6 Q F1(printf)4.404 E F0 1.904
(to output the date-time string resulting from using)4.404 F F2(datefmt)
4.404 E F0 1.903(as a format)4.404 F .38(string for)180 369.6 R F2
(strftime)2.881 E F0 2.881(\(3\). The)B(corresponding)2.881 E F2(ar)
2.881 E(gument)-.37 E F0 .381(is an inte)2.881 F .381
(ger representing the number)-.15 F .293(of seconds since the epoch.)180
381.6 R -1 -.8(Tw o)5.293 H .293(special ar)3.593 F .293(gument v)-.18 F
.293(alues may be used: \2551 represents the)-.25 F .693
(current time, and \2552 represents the time the shell w)180 393.6 R
.693(as in)-.1 F -.2(vo)-.4 G -.1(ke).2 G 3.194(d. If).1 F .694(no ar)
3.194 F .694(gument is speci-)-.18 F .21(\214ed, con)180 405.6 R -.15
(ve)-.4 G .21(rsion beha).15 F -.15(ve)-.2 G 2.71(sa).15 G 2.71(si)-2.71
G 2.71<66ad>-2.71 G 2.71(1h)-2.71 G .21(ad been gi)-2.71 F -.15(ve)-.25
G 2.71(n. This).15 F .21(is an e)2.71 F .21(xception to the usual)-.15 F
F1(printf)2.71 E F0(beha)180 417.6 Q(vior)-.2 E(.)-.55 E .901
(The %b, %q, and %T directi)144 434.4 R -.15(ve)-.25 G 3.401(sa).15 G
.901(ll use the \214eld width and precision ar)-3.401 F .902
(guments from the format)-.18 F .358(speci\214cation and write that man)
144 446.4 R 2.858(yb)-.15 G .357
(ytes from \(or use that wide a \214eld for\) the e)-2.858 F .357
(xpanded ar)-.15 F(gument,)-.18 E
(which usually contains more characters than the original.)144 458.4 Q
(Ar)144 475.2 Q .463(guments to non-string format speci\214ers are trea\
ted as C constants, e)-.18 F .464(xcept that a leading plus or)-.15 F
1.259(minus sign is allo)144 487.2 R 1.259
(wed, and if the leading character is a single or double quote, the v)
-.25 F 1.258(alue is the)-.25 F(ASCII v)144 499.2 Q(alue of the follo)
-.25 E(wing character)-.25 E(.)-.55 E(The)144 516 Q F2(format)2.514 E F0
.015(is reused as necessary to consume all of the)2.514 F F2(ar)2.515 E
(guments)-.37 E F0 5.015(.I)C 2.515(ft)-5.015 G(he)-2.515 E F2(format)
2.515 E F0 .015(requires more)2.515 F F2(ar)2.515 E(-)-.2 E(guments)144
528 Q F0 .566(than are supplied, the e)3.066 F .566
(xtra format speci\214cations beha)-.15 F .866 -.15(ve a)-.2 H 3.066(si)
.15 G 3.065(faz)-3.066 G .565(ero v)-3.065 F .565(alue or null string,)
-.25 F(as appropriate, had been supplied.)144 540 Q(The return v)5 E
(alue is zero on success, non-zero on f)-.25 E(ailure.)-.1 E F1(pushd)
108 556.8 Q F0([)2.5 E F1<ad6e>A F0 2.5(][)C(+)-2.5 E F2(n)A F0 2.5(][)C
<ad>-2.5 E F2(n)A F0(])A F1(pushd)108 568.8 Q F0([)2.5 E F1<ad6e>A F0
2.5(][)C F2(dir)-2.5 E F0(])A .639(Adds a directory to the top of the d\
irectory stack, or rotates the stack, making the ne)144 580.8 R 3.14(wt)
-.25 G .64(op of the)-3.14 F .417(stack the current w)144 592.8 R .416
(orking directory)-.1 F 5.416(.W)-.65 G .416(ith no ar)-5.816 F
(guments,)-.18 E F1(pushd)2.916 E F0 -.15(ex)2.916 G .416
(changes the top tw).15 F 2.916(od)-.1 G(irectories)-2.916 E 1.625
(and returns 0, unless the directory stack is empty)144 604.8 R 6.625
(.A)-.65 G -.18(rg)-6.625 G 1.625(uments, if supplied, ha).18 F 1.925
-.15(ve t)-.2 H 1.625(he follo).15 F(wing)-.25 E(meanings:)144 616.8 Q
F1<ad6e>144 628.8 Q F0 1.811(Suppresses the normal change of directory \
when rotating or adding directories to the)180 628.8 R
(stack, so that only the stack is manipulated.)180 640.8 Q F1(+)144
652.8 Q F2(n)A F0 1.267(Rotates the stack so that the)180 652.8 R F2(n)
3.767 E F0 1.268(th directory \(counting from the left of the list sho)B
1.268(wn by)-.25 F F1(dirs)180 664.8 Q F0 2.5(,s)C
(tarting with zero\) is at the top.)-2.5 E F1<ad>144 676.8 Q F2(n)A F0
.92(Rotates the stack so that the)180 676.8 R F2(n)3.42 E F0 .92
(th directory \(counting from the right of the list sho)B .92(wn by)-.25
F F1(dirs)180 688.8 Q F0 2.5(,s)C(tarting with zero\) is at the top.)
-2.5 E F2(dir)144.35 700.8 Q F0(Adds)180 700.8 Q F2(dir)3.137 E F0 .287
(to the directory stack at the top, making it the ne)3.517 F 2.788(wc)
-.25 G .288(urrent w)-2.788 F .288(orking directory as)-.1 F
(if it had been supplied as the ar)180 712.8 Q(gument to the)-.18 E F1
(cd)2.5 E F0 -.2(bu)2.5 G(iltin.).2 E .489(If the)144 729.6 R F1(pushd)
2.989 E F0 .489(command is successful, a)2.989 F F1(dirs)2.988 E F0 .488
(is performed as well.)2.988 F .488(If the \214rst form is used,)5.488 F
F1(pushd)2.988 E F0(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(68)
190.395 E 0 Cg EP
%%Page: 69 69
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E 1.039
(returns 0 unless the cd to)144 84 R/F1 10/Times-Italic@0 SF(dir)3.889 E
F0 -.1(fa)4.269 G 3.539(ils. W).1 F 1.039(ith the second form,)-.4 F/F2
10/Times-Bold@0 SF(pushd)3.54 E F0 1.04(returns 0 unless the directory)
3.54 F .847(stack is empty)144 96 R 3.347(,an)-.65 G(on-e)-3.347 E .847
(xistent directory stack element is speci\214ed, or the directory chang\
e to the)-.15 F(speci\214ed ne)144 108 Q 2.5(wc)-.25 G
(urrent directory f)-2.5 E(ails.)-.1 E F2(pwd)108 124.8 Q F0([)2.5 E F2
(\255LP)A F0(])A .844(Print the absolute pathname of the current w)144
136.8 R .845(orking directory)-.1 F 5.845(.T)-.65 G .845
(he pathname printed contains no)-5.845 F .182(symbolic links if the)144
148.8 R F2<ad50>2.681 E F0 .181(option is supplied or the)2.681 F F2
.181(\255o ph)2.681 F(ysical)-.15 E F0 .181(option to the)2.681 F F2
(set)2.681 E F0 -.2(bu)2.681 G .181(iltin command is).2 F 3.263
(enabled. If)144 160.8 R(the)3.263 E F2<ad4c>3.263 E F0 .763
(option is used, the pathname printed may contain symbolic links.)3.263
F .764(The return)5.764 F .405(status is 0 unless an error occurs while\
 reading the name of the current directory or an in)144 172.8 R -.25(va)
-.4 G .405(lid op-).25 F(tion is supplied.)144 184.8 Q F2 -.18(re)108
201.6 S(ad).18 E F0([)3.816 E F2(\255ers)A F0 3.816(][)C F2<ad61>-3.816
E F1(aname)3.816 E F0 3.816(][)C F2<ad64>-3.816 E F1(delim)3.816 E F0
3.816(][)C F2<ad69>-3.816 E F1(te)3.816 E(xt)-.2 E F0 3.816(][)C F2
<ad6e>-3.816 E F1(nc)3.816 E(har)-.15 E(s)-.1 E F0 3.817(][)C F2<ad4e>
-3.817 E F1(nc)3.817 E(har)-.15 E(s)-.1 E F0 3.817(][)C F2<ad70>-3.817 E
F1(pr)3.817 E(ompt)-.45 E F0 3.817(][)C F2<ad74>-3.817 E F1(timeout)
3.817 E F0 3.817(][)C F2<ad75>-3.817 E F1(fd)3.817 E F0(])A([)108 213.6
Q F1(name)A F0(...])2.5 E .516(One line is read from the standard input\
, or from the \214le descriptor)144 225.6 R F1(fd)3.016 E F0 .516
(supplied as an ar)3.016 F .516(gument to)-.18 F(the)144 237.6 Q F2
<ad75>2.935 E F0 .435(option, split into w)2.935 F .435
(ords as described abo)-.1 F .735 -.15(ve u)-.15 H(nder).15 E F2 -.75
(Wo)2.935 G .435(rd Splitting).75 F F0 2.935(,a)C .436(nd the \214rst w)
-2.935 F .436(ord is as-)-.1 F .376(signed to the \214rst)144 249.6 R F1
(name)3.236 E F0 2.876(,t).18 G .376(he second w)-2.876 F .376
(ord to the second)-.1 F F1(name)3.236 E F0 2.876(,a).18 G .376
(nd so on.)-2.876 F .375(If there are more w)5.376 F(ords)-.1 E .236
(than names, the remaining w)144 261.6 R .237(ords and their interv)-.1
F .237(ening delimiters are assigned to the last)-.15 F F1(name)3.097 E
F0 5.237(.I).18 G(f)-5.237 E .875(there are fe)144 273.6 R .875(wer w)
-.25 F .875(ords read from the input stream than names, the remaining n\
ames are assigned)-.1 F .517(empty v)144 285.6 R 3.017(alues. The)-.25 F
.517(characters in)3.017 F/F3 9/Times-Bold@0 SF(IFS)3.017 E F0 .518
(are used to split the line into w)2.767 F .518
(ords using the same rules the)-.1 F .027(shell uses for e)144 297.6 R
.026(xpansion \(described abo)-.15 F .326 -.15(ve u)-.15 H(nder).15 E F2
-.75(Wo)2.526 G .026(rd Splitting).75 F F0 2.526(\). The)B .026
(backslash character \()2.526 F F2(\\)A F0 2.526(\)m)C(ay)-2.526 E .488
(be used to remo)144 309.6 R .788 -.15(ve a)-.15 H .788 -.15(ny s).15 H
.488(pecial meaning for the ne).15 F .488
(xt character read and for line continuation.)-.15 F(Op-)5.489 E
(tions, if supplied, ha)144 321.6 Q .3 -.15(ve t)-.2 H(he follo).15 E
(wing meanings:)-.25 E F2<ad61>144 333.6 Q F1(aname)2.5 E F0 1.026
(The w)180 345.6 R 1.026
(ords are assigned to sequential indices of the array v)-.1 F(ariable)
-.25 E F1(aname)3.855 E F0 3.525(,s).18 G 1.025(tarting at 0.)-3.525 F
F1(aname)180.33 357.6 Q F0(is unset before an)2.68 E 2.5(yn)-.15 G .5
-.25(ew va)-2.5 H(lues are assigned.).25 E(Other)5 E F1(name)2.5 E F0
(ar)2.5 E(guments are ignored.)-.18 E F2<ad64>144 369.6 Q F1(delim)2.5 E
F0 .28(The \214rst character of)180 381.6 R F1(delim)2.78 E F0 .281
(is used to terminate the input line, rather than ne)2.78 F 2.781
(wline. If)-.25 F F1(de-)2.781 E(lim)180 393.6 Q F0
(is the empty string,)2.5 E F2 -.18(re)2.5 G(ad).18 E F0
(will terminate a line when it reads a NUL character)2.5 E(.)-.55 E F2
<ad65>144 405.6 Q F0 .373
(If the standard input is coming from a terminal,)180 405.6 R F2 -.18
(re)2.873 G(adline).18 E F0(\(see)2.873 E F3(READLINE)2.872 E F0(abo)
2.622 E -.15(ve)-.15 G 2.872(\)i).15 G 2.872(su)-2.872 G(sed)-2.872 E
.218(to obtain the line.)180 417.6 R .218
(Readline uses the current \(or def)5.218 F .218
(ault, if line editing w)-.1 F .218(as not pre)-.1 F(viously)-.25 E
(acti)180 429.6 Q -.15(ve)-.25 G 2.5(\)e).15 G(diting settings, b)-2.5 E
(ut uses Readline')-.2 E 2.5(sd)-.55 G(ef)-2.5 E
(ault \214lename completion.)-.1 E F2<ad69>144 441.6 Q F1(te)2.5 E(xt)
-.2 E F0(If)180 441.6 Q F2 -.18(re)2.716 G(adline).18 E F0 .216
(is being used to read the line,)2.716 F F1(te)2.716 E(xt)-.2 E F0 .216
(is placed into the editing b)2.716 F(uf)-.2 E .215(fer before edit-)
-.25 F(ing be)180 453.6 Q(gins.)-.15 E F2<ad6e>144 465.6 Q F1(nc)2.5 E
(har)-.15 E(s)-.1 E F2 -.18(re)180 477.6 S(ad).18 E F0 .322
(returns after reading)2.822 F F1(nc)2.823 E(har)-.15 E(s)-.1 E F0 .323
(characters rather than w)2.823 F .323
(aiting for a complete line of in-)-.1 F(put, b)180 489.6 Q
(ut honors a delimiter if fe)-.2 E(wer than)-.25 E F1(nc)2.5 E(har)-.15
E(s)-.1 E F0(characters are read before the delimiter)2.5 E(.)-.55 E F2
<ad4e>144 501.6 Q F1(nc)2.5 E(har)-.15 E(s)-.1 E F2 -.18(re)180 513.6 S
(ad).18 E F0 1.269(returns after reading e)3.77 F(xactly)-.15 E F1(nc)
3.769 E(har)-.15 E(s)-.1 E F0 1.269(characters rather than w)3.769 F
1.269(aiting for a complete)-.1 F .274
(line of input, unless EOF is encountered or)180 525.6 R F2 -.18(re)
2.775 G(ad).18 E F0 .275(times out.)2.775 F .275
(Delimiter characters encoun-)5.275 F 1.003
(tered in the input are not treated specially and do not cause)180 537.6
R F2 -.18(re)3.502 G(ad).18 E F0 1.002(to return until)3.502 F F1(nc)
3.502 E(har)-.15 E(s)-.1 E F0 .608(characters are read.)180 549.6 R .608
(The result is not split on the characters in)5.608 F F2(IFS)3.108 E F0
3.108(;t)C .609(he intent is that the)-3.108 F -.25(va)180 561.6 S .67
(riable is assigned e).25 F .669
(xactly the characters read \(with the e)-.15 F .669
(xception of backslash; see the)-.15 F F2<ad72>180 573.6 Q F0
(option belo)2.5 E(w\).)-.25 E F2<ad70>144 585.6 Q F1(pr)2.5 E(ompt)-.45
E F0(Display)180 597.6 Q F1(pr)3.66 E(ompt)-.45 E F0 1.161
(on standard error)3.66 F 3.661(,w)-.4 G 1.161(ithout a trailing ne)
-3.661 F 1.161(wline, before attempting to read)-.25 F(an)180 609.6 Q
2.5(yi)-.15 G 2.5(nput. The)-2.5 F
(prompt is displayed only if input is coming from a terminal.)2.5 E F2
<ad72>144 621.6 Q F0 .544(Backslash does not act as an escape character)
180 621.6 R 5.543(.T)-.55 G .543
(he backslash is considered to be part of)-5.543 F .492(the line.)180
633.6 R .492(In particular)5.492 F 2.992(,ab)-.4 G(ackslash-ne)-2.992 E
.493(wline pair may not then be used as a line continua-)-.25 F(tion.)
180 645.6 Q F2<ad73>144 657.6 Q F0(Silent mode.)180 657.6 Q
(If input is coming from a terminal, characters are not echoed.)5 E F2
<ad74>144 669.6 Q F1(timeout)2.5 E F0(Cause)180 681.6 Q F2 -.18(re)2.929
G(ad).18 E F0 .428(to time out and return f)2.929 F .428
(ailure if a complete line of input \(or a speci\214ed num-)-.1 F .56
(ber of characters\) is not read within)180 693.6 R F1(timeout)3.061 E
F0(seconds.)3.061 E F1(timeout)5.561 E F0 .561(may be a decimal number)
3.061 F(with a fractional portion follo)180 705.6 Q
(wing the decimal point.)-.25 E(This option is only ef)5 E(fecti)-.25 E
.3 -.15(ve i)-.25 H(f).15 E F2 -.18(re)2.5 G(ad).18 E F0 .506(is readin\
g input from a terminal, pipe, or other special \214le; it has no ef)180
717.6 R .506(fect when reading)-.25 F .59(from re)180 729.6 R .59
(gular \214les.)-.15 F(If)5.59 E F2 -.18(re)3.09 G(ad).18 E F0 .589
(times out,)3.09 F F2 -.18(re)3.089 G(ad).18 E F0(sa)3.089 E -.15(ve)-.2
G 3.089(sa).15 G .889 -.15(ny p)-3.089 H .589
(artial input read into the speci\214ed).15 F(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(69)190.395 E 0 Cg EP
%%Page: 70 70
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E -.25(va)180 84 S
(riable).25 E/F1 10/Times-Italic@0 SF(name)2.77 E F0 5.27(.I)C(f)-5.27 E
F1(timeout)2.77 E F0 .27(is 0,)2.77 F/F2 10/Times-Bold@0 SF -.18(re)2.77
G(ad).18 E F0 .27(returns immediately)2.77 F 2.77(,w)-.65 G .27
(ithout trying to read an)-2.77 F 2.77(yd)-.15 G(ata.)-2.77 E 1.12
(The e)180 96 R 1.12(xit status is 0 if input is a)-.15 F -.25(va)-.2 G
1.12(ilable on the speci\214ed \214le descriptor).25 F 3.62(,n)-.4 G
1.12(on-zero other)-3.62 F(-)-.2 E 2.5(wise. The)180 108 R -.15(ex)2.5 G
(it status is greater than 128 if the timeout is e).15 E(xceeded.)-.15 E
F2<ad75>144 120 Q F1(fd)2.5 E F0(Read input from \214le descriptor)180
120 Q F1(fd)2.5 E F0(.)A .522(If no)144 136.8 R F1(names)3.382 E F0 .522
(are supplied, the line read, without the ending delimiter b)3.292 F
.522(ut otherwise unmodi\214ed, is)-.2 F 1.187(assigned to the v)144
148.8 R(ariable)-.25 E/F3 9/Times-Bold@0 SF(REPL)3.686 E(Y)-.828 E/F4 9
/Times-Roman@0 SF(.)A F0 1.186(The e)5.686 F 1.186
(xit status is zero, unless end-of-\214le is encountered,)-.15 F F2 -.18
(re)3.686 G(ad).18 E F0 .96
(times out \(in which case the status is greater than 128\), a v)144
160.8 R .961(ariable assignment error \(such as as-)-.25 F .707
(signing to a readonly v)144 172.8 R .706(ariable\) occurs, or an in)
-.25 F -.25(va)-.4 G .706(lid \214le descriptor is supplied as the ar)
.25 F .706(gument to)-.18 F F2<ad75>144 184.8 Q F0(.)A F2 -.18(re)108
201.6 S(adonly).18 E F0([)2.5 E F2(\255aAf)A F0 2.5(][)C F2<ad70>-2.5 E
F0 2.5(][)C F1(name)-2.5 E F0([=)A F1(wor)A(d)-.37 E F0 2.5(].)C(..])
-2.5 E .77(The gi)144 213.6 R -.15(ve)-.25 G(n).15 E F1(names)3.27 E F0
.77(are mark)3.27 F .77(ed readonly; the v)-.1 F .77(alues of these)-.25
F F1(names)3.63 E F0 .77(may not be changed by subse-)3.54 F 1.097
(quent assignment.)144 225.6 R 1.097(If the)6.097 F F2<ad66>3.597 E F0
1.097(option is supplied, the functions corresponding to the)3.597 F F1
(names)3.596 E F0 1.096(are so)3.596 F(mark)144 237.6 Q 3.334(ed. The)
-.1 F F2<ad61>3.334 E F0 .834(option restricts the v)3.334 F .834
(ariables to inde)-.25 F -.15(xe)-.15 G 3.334(da).15 G .834(rrays; the)
-3.334 F F2<ad41>3.334 E F0 .834(option restricts the v)3.334 F(ari-)
-.25 E .777(ables to associati)144 249.6 R 1.077 -.15(ve a)-.25 H 3.277
(rrays. If).15 F .777(both options are supplied,)3.277 F F2<ad41>3.277 E
F0(tak)3.277 E .776(es precedence.)-.1 F .776(If no)5.776 F F1(name)
3.636 E F0(ar)3.456 E(gu-)-.18 E .521(ments are gi)144 261.6 R -.15(ve)
-.25 G .521(n, or if the).15 F F2<ad70>3.021 E F0 .521
(option is supplied, a list of all readonly names is printed.)3.021 F
.522(The other)5.521 F .295(options may be used to restrict the output \
to a subset of the set of readonly names.)144 273.6 R(The)5.295 E F2
<ad70>2.795 E F0(option)2.795 E .786
(causes output to be displayed in a format that may be reused as input.)
144 285.6 R .786(If a v)5.786 F .786(ariable name is fol-)-.25 F(lo)144
297.6 Q .718(wed by =)-.25 F F1(wor)A(d)-.37 E F0 3.218(,t)C .718(he v)
-3.218 F .718(alue of the v)-.25 F .718(ariable is set to)-.25 F F1(wor)
3.218 E(d)-.37 E F0 5.718(.T)C .718(he return status is 0 unless an in)
-5.718 F -.25(va)-.4 G(lid).25 E .26(option is encountered, one of the)
144 309.6 R F1(names)3.12 E F0 .26(is not a v)3.03 F .26(alid shell v)
-.25 F .26(ariable name, or)-.25 F F2<ad66>2.76 E F0 .26
(is supplied with a)2.76 F F1(name)144.36 321.6 Q F0
(that is not a function.)2.68 E F2 -.18(re)108 338.4 S(tur).18 E(n)-.15
E F0([)2.5 E F1(n)A F0(])A .021(Causes a function to stop e)144 350.4 R
-.15(xe)-.15 G .021(cuting and return the v).15 F .021
(alue speci\214ed by)-.25 F F1(n)2.88 E F0 .02(to its caller)2.76 F 5.02
(.I)-.55 G(f)-5.02 E F1(n)2.88 E F0 .02(is omitted,)2.76 F .596
(the return status is that of the last command e)144 362.4 R -.15(xe)
-.15 G .597(cuted in the function body).15 F 5.597(.I)-.65 G(f)-5.597 E
F2 -.18(re)3.097 G(tur).18 E(n)-.15 E F0 .597(is e)3.097 F -.15(xe)-.15
G(cuted).15 E .267(by a trap handler)144 374.4 R 2.767(,t)-.4 G .267
(he last command used to determine the status is the last command e)
-2.767 F -.15(xe)-.15 G .267(cuted be-).15 F .02(fore the trap handler)
144 386.4 R 5.02(.I)-.55 G(f)-5.02 E F2 -.18(re)2.52 G(tur).18 E(n)-.15
E F0 .02(is e)2.52 F -.15(xe)-.15 G .02(cuted during a).15 F F2(DEB)2.52
E(UG)-.1 E F0 .02(trap, the last command used to deter)2.52 F(-)-.2 E
.886(mine the status is the last command e)144 398.4 R -.15(xe)-.15 G
.886(cuted by the trap handler before).15 F F2 -.18(re)3.385 G(tur).18 E
(n)-.15 E F0 -.1(wa)3.385 G 3.385(si).1 G -1.9 -.4(nv o)-3.385 H -.1(ke)
.4 G 3.385(d. If).1 F F2 -.18(re)144 410.4 S(tur).18 E(n)-.15 E F0 .627
(is used outside a function, b)3.127 F .628(ut during e)-.2 F -.15(xe)
-.15 G .628(cution of a script by the).15 F F2(.)3.128 E F0(\()5.628 E
F2(sour)A(ce)-.18 E F0 3.128(\)c)C .628(ommand, it)-3.128 F .589
(causes the shell to stop e)144 422.4 R -.15(xe)-.15 G .589
(cuting that script and return either).15 F F1(n)3.448 E F0 .588
(or the e)3.328 F .588(xit status of the last com-)-.15 F .325(mand e)
144 434.4 R -.15(xe)-.15 G .325(cuted within the script as the e).15 F
.326(xit status of the script.)-.15 F(If)5.326 E F1(n)2.826 E F0 .326
(is supplied, the return v)2.826 F .326(alue is)-.25 F .445
(its least signi\214cant 8 bits.)144 446.4 R .444
(The return status is non-zero if)5.445 F F2 -.18(re)2.944 G(tur).18 E
(n)-.15 E F0 .444(is supplied a non-numeric ar)2.944 F(gu-)-.18 E .381
(ment, or is used outside a function and not during e)144 458.4 R -.15
(xe)-.15 G .381(cution of a script by).15 F F2(.)2.881 E F0(or)3.714 E
F2(sour)2.881 E(ce)-.18 E F0 5.381(.A)C .681 -.15(ny c)-5.381 H(om-).15
E .75(mand associated with the)144 470.4 R F2(RETURN)3.249 E F0 .749
(trap is e)3.249 F -.15(xe)-.15 G .749(cuted before e).15 F -.15(xe)-.15
G .749(cution resumes after the function).15 F(or script.)144 482.4 Q F2
(set)108 499.2 Q F0([)2.5 E F2(\255\255abefhkmnptuvxBCEHPT)A F0 2.5(][)C
F2<ad6f>-2.5 E F1(option\255name)2.5 E F0 2.5(][)C F1(ar)-2.5 E(g)-.37 E
F0(...])2.5 E F2(set)108 511.2 Q F0([)2.5 E F2(+abefhkmnptuvxBCEHPT)A F0
2.5(][)C F2(+o)-2.5 E F1(option\255name)2.5 E F0 2.5(][)C F1(ar)-2.5 E
(g)-.37 E F0(...])2.5 E -.4(Wi)144 523.2 S .835
(thout options, the name and v).4 F .835(alue of each shell v)-.25 F
.836(ariable are displayed in a format that can be)-.25 F .784
(reused as input for setting or resetting the currently-set v)144 535.2
R 3.284(ariables. Read-only)-.25 F -.25(va)3.284 G .783
(riables cannot be).25 F 2.946(reset. In)144 547.2 R F1 .447(posix mode)
2.946 F F0 2.947(,o)C .447(nly shell v)-2.947 F .447
(ariables are listed.)-.25 F .447
(The output is sorted according to the current)5.447 F 3.531
(locale. When)144 559.2 R 1.031(options are speci\214ed, the)3.531 F
3.531(ys)-.15 G 1.031(et or unset shell attrib)-3.531 F 3.53(utes. An)
-.2 F 3.53(ya)-.15 G -.18(rg)-3.53 G 1.03(uments remaining).18 F .584
(after option processing are treated as v)144 571.2 R .585
(alues for the positional parameters and are assigned, in or)-.25 F(-)
-.2 E(der)144 583.2 Q 2.5(,t)-.4 G(o)-2.5 E F2($1)2.5 E F0(,)A F2($2)2.5
E F0(,)A F2 2.5(... $)2.5 F F1(n)A F0 5(.O)C(ptions, if speci\214ed, ha)
-5 E .3 -.15(ve t)-.2 H(he follo).15 E(wing meanings:)-.25 E F2<ad61>144
595.2 Q F0 1.378(Each v)184 595.2 R 1.377
(ariable or function that is created or modi\214ed is gi)-.25 F -.15(ve)
-.25 G 3.877(nt).15 G 1.377(he e)-3.877 F 1.377(xport attrib)-.15 F
1.377(ute and)-.2 F(mark)184 607.2 Q(ed for e)-.1 E(xport to the en)-.15
E(vironment of subsequent commands.)-.4 E F2<ad62>144 619.2 Q F0 .131
(Report the status of terminated background jobs immediately)184 619.2 R
2.632(,r)-.65 G .132(ather than before the ne)-2.632 F(xt)-.15 E
(primary prompt.)184 631.2 Q(This is ef)5 E(fecti)-.25 E .3 -.15(ve o)
-.25 H(nly when job control is enabled.).15 E F2<ad65>144 643.2 Q F0
.088(Exit immediately if a)184 643.2 R F1(pipeline)2.588 E F0 .087
(\(which may consist of a single)2.588 F F1 .087(simple command)2.587 F
F0 .087(\), a)B F1(list)2.587 E F0 2.587(,o)C(r)-2.587 E(a)184 655.2 Q
F1 1.52(compound command)4.02 F F0(\(see)4.021 E F3 1.521(SHELL GRAMMAR)
4.021 F F0(abo)3.771 E -.15(ve)-.15 G 1.521(\), e).15 F 1.521
(xits with a non-zero status.)-.15 F .08(The shell does not e)184 667.2
R .079(xit if the command that f)-.15 F .079
(ails is part of the command list immediately)-.1 F(follo)184 679.2 Q
1.654(wing a)-.25 F F2(while)4.154 E F0(or)4.154 E F2(until)4.154 E F0
-.1(ke)4.154 G(yw)-.05 E 1.655(ord, part of the test follo)-.1 F 1.655
(wing the)-.25 F F2(if)4.155 E F0(or)4.155 E F2(elif)4.155 E F0(reserv)
4.155 E(ed)-.15 E -.1(wo)184 691.2 S .582(rds, part of an).1 F 3.082(yc)
-.15 G .582(ommand e)-3.082 F -.15(xe)-.15 G .581(cuted in a).15 F F2
(&&)3.081 E F0(or)3.081 E F2(||)3.081 E F0 .581(list e)3.081 F .581
(xcept the command follo)-.15 F(wing)-.25 E .917(the \214nal)184 703.2 R
F2(&&)3.417 E F0(or)3.417 E F2(||)3.417 E F0 3.417(,a)C 1.217 -.15(ny c)
-3.417 H .918(ommand in a pipeline b).15 F .918
(ut the last, or if the command')-.2 F 3.418(sr)-.55 G(eturn)-3.418 E
-.25(va)184 715.2 S .661(lue is being in).25 F -.15(ve)-.4 G .661
(rted with).15 F F2(!)3.161 E F0 5.661(.I)C 3.161(fac)-5.661 G .66
(ompound command other than a subshell returns a)-3.161 F 1.112
(non-zero status because a command f)184 727.2 R 1.112(ailed while)-.1 F
F2<ad65>3.612 E F0 -.1(wa)3.612 G 3.612(sb).1 G 1.113
(eing ignored, the shell does)-3.612 F(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(70)190.395 E 0 Cg EP
%%Page: 71 71
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .178(not e)184 84
R 2.678(xit. A)-.15 F .178(trap on)2.678 F/F1 10/Times-Bold@0 SF(ERR)
2.678 E F0 2.678(,i)C 2.678(fs)-2.678 G .178(et, is e)-2.678 F -.15(xe)
-.15 G .178(cuted before the shell e).15 F 2.677(xits. This)-.15 F .177
(option applies to)2.677 F .617(the shell en)184 96 R .617
(vironment and each subshell en)-.4 F .617(vironment separately \(see)
-.4 F/F2 9/Times-Bold@0 SF .618(COMMAND EXE-)3.118 F .643(CUTION ENVIR)
184 108 R(ONMENT)-.27 E F0(abo)2.893 E -.15(ve)-.15 G .643
(\), and may cause subshells to e).15 F .643(xit before e)-.15 F -.15
(xe)-.15 G .642(cuting all).15 F(the commands in the subshell.)184 120 Q
.998(If a compound command or shell function e)184 138 R -.15(xe)-.15 G
.999(cutes in a conte).15 F .999(xt where)-.15 F F1<ad65>3.499 E F0 .999
(is being ig-)3.499 F .089(nored, none of the commands e)184 150 R -.15
(xe)-.15 G .089(cuted within the compound command or function body).15 F
.502(will be af)184 162 R .502(fected by the)-.25 F F1<ad65>3.002 E F0
.502(setting, e)3.002 F -.15(ve)-.25 G 3.002(ni).15 G(f)-3.002 E F1
<ad65>3.002 E F0 .502(is set and a command returns a f)3.002 F .503
(ailure sta-)-.1 F 4.184(tus. If)184 174 R 4.184(ac)4.184 G 1.684
(ompound command or shell function sets)-4.184 F F1<ad65>4.183 E F0
1.683(while e)4.183 F -.15(xe)-.15 G 1.683(cuting in a conte).15 F(xt)
-.15 E(where)184 186 Q F1<ad65>3.153 E F0 .653
(is ignored, that setting will not ha)3.153 F .954 -.15(ve a)-.2 H .954
-.15(ny e).15 H -.25(ff).15 G .654(ect until the compound command).25 F
(or the command containing the function call completes.)184 198 Q F1
<ad66>144 210 Q F0(Disable pathname e)184 210 Q(xpansion.)-.15 E F1
<ad68>144 222 Q F0 .988(Remember the location of commands as the)184 222
R 3.488(ya)-.15 G .988(re look)-3.488 F .988(ed up for e)-.1 F -.15(xe)
-.15 G 3.488(cution. This).15 F .987(is en-)3.487 F(abled by def)184 234
Q(ault.)-.1 E F1<ad6b>144 246 Q F0 .513(All ar)184 246 R .514
(guments in the form of assignment statements are placed in the en)-.18
F .514(vironment for a)-.4 F
(command, not just those that precede the command name.)184 258 Q F1
<ad6d>144 270 Q F0 .149(Monitor mode.)184 270 R .149
(Job control is enabled.)5.149 F .148(This option is on by def)5.149 F
.148(ault for interacti)-.1 F .448 -.15(ve s)-.25 H(hells).15 E .65
(on systems that support it \(see)184 282 R F2 .651(JOB CONTR)3.151 F
(OL)-.27 E F0(abo)2.901 E -.15(ve)-.15 G 3.151(\). All).15 F .651
(processes run in a separate)3.151 F .679(process group.)184 294 R .678
(When a background job completes, the shell prints a line containing it\
s)5.679 F -.15(ex)184 306 S(it status.).15 E F1<ad6e>144 318 Q F0 .652
(Read commands b)184 318 R .652(ut do not e)-.2 F -.15(xe)-.15 G .652
(cute them.).15 F .653(This may be used to check a shell script for)
5.652 F(syntax errors.)184 330 Q(This is ignored by interacti)5 E .3
-.15(ve s)-.25 H(hells.).15 E F1<ad6f>144 342 Q/F3 10/Times-Italic@0 SF
(option\255name)2.5 E F0(The)184 354 Q F3(option\255name)2.5 E F0
(can be one of the follo)2.5 E(wing:)-.25 E F1(allexport)184 366 Q F0
(Same as)224 378 Q F1<ad61>2.5 E F0(.)A F1(braceexpand)184 390 Q F0
(Same as)224 402 Q F1<ad42>2.5 E F0(.)A F1(emacs)184 414 Q F0 .089
(Use an emacs-style command line editing interf)224 414 R 2.589
(ace. This)-.1 F .089(is enabled by def)2.589 F(ault)-.1 E .95
(when the shell is interacti)224 426 R -.15(ve)-.25 G 3.45(,u).15 G .95
(nless the shell is started with the)-3.45 F F1(\255\255noediting)3.45 E
F0 2.5(option. This)224 438 R(also af)2.5 E(fects the editing interf)
-.25 E(ace used for)-.1 E F1 -.18(re)2.5 G(ad \255e).18 E F0(.)A F1(err)
184 450 Q(exit)-.18 E F0(Same as)224 450 Q F1<ad65>2.5 E F0(.)A F1
(errtrace)184 462 Q F0(Same as)224 462 Q F1<ad45>2.5 E F0(.)A F1
(functrace)184 474 Q F0(Same as)224 486 Q F1<ad54>2.5 E F0(.)A F1
(hashall)184 498 Q F0(Same as)224 498 Q F1<ad68>2.5 E F0(.)A F1
(histexpand)184 510 Q F0(Same as)224 522 Q F1<ad48>2.5 E F0(.)A F1
(history)184 534 Q F0 .587(Enable command history)224 534 R 3.087(,a)
-.65 G 3.087(sd)-3.087 G .587(escribed abo)-3.087 F .887 -.15(ve u)-.15
H(nder).15 E F2(HIST)3.087 E(OR)-.162 E(Y)-.315 E/F4 9/Times-Roman@0 SF
(.)A F0 .587(This option is)5.087 F(on by def)224 546 Q
(ault in interacti)-.1 E .3 -.15(ve s)-.25 H(hells.).15 E F1(ignor)184
558 Q(eeof)-.18 E F0 1.656(The ef)224 570 R 1.656
(fect is as if the shell command)-.25 F/F5 10/Courier@0 SF(IGNOREEOF=10)
4.157 E F0 1.657(had been e)4.157 F -.15(xe)-.15 G(cuted).15 E(\(see)224
582 Q F1(Shell V)2.5 E(ariables)-.92 E F0(abo)2.5 E -.15(ve)-.15 G(\).)
.15 E F1 -.1(ke)184 594 S(yw).1 E(ord)-.1 E F0(Same as)224 606 Q F1
<ad6b>2.5 E F0(.)A F1(monitor)184 618 Q F0(Same as)224 618 Q F1<ad6d>2.5
E F0(.)A F1(noclob)184 630 Q(ber)-.1 E F0(Same as)224 642 Q F1<ad43>2.5
E F0(.)A F1(noexec)184 654 Q F0(Same as)224 654 Q F1<ad6e>2.5 E F0(.)A
F1(noglob)184 666 Q F0(Same as)224 666 Q F1<ad66>2.5 E F0(.)A F1(nolog)
184 678 Q F0(Currently ignored.)224 678 Q F1(notify)184 690 Q F0
(Same as)224 690 Q F1<ad62>2.5 E F0(.)A F1(nounset)184 702 Q F0(Same as)
224 702 Q F1<ad75>2.5 E F0(.)A F1(onecmd)184 714 Q F0(Same as)224 714 Q
F1<ad74>2.5 E F0(.)A(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(71)
190.395 E 0 Cg EP
%%Page: 72 72
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(ph)184 84 Q(ysical)-.15 E F0(Same as)224 84 Q F1<ad50>2.5 E F0(.)A F1
(pipefail)184 96 Q F0 1.03(If set, the return v)224 96 R 1.029
(alue of a pipeline is the v)-.25 F 1.029
(alue of the last \(rightmost\) com-)-.25 F 1.136(mand to e)224 108 R
1.136
(xit with a non-zero status, or zero if all commands in the pipeline)
-.15 F -.15(ex)224 120 S(it successfully).15 E 5(.T)-.65 G
(his option is disabled by def)-5 E(ault.)-.1 E F1(posix)184 132 Q F0
2.091(Change the beha)224 132 R 2.091(vior of)-.2 F F1(bash)4.591 E F0
2.091(where the def)4.591 F 2.091(ault operation dif)-.1 F 2.091
(fers from the)-.25 F 1.212(POSIX standard to match the standard \()224
144 R/F2 10/Times-Italic@0 SF 1.212(posix mode)B F0 3.712(\). See)B/F3 9
/Times-Bold@0 SF 1.212(SEE ALSO)3.712 F F0(belo)3.463 E(w)-.25 E .955
(for a reference to a document that details ho)224 156 R 3.454(wp)-.25 G
.954(osix mode af)-3.454 F .954(fects bash')-.25 F 3.454(sb)-.55 G(e-)
-3.454 E(ha)224 168 Q(vior)-.2 E(.)-.55 E F1(pri)184 180 Q(vileged)-.1 E
F0(Same as)224 192 Q F1<ad70>2.5 E F0(.)A F1 -.1(ve)184 204 S(rbose).1 E
F0(Same as)224 204 Q F1<ad76>2.5 E F0(.)A F1(vi)184 216 Q F0 .209
(Use a vi-style command line editing interf)224 216 R 2.709(ace. This)
-.1 F .209(also af)2.709 F .21(fects the editing in-)-.25 F(terf)224 228
Q(ace used for)-.1 E F1 -.18(re)2.5 G(ad \255e).18 E F0(.)A F1(xtrace)
184 240 Q F0(Same as)224 240 Q F1<ad78>2.5 E F0(.)A(If)184 258 Q F1
<ad6f>3.053 E F0 .553(is supplied with no)3.053 F F2(option\255name)
3.053 E F0 3.053(,t)C .553(he v)-3.053 F .552
(alues of the current options are printed.)-.25 F(If)5.552 E F1(+o)184
270 Q F0 1.071(is supplied with no)3.571 F F2(option\255name)3.571 E F0
3.571(,as)C 1.071(eries of)-3.571 F F1(set)3.572 E F0 1.072
(commands to recreate the current)3.572 F
(option settings is displayed on the standard output.)184 282 Q F1<ad70>
144 294 Q F0 -.45(Tu)184 294 S 1.072(rn on).45 F F2(privile)4.822 E -.1
(ge)-.4 G(d).1 E F0 3.572(mode. In)4.342 F 1.072(this mode, the)3.572 F
F3($ENV)3.572 E F0(and)3.322 E F3($B)3.572 E(ASH_ENV)-.27 E F0 1.071
(\214les are not pro-)3.322 F 1.5
(cessed, shell functions are not inherited from the en)184 306 R 1.501
(vironment, and the)-.4 F F3(SHELLOPTS)4.001 E/F4 9/Times-Roman@0 SF(,)A
F3 -.27(BA)184 318 S(SHOPTS).27 E F4(,)A F3(CDP)2.775 E -.855(AT)-.666 G
(H).855 E F4(,)A F0(and)2.775 E F3(GLOBIGNORE)3.025 E F0 -.25(va)2.775 G
.524(riables, if the).25 F 3.024(ya)-.15 G .524(ppear in the en)-3.024 F
(vironment,)-.4 E .379(are ignored.)184 330 R .379
(If the shell is started with the ef)5.379 F(fecti)-.25 E .679 -.15
(ve u)-.25 H .38(ser \(group\) id not equal to the real).15 F .462
(user \(group\) id, and the)184 342 R F1<ad70>2.961 E F0 .461
(option is not supplied, these actions are tak)2.961 F .461
(en and the ef)-.1 F(fec-)-.25 E(ti)184 354 Q .694 -.15(ve u)-.25 H .394
(ser id is set to the real user id.).15 F .395(If the)5.395 F F1<ad70>
2.895 E F0 .395(option is supplied at startup, the ef)2.895 F(fecti)-.25
E -.15(ve)-.25 G .387(user id is not reset.)184 366 R -.45(Tu)5.387 G
.387(rning this option of).45 F 2.886(fc)-.25 G .386(auses the ef)-2.886
F(fecti)-.25 E .686 -.15(ve u)-.25 H .386(ser and group ids to be).15 F
(set to the real user and group ids.)184 378 Q F1<ad74>144 390 Q F0
(Exit after reading and e)184 390 Q -.15(xe)-.15 G(cuting one command.)
.15 E F1<ad75>144 402 Q F0 -.35(Tr)184 402 S .043(eat unset v).35 F .044
(ariables and parameters other than the special parameters "@" and "*" \
as an)-.25 F .183(error when performing parameter e)184 414 R 2.683
(xpansion. If)-.15 F -.15(ex)2.683 G .182
(pansion is attempted on an unset v).15 F(ari-)-.25 E .746
(able or parameter)184 426 R 3.246(,t)-.4 G .746
(he shell prints an error message, and, if not interacti)-3.246 F -.15
(ve)-.25 G 3.246(,e).15 G .746(xits with a)-3.396 F(non-zero status.)184
438 Q F1<ad76>144 450 Q F0(Print shell input lines as the)184 450 Q 2.5
(ya)-.15 G(re read.)-2.5 E F1<ad78>144 462 Q F0 .315(After e)184 462 R
.315(xpanding each)-.15 F F2 .315(simple command)2.815 F F0(,)A F1 -.25
(fo)2.815 G(r).25 E F0(command,)2.815 E F1(case)2.815 E F0(command,)
2.815 E F1(select)2.815 E F0(command,)2.815 E 1.235(or arithmetic)184
474 R F1 -.25(fo)3.736 G(r).25 E F0 1.236(command, display the e)3.736 F
1.236(xpanded v)-.15 F 1.236(alue of)-.25 F F3(PS4)3.736 E F4(,)A F0
(follo)3.486 E 1.236(wed by the com-)-.25 F(mand and its e)184 486 Q
(xpanded ar)-.15 E(guments or associated w)-.18 E(ord list.)-.1 E F1
<ad42>144 498 Q F0 1.206(The shell performs brace e)184 498 R 1.206
(xpansion \(see)-.15 F F1 1.205(Brace Expansion)3.705 F F0(abo)3.705 E
-.15(ve)-.15 G 3.705(\). This).15 F 1.205(is on by de-)3.705 F -.1(fa)
184 510 S(ult.).1 E F1<ad43>144 522 Q F0 .213(If set,)184 522 R F1(bash)
2.713 E F0 .213(does not o)2.713 F -.15(ve)-.15 G .214(rwrite an e).15 F
.214(xisting \214le with the)-.15 F F1(>)2.714 E F0(,)A F1(>&)2.714 E F0
2.714(,a)C(nd)-2.714 E F1(<>)2.714 E F0 .214(redirection opera-)2.714 F
3.054(tors. This)184 534 R .553(may be o)3.053 F -.15(ve)-.15 G .553
(rridden when creating output \214les by using the redirection opera-)
.15 F(tor)184 546 Q F1(>|)2.5 E F0(instead of)2.5 E F1(>)2.5 E F0(.)A F1
<ad45>144 558 Q F0 .103(If set, an)184 558 R 2.603(yt)-.15 G .103
(rap on)-2.603 F F1(ERR)2.603 E F0 .104
(is inherited by shell functions, command substitutions, and com-)2.603
F .839(mands e)184 570 R -.15(xe)-.15 G .839(cuted in a subshell en).15
F 3.339(vironment. The)-.4 F F1(ERR)3.338 E F0 .838
(trap is normally not inherited in)3.338 F(such cases.)184 582 Q F1
<ad48>144 594 Q F0(Enable)184 594 Q F1(!)3.031 E F0 .531
(style history substitution.)5.531 F .531(This option is on by def)5.531
F .532(ault when the shell is inter)-.1 F(-)-.2 E(acti)184 606 Q -.15
(ve)-.25 G(.).15 E F1<ad50>144 618 Q F0 .96
(If set, the shell does not resolv)184 618 R 3.459(es)-.15 G .959
(ymbolic links when e)-3.459 F -.15(xe)-.15 G .959
(cuting commands such as).15 F F1(cd)3.459 E F0 1.452
(that change the current w)184 630 R 1.452(orking directory)-.1 F 6.452
(.I)-.65 G 3.953(tu)-6.452 G 1.453(ses the ph)-3.953 F 1.453
(ysical directory structure in-)-.05 F 3.335(stead. By)184 642 R(def)
3.335 E(ault,)-.1 E F1(bash)3.334 E F0(follo)3.334 E .834
(ws the logical chain of directories when performing com-)-.25 F
(mands which change the current directory)184 654 Q(.)-.65 E F1<ad54>144
666 Q F0 .89(If set, an)184 666 R 3.39(yt)-.15 G .89(raps on)-3.39 F F1
(DEB)3.39 E(UG)-.1 E F0(and)3.39 E F1(RETURN)3.39 E F0 .89
(are inherited by shell functions, command)3.39 F 1.932
(substitutions, and commands e)184 678 R -.15(xe)-.15 G 1.932
(cuted in a subshell en).15 F 4.432(vironment. The)-.4 F F1(DEB)4.432 E
(UG)-.1 E F0(and)4.432 E F1(RETURN)184 690 Q F0
(traps are normally not inherited in such cases.)2.5 E F1<adad>144 702 Q
F0 .4(If no ar)184 702 R .401(guments follo)-.18 F 2.901(wt)-.25 G .401
(his option, then the positional parameters are unset.)-2.901 F
(Otherwise,)5.401 E(the positional parameters are set to the)184 714 Q
F2(ar)2.5 E(g)-.37 E F0(s, e)A -.15(ve)-.25 G 2.5(ni).15 G 2.5(fs)-2.5 G
(ome of them be)-2.5 E(gin with a)-.15 E F1<ad>2.5 E F0(.)A
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(72)190.395 E 0 Cg EP
%%Page: 73 73
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF<ad>144 84 Q F0 .797(Signal the end of options, cause all remaining)
184 84 R/F2 10/Times-Italic@0 SF(ar)3.297 E(g)-.37 E F0 3.297(st)C 3.297
(ob)-3.297 G 3.296(ea)-3.297 G .796(ssigned to the positional pa-)-3.296
F 3.021(rameters. The)184 96 R F1<ad78>3.021 E F0(and)3.022 E F1<ad76>
3.022 E F0 .522(options are turned of)3.022 F 3.022(f. If)-.25 F .522
(there are no)3.022 F F2(ar)3.022 E(g)-.37 E F0 .522
(s, the positional pa-)B(rameters remain unchanged.)184 108 Q .425
(The options are of)144 124.8 R 2.925(fb)-.25 G 2.925(yd)-2.925 G(ef)
-2.925 E .425(ault unless otherwise noted.)-.1 F .425
(Using + rather than \255 causes these options)5.425 F .177
(to be turned of)144 136.8 R 2.677(f. The)-.25 F .178
(options can also be speci\214ed as ar)2.678 F .178(guments to an in)
-.18 F -.2(vo)-.4 G .178(cation of the shell.).2 F(The)5.178 E .066
(current set of options may be found in)144 148.8 R F1<24ad>2.566 E F0
5.066(.T)C .066(he return status is al)-5.066 F -.1(wa)-.1 G .066
(ys true unless an in).1 F -.25(va)-.4 G .066(lid option).25 F
(is encountered.)144 160.8 Q F1(shift)108 177.6 Q F0([)2.5 E F2(n)A F0
(])A .428(The positional parameters from)144 189.6 R F2(n)2.928 E F0
.429(+1 ... are renamed to)B F1 .429($1 ....)2.929 F F0 -.15(Pa)5.429 G
.429(rameters represented by the num-).15 F(bers)144 201.6 Q F1($#)2.583
E F0(do)2.583 E .083(wn to)-.25 F F1($#)2.583 E F0<ad>A F2(n)A F0 .083
(+1 are unset.)B F2(n)5.443 E F0 .083(must be a non-ne)2.823 F -.05(ga)
-.15 G(ti).05 E .382 -.15(ve n)-.25 H .082(umber less than or equal to)
.15 F F1($#)2.582 E F0 5.082(.I)C(f)-5.082 E F2(n)2.942 E F0 .06
(is 0, no parameters are changed.)144 213.6 R(If)5.06 E F2(n)2.92 E F0
.06(is not gi)2.8 F -.15(ve)-.25 G .06(n, it is assumed to be 1.).15 F
(If)5.06 E F2(n)2.92 E F0 .06(is greater than)2.8 F F1($#)2.56 E F0 2.56
(,t)C(he)-2.56 E .144(positional parameters are not changed.)144 225.6 R
.144(The return status is greater than zero if)5.144 F F2(n)3.003 E F0
.143(is greater than)2.883 F F1($#)2.643 E F0
(or less than zero; otherwise 0.)144 237.6 Q F1(shopt)108 254.4 Q F0([)
2.5 E F1(\255pqsu)A F0 2.5(][)C F1<ad6f>-2.5 E F0 2.5(][)C F2(optname)
-2.5 E F0(...])2.5 E -.8(To)144 266.4 S .639(ggle the v).8 F .639
(alues of settings controlling optional shell beha)-.25 F(vior)-.2 E
5.639(.T)-.55 G .64(he settings can be either those)-5.639 F .375
(listed belo)144 278.4 R 1.675 -.65(w, o)-.25 H 1.175 -.4(r, i).65 H
2.875(ft).4 G(he)-2.875 E F1<ad6f>2.875 E F0 .375
(option is used, those a)2.875 F -.25(va)-.2 G .375(ilable with the).25
F F1<ad6f>2.875 E F0 .374(option to the)2.875 F F1(set)2.874 E F0 -.2
(bu)2.874 G .374(iltin com-).2 F 2.565(mand. W)144 290.4 R .065
(ith no options, or with the)-.4 F F1<ad70>2.566 E F0 .066
(option, a list of all settable options is displayed, with an in-)2.566
F .074(dication of whether or not each is set; if)144 302.4 R F2
(optnames)2.574 E F0 .074
(are supplied, the output is restricted to those op-)2.574 F 3.105
(tions. The)144 314.4 R F1<ad70>3.105 E F0 .605(option causes output to\
 be displayed in a form that may be reused as input.)3.105 F(Other)5.605
E(options ha)144 326.4 Q .3 -.15(ve t)-.2 H(he follo).15 E
(wing meanings:)-.25 E F1<ad73>144 338.4 Q F0(Enable \(set\) each)180
338.4 Q F2(optname)2.5 E F0(.)A F1<ad75>144 350.4 Q F0
(Disable \(unset\) each)180 350.4 Q F2(optname)2.5 E F0(.)A F1<ad71>144
362.4 Q F0 .003(Suppresses normal output \(quiet mode\); the return sta\
tus indicates whether the)180 362.4 R F2(optname)2.503 E F0(is)2.503 E
.255(set or unset.)180 374.4 R .255(If multiple)5.255 F F2(optname)2.755
E F0(ar)2.755 E .256(guments are gi)-.18 F -.15(ve)-.25 G 2.756(nw).15 G
(ith)-2.756 E F1<ad71>2.756 E F0 2.756(,t)C .256
(he return status is zero if)-2.756 F(all)180 386.4 Q F2(optnames)2.5 E
F0(are enabled; non-zero otherwise.)2.5 E F1<ad6f>144 398.4 Q F0
(Restricts the v)180 398.4 Q(alues of)-.25 E F2(optname)2.5 E F0
(to be those de\214ned for the)2.5 E F1<ad6f>2.5 E F0(option to the)2.5
E F1(set)2.5 E F0 -.2(bu)2.5 G(iltin.).2 E .625(If either)144 415.2 R F1
<ad73>3.125 E F0(or)3.124 E F1<ad75>3.124 E F0 .624(is used with no)
3.124 F F2(optname)3.124 E F0(ar)3.124 E(guments,)-.18 E F1(shopt)3.124
E F0(sho)3.124 E .624(ws only those options which are)-.25 F .983
(set or unset, respecti)144 427.2 R -.15(ve)-.25 G(ly).15 E 5.983(.U)
-.65 G .983(nless otherwise noted, the)-5.983 F F1(shopt)3.484 E F0 .984
(options are disabled \(unset\) by de-)3.484 F -.1(fa)144 439.2 S(ult.)
.1 E 1.544(The return status when listing options is zero if all)144 456
R F2(optnames)4.044 E F0 1.544(are enabled, non-zero otherwise.)4.044 F
.696
(When setting or unsetting options, the return status is zero unless an)
144 468 R F2(optname)3.196 E F0 .696(is not a v)3.196 F .696(alid shell)
-.25 F(option.)144 480 Q(The list of)144 496.8 Q F1(shopt)2.5 E F0
(options is:)2.5 E F1(assoc_expand_once)144 514.8 Q F0 1.945
(If set, the shell suppresses multiple e)184 526.8 R -.25(va)-.25 G
1.944(luation of associati).25 F 2.244 -.15(ve a)-.25 H 1.944
(rray subscripts during).15 F .885(arithmetic e)184 538.8 R .885
(xpression e)-.15 F -.25(va)-.25 G .885(luation, while e).25 F -.15(xe)
-.15 G .885(cuting b).15 F .885(uiltins that can perform v)-.2 F .885
(ariable as-)-.25 F(signments, and while e)184 550.8 Q -.15(xe)-.15 G
(cuting b).15 E(uiltins that perform array dereferencing.)-.2 E F1
(autocd)144 562.8 Q F0 .2
(If set, a command name that is the name of a directory is e)184 562.8 R
-.15(xe)-.15 G .199(cuted as if it were the ar).15 F(gu-)-.18 E
(ment to the)184 574.8 Q F1(cd)2.5 E F0 2.5(command. This)2.5 F
(option is only used by interacti)2.5 E .3 -.15(ve s)-.25 H(hells.).15 E
F1(cdable_v)144 586.8 Q(ars)-.1 E F0 .155(If set, an ar)184 598.8 R .155
(gument to the)-.18 F F1(cd)2.655 E F0 -.2(bu)2.655 G .156
(iltin command that is not a directory is assumed to be the).2 F
(name of a v)184 610.8 Q(ariable whose v)-.25 E
(alue is the directory to change to.)-.25 E F1(cdspell)144 622.8 Q F0
1.055
(If set, minor errors in the spelling of a directory component in a)184
622.8 R F1(cd)3.555 E F0 1.055(command will be)3.555 F 3.987
(corrected. The)184 634.8 R 1.487(errors check)3.987 F 1.487
(ed for are transposed characters, a missing character)-.1 F 3.988(,a)
-.4 G(nd)-3.988 E .77(one character too man)184 646.8 R 4.57 -.65(y. I)
-.15 H 3.27(fac).65 G .77
(orrection is found, the corrected \214lename is printed, and)-3.27 F
(the command proceeds.)184 658.8 Q
(This option is only used by interacti)5 E .3 -.15(ve s)-.25 H(hells.)
.15 E F1(checkhash)144 670.8 Q F0 .736(If set,)184 682.8 R F1(bash)3.236
E F0 .736(checks that a command found in the hash table e)3.236 F .737
(xists before trying to e)-.15 F -.15(xe)-.15 G(-).15 E(cute it.)184
694.8 Q(If a hashed command no longer e)5 E
(xists, a normal path search is performed.)-.15 E F1(checkjobs)144 706.8
Q F0 .449(If set,)184 718.8 R F1(bash)2.949 E F0 .449
(lists the status of an)2.949 F 2.949(ys)-.15 G .448
(topped and running jobs before e)-2.949 F .448(xiting an interacti)-.15
F -.15(ve)-.25 G 3.438(shell. If)184 730.8 R(an)3.438 E 3.438(yj)-.15 G
.938(obs are running, this causes the e)-3.438 F .938
(xit to be deferred until a second e)-.15 F .939(xit is)-.15 F
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(73)190.395 E 0 Cg EP
%%Page: 74 74
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .817
(attempted without an interv)184 84 R .817(ening command \(see)-.15 F/F1
9/Times-Bold@0 SF .816(JOB CONTR)3.316 F(OL)-.27 E F0(abo)3.066 E -.15
(ve)-.15 G 3.316(\). The).15 F .816(shell al-)3.316 F -.1(wa)184 96 S
(ys postpones e).1 E(xiting if an)-.15 E 2.5(yj)-.15 G(obs are stopped.)
-2.5 E/F2 10/Times-Bold@0 SF(checkwinsize)144 108 Q F0 1.09(If set,)184
120 R F2(bash)3.59 E F0 1.09(checks the windo)3.59 F 3.59(ws)-.25 G 1.09
(ize after each e)-3.59 F 1.09(xternal \(non-b)-.15 F 1.09
(uiltin\) command and, if)-.2 F(necessary)184 132 Q 3.351(,u)-.65 G .851
(pdates the v)-3.351 F .85(alues of)-.25 F F1(LINES)3.35 E F0(and)3.1 E
F1(COLUMNS)3.35 E/F3 9/Times-Roman@0 SF(.)A F0 .85
(This option is enabled by de-)5.35 F -.1(fa)184 144 S(ult.).1 E F2
(cmdhist)144 156 Q F0 .172(If set,)184 156 R F2(bash)2.672 E F0 .172
(attempts to sa)2.672 F .472 -.15(ve a)-.2 H .173
(ll lines of a multiple-line command in the same history en-).15 F(try)
184 168 Q 5.597(.T)-.65 G .597(his allo)-5.597 F .597
(ws easy re-editing of multi-line commands.)-.25 F .597
(This option is enabled by de-)5.597 F -.1(fa)184 180 S 1.287(ult, b).1
F 1.288(ut only has an ef)-.2 F 1.288
(fect if command history is enabled, as described abo)-.25 F 1.588 -.15
(ve u)-.15 H(nder).15 E F1(HIST)184 192 Q(OR)-.162 E(Y)-.315 E F3(.)A F2
(compat31)144 204 Q(compat32)144 216 Q(compat40)144 228 Q(compat41)144
240 Q(compat42)144 252 Q(compat43)144 264 Q(compat44)144 276 Q F0 .889
(These control aspects of the shell')184 288 R 3.389(sc)-.55 G .889
(ompatibility mode \(see)-3.389 F F1 .889(SHELL COMP)3.389 F -.855(AT)
-.666 G(IBILITY).855 E(MODE)184 300 Q F0(belo)2.25 E(w\).)-.25 E F2
(complete_fullquote)144 316.8 Q F0 .653(If set,)184 328.8 R F2(bash)
3.153 E F0 .653(quotes all shell metacharacters in \214lenames and dire\
ctory names when per)3.153 F(-)-.2 E 1.525(forming completion.)184 340.8
R 1.524(If not set,)6.525 F F2(bash)4.024 E F0(remo)4.024 E -.15(ve)-.15
G 4.024(sm).15 G 1.524(etacharacters such as the dollar sign)-4.024 F
2.667(from the set of characters that will be quoted in completed \214l\
enames when these)184 352.8 R .029(metacharacters appear in shell v)184
364.8 R .028(ariable references in w)-.25 F .028(ords to be completed.)
-.1 F .028(This means)5.028 F 1.072(that dollar signs in v)184 376.8 R
1.073(ariable names that e)-.25 F 1.073
(xpand to directories will not be quoted; ho)-.15 F(w-)-.25 E -2.15 -.25
(ev e)184 388.8 T 1.923 -.4(r, a).25 H 1.423 -.15(ny d).4 H 1.123
(ollar signs appearing in \214lenames will not be quoted, either).15 F
6.123(.T)-.55 G 1.122(his is acti)-6.123 F -.15(ve)-.25 G .59
(only when bash is using backslashes to quote completed \214lenames.)184
400.8 R .59(This v)5.59 F .59(ariable is set)-.25 F(by def)184 412.8 Q
(ault, which is the def)-.1 E(ault bash beha)-.1 E(vior in v)-.2 E
(ersions through 4.2.)-.15 E F2(dir)144 429.6 Q(expand)-.18 E F0 .487
(If set,)184 441.6 R F2(bash)2.987 E F0 .486
(replaces directory names with the results of w)2.986 F .486(ord e)-.1 F
.486(xpansion when perform-)-.15 F .179(ing \214lename completion.)184
453.6 R .179(This changes the contents of the readline editing b)5.179 F
(uf)-.2 E(fer)-.25 E 5.18(.I)-.55 G 2.68(fn)-5.18 G(ot)-2.68 E(set,)184
465.6 Q F2(bash)2.5 E F0(attempts to preserv)2.5 E 2.5(ew)-.15 G
(hat the user typed.)-2.5 E F2(dirspell)144 482.4 Q F0 .859(If set,)184
482.4 R F2(bash)3.359 E F0 .858
(attempts spelling correction on directory names during w)3.359 F .858
(ord completion if)-.1 F
(the directory name initially supplied does not e)184 494.4 Q(xist.)-.15
E F2(dotglob)144 511.2 Q F0 .165(If set,)184 511.2 R F2(bash)2.665 E F0
.165(includes \214lenames be)2.665 F .165(ginning with a `.)-.15 F 2.665
('i)-.7 G 2.665(nt)-2.665 G .165(he results of pathname e)-2.665 F
(xpansion.)-.15 E(The \214lenames)184 523.2 Q F2 -.63(``)2.5 G -.55(.')
.63 G(')-.08 E F0(and)5 E F2 -.63(``)2.5 G(..).63 E -.63('')-.55 G F0
(must al)5.63 E -.1(wa)-.1 G(ys be matched e).1 E(xplicitly)-.15 E 2.5
(,e)-.65 G -.15(ve)-2.75 G 2.5(ni).15 G(f)-2.5 E F2(dotglob)2.5 E F0
(is set.)2.5 E F2(execfail)144 540 Q F0 .517(If set, a non-interacti)184
540 R .817 -.15(ve s)-.25 H .517(hell will not e).15 F .516
(xit if it cannot e)-.15 F -.15(xe)-.15 G .516
(cute the \214le speci\214ed as an ar).15 F(-)-.2 E(gument to the)184
552 Q F2(exec)2.5 E F0 -.2(bu)2.5 G(iltin command.).2 E(An interacti)5 E
.3 -.15(ve s)-.25 H(hell does not e).15 E(xit if)-.15 E F2(exec)2.5 E F0
-.1(fa)2.5 G(ils.).1 E F2(expand_aliases)144 568.8 Q F0 .716
(If set, aliases are e)184 580.8 R .717(xpanded as described abo)-.15 F
1.017 -.15(ve u)-.15 H(nder).15 E F1(ALIASES)3.217 E F3(.)A F0 .717
(This option is enabled)5.217 F(by def)184 592.8 Q(ault for interacti)
-.1 E .3 -.15(ve s)-.25 H(hells.).15 E F2(extdeb)144 609.6 Q(ug)-.2 E F0
.17(If set at shell in)184 621.6 R -.2(vo)-.4 G .17
(cation, or in a shell startup \214le, arrange to e).2 F -.15(xe)-.15 G
.17(cute the deb).15 F .17(ugger pro\214le)-.2 F 1.081
(before the shell starts, identical to the)184 633.6 R F2<adad646562>
3.582 E(ugger)-.2 E F0 3.582(option. If)3.582 F 1.082(set after in)3.582
F -.2(vo)-.4 G 1.082(cation, be-).2 F(ha)184 645.6 Q
(vior intended for use by deb)-.2 E(uggers is enabled:)-.2 E F2(1.)184
662.4 Q F0(The)220 662.4 Q F2<ad46>4.251 E F0 1.751(option to the)4.251
F F2(declar)4.251 E(e)-.18 E F0 -.2(bu)4.251 G 1.751
(iltin displays the source \214le name and line).2 F
(number corresponding to each function name supplied as an ar)220 674.4
Q(gument.)-.18 E F2(2.)184 691.2 Q F0 1.667(If the command run by the)
220 691.2 R F2(DEB)4.167 E(UG)-.1 E F0 1.667(trap returns a non-zero v)
4.167 F 1.667(alue, the ne)-.25 F(xt)-.15 E
(command is skipped and not e)220 703.2 Q -.15(xe)-.15 G(cuted.).15 E
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(74)190.395 E 0 Cg EP
%%Page: 75 75
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(3.)184 84 Q F0 .841(If the command run by the)220 84 R F1(DEB)3.341 E
(UG)-.1 E F0 .841(trap returns a v)3.341 F .84
(alue of 2, and the shell is)-.25 F -.15(exe)220 96 S .488
(cuting in a subroutine \(a shell function or a shell script e).15 F
-.15(xe)-.15 G .488(cuted by the).15 F F1(.)2.988 E F0(or)2.988 E F1
(sour)220 108 Q(ce)-.18 E F0 -.2(bu)2.5 G
(iltins\), the shell simulates a call to).2 E F1 -.18(re)2.5 G(tur).18 E
(n)-.15 E F0(.)A F1(4.)184 124.8 Q/F2 9/Times-Bold@0 SF -.27(BA)220
124.8 S(SH_ARGC).27 E F0(and)3.154 E F2 -.27(BA)3.404 G(SH_ARGV).27 E F0
.904(are updated as described in their descriptions)3.154 F(abo)220
136.8 Q -.15(ve)-.15 G(.).15 E F1(5.)184 153.6 Q F0 1.637(Function trac\
ing is enabled: command substitution, shell functions, and sub-)220
153.6 R(shells in)220 165.6 Q -.2(vo)-.4 G -.1(ke).2 G 2.5(dw).1 G(ith)
-2.5 E F1(\()2.5 E/F3 10/Times-Italic@0 SF(command)2.5 E F1(\))2.5 E F0
(inherit the)2.5 E F1(DEB)2.5 E(UG)-.1 E F0(and)2.5 E F1(RETURN)2.5 E F0
(traps.)2.5 E F1(6.)184 182.4 Q F0 1.082(Error tracing is enabled: comm\
and substitution, shell functions, and subshells)220 182.4 R(in)220
194.4 Q -.2(vo)-.4 G -.1(ke).2 G 2.5(dw).1 G(ith)-2.5 E F1(\()2.5 E F3
(command)2.5 E F1(\))2.5 E F0(inherit the)2.5 E F1(ERR)2.5 E F0(trap.)
2.5 E F1(extglob)144 211.2 Q F0 .4(If set, the e)184 211.2 R .4
(xtended pattern matching features described abo)-.15 F .7 -.15(ve u)
-.15 H(nder).15 E F1 -.1(Pa)2.9 G .4(thname Expan-).1 F(sion)184 223.2 Q
F0(are enabled.)2.5 E F1(extquote)144 240 Q F0 .86(If set,)184 252 R F1
($)3.36 E F0<08>A F3(string)A F0 3.36<0861>C(nd)-3.36 E F1($)3.36 E F0
(")A F3(string)A F0 3.36("q)C .86(uoting is performed within)-3.36 F F1
(${)3.36 E F3(par)A(ameter)-.15 E F1(})A F0 -.15(ex)3.36 G .86
(pansions en-).15 F(closed in double quotes.)184 264 Q
(This option is enabled by def)5 E(ault.)-.1 E F1(failglob)144 280.8 Q
F0 .242(If set, patterns which f)184 280.8 R .243
(ail to match \214lenames during pathname e)-.1 F .243
(xpansion result in an e)-.15 F(x-)-.15 E(pansion error)184 292.8 Q(.)
-.55 E F1 -.25(fo)144 309.6 S -.18(rc).25 G(e_\214gnor).18 E(e)-.18 E F0
.937(If set, the suf)184 321.6 R<8c78>-.25 E .936(es speci\214ed by the)
-.15 F F2(FIGNORE)3.436 E F0 .936(shell v)3.186 F .936(ariable cause w)
-.25 F .936(ords to be ignored)-.1 F .32(when performing w)184 333.6 R
.32(ord completion e)-.1 F -.15(ve)-.25 G 2.82(ni).15 G 2.82(ft)-2.82 G
.32(he ignored w)-2.82 F .32(ords are the only possible com-)-.1 F 2.948
(pletions. See)184 345.6 R F2 .448(SHELL V)2.948 F(ARIABLES)-1.215 E F0
(abo)2.698 E .748 -.15(ve f)-.15 H .448(or a description of).15 F F2
(FIGNORE)2.947 E/F4 9/Times-Roman@0 SF(.)A F0 .447(This option is)4.947
F(enabled by def)184 357.6 Q(ault.)-.1 E F1(globasciiranges)144 374.4 Q
F0 2.518(If set, range e)184 386.4 R 2.519
(xpressions used in pattern matching brack)-.15 F 2.519(et e)-.1 F 2.519
(xpressions \(see)-.15 F F2 -.09(Pa)5.019 G(tter).09 E(n)-.135 E
(Matching)184 398.4 Q F0(abo)2.965 E -.15(ve)-.15 G 3.215(\)b).15 G(eha)
-3.215 E 1.015 -.15(ve a)-.2 H 3.214(si).15 G 3.214(fi)-3.214 G 3.214
(nt)-3.214 G .714(he traditional C locale when performing comparisons.)
-3.214 F 1.02(That is, the current locale')184 410.4 R 3.52(sc)-.55 G
1.02(ollating sequence is not tak)-3.52 F 1.02(en into account, so)-.1 F
F1(b)3.52 E F0 1.02(will not)3.52 F .957(collate between)184 422.4 R F1
(A)3.457 E F0(and)3.457 E F1(B)3.457 E F0 3.457(,a)C .957(nd upper)
-3.457 F .957(-case and lo)-.2 F(wer)-.25 E .956
(-case ASCII characters will collate)-.2 F(together)184 434.4 Q(.)-.55 E
F1(globstar)144 451.2 Q F0 .518(If set, the pattern)184 451.2 R F1(**)
3.018 E F0 .519(used in a pathname e)3.019 F .519(xpansion conte)-.15 F
.519(xt will match all \214les and zero)-.15 F .432
(or more directories and subdirectories.)184 463.2 R .431
(If the pattern is follo)5.432 F .431(wed by a)-.25 F F1(/)2.931 E F0
2.931(,o)C .431(nly directories)-2.931 F(and subdirectories match.)184
475.2 Q F1(gnu_errfmt)144 492 Q F0(If set, shell error messages are wri\
tten in the standard GNU error message format.)184 504 Q F1(histappend)
144 520.8 Q F0 .676
(If set, the history list is appended to the \214le named by the v)184
532.8 R .676(alue of the)-.25 F F2(HISTFILE)3.177 E F0 -.25(va)2.927 G
(ri-).25 E(able when the shell e)184 544.8 Q(xits, rather than o)-.15 E
-.15(ve)-.15 G(rwriting the \214le.).15 E F1(histr)144 561.6 Q(eedit)
-.18 E F0 .576(If set, and)184 573.6 R F1 -.18(re)3.076 G(adline).18 E
F0 .575(is being used, a user is gi)3.076 F -.15(ve)-.25 G 3.075(nt).15
G .575(he opportunity to re-edit a f)-3.075 F .575(ailed his-)-.1 F
(tory substitution.)184 585.6 Q F1(histv)144 602.4 Q(erify)-.1 E F0 .402
(If set, and)184 614.4 R F1 -.18(re)2.903 G(adline).18 E F0 .403
(is being used, the results of history substitution are not immediately)
2.903 F .662(passed to the shell parser)184 626.4 R 5.662(.I)-.55 G .661
(nstead, the resulting line is loaded into the)-5.662 F F1 -.18(re)3.161
G(adline).18 E F0(editing)3.161 E -.2(bu)184 638.4 S -.25(ff).2 G(er).25
E 2.5(,a)-.4 G(llo)-2.5 E(wing further modi\214cation.)-.25 E F1
(hostcomplete)144 655.2 Q F0 1.181(If set, and)184 667.2 R F1 -.18(re)
3.681 G(adline).18 E F0 1.181(is being used,)3.681 F F1(bash)3.682 E F0
1.182(will attempt to perform hostname completion)3.682 F 1.381
(when a w)184 679.2 R 1.381(ord containing a)-.1 F F1(@)3.881 E F0 1.381
(is being completed \(see)3.881 F F1(Completing)3.88 E F0(under)3.88 E
F2(READLINE)3.88 E F0(abo)184 691.2 Q -.15(ve)-.15 G 2.5(\). This).15 F
(is enabled by def)2.5 E(ault.)-.1 E(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(75)190.395 E 0 Cg EP
%%Page: 76 76
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(huponexit)144 84 Q F0(If set,)184 96 Q F1(bash)2.5 E F0(will send)2.5
E/F2 9/Times-Bold@0 SF(SIGHUP)2.5 E F0(to all jobs when an interacti)
2.25 E .3 -.15(ve l)-.25 H(ogin shell e).15 E(xits.)-.15 E F1
(inherit_err)144 112.8 Q(exit)-.18 E F0 .219
(If set, command substitution inherits the v)184 124.8 R .219
(alue of the)-.25 F F1(err)2.719 E(exit)-.18 E F0 .22
(option, instead of unsetting)2.719 F(it in the subshell en)184 136.8 Q
2.5(vironment. This)-.4 F(option is enabled when)2.5 E/F3 10
/Times-Italic@0 SF(posix mode)2.5 E F0(is enabled.)2.5 E F1(interacti)
144 153.6 Q -.1(ve)-.1 G(_comments).1 E F0 .33(If set, allo)184 165.6 R
2.83(waw)-.25 G .33(ord be)-2.93 F .33(ginning with)-.15 F F1(#)2.83 E
F0 .33(to cause that w)2.83 F .33(ord and all remaining characters on)
-.1 F .967(that line to be ignored in an interacti)184 177.6 R 1.267
-.15(ve s)-.25 H .967(hell \(see).15 F F2(COMMENTS)3.467 E F0(abo)3.217
E -.15(ve)-.15 G 3.467(\). This).15 F .968(option is)3.468 F
(enabled by def)184 189.6 Q(ault.)-.1 E F1(lastpipe)144 206.4 Q F0 .066
(If set, and job control is not acti)184 206.4 R -.15(ve)-.25 G 2.566
(,t).15 G .066(he shell runs the last command of a pipeline not e)-2.566
F -.15(xe)-.15 G(-).15 E
(cuted in the background in the current shell en)184 218.4 Q(vironment.)
-.4 E F1(lithist)144 235.2 Q F0 .654(If set, and the)184 235.2 R F1
(cmdhist)3.154 E F0 .654(option is enabled, multi-line commands are sa)
3.154 F -.15(ve)-.2 G 3.155(dt).15 G 3.155(ot)-3.155 G .655(he history)
-3.155 F(with embedded ne)184 247.2 Q
(wlines rather than using semicolon separators where possible.)-.25 E F1
(localv)144 264 Q(ar_inherit)-.1 E F0 .422(If set, local v)184 276 R
.422(ariables inherit the v)-.25 F .422(alue and attrib)-.25 F .422
(utes of a v)-.2 F .422(ariable of the same name that)-.25 F -.15(ex)184
288 S .173(ists at a pre).15 F .173(vious scope before an)-.25 F 2.673
(yn)-.15 G .673 -.25(ew va)-2.673 H .173(lue is assigned.).25 F .174
(The nameref attrib)5.174 F .174(ute is not)-.2 F(inherited.)184 300 Q
F1(localv)144 316.8 Q(ar_unset)-.1 E F0 .329(If set, calling)184 328.8 R
F1(unset)2.829 E F0 .329(on local v)2.829 F .329(ariables in pre)-.25 F
.328(vious function scopes marks them so subse-)-.25 F .543(quent looku\
ps \214nd them unset until that function returns. This is identical to \
the beha)184 340.8 R(v-)-.2 E(ior of unsetting local v)184 352.8 Q
(ariables at the current function scope.)-.25 E F1(login_shell)144 369.6
Q F0 .486
(The shell sets this option if it is started as a login shell \(see)184
381.6 R F2(INV)2.986 E(OCA)-.405 E(TION)-.855 E F0(abo)2.736 E -.15(ve)
-.15 G 2.986(\). The).15 F -.25(va)184 393.6 S(lue may not be changed.)
.25 E F1(mailwar)144 410.4 Q(n)-.15 E F0 .814(If set, and a \214le that)
184 422.4 R F1(bash)3.314 E F0 .815
(is checking for mail has been accessed since the last time it)3.314 F
-.1(wa)184 434.4 S 2.5(sc).1 G(heck)-2.5 E(ed, the message `)-.1 E
(`The mail in)-.74 E F3(mail\214le)2.5 E F0(has been read')2.5 E 2.5('i)
-.74 G 2.5(sd)-2.5 G(isplayed.)-2.5 E F1(no_empty_cmd_completion)144
451.2 Q F0 .325(If set, and)184 463.2 R F1 -.18(re)2.825 G(adline).18 E
F0 .325(is being used,)2.825 F F1(bash)2.824 E F0 .324
(will not attempt to search the)2.824 F F2 -.666(PA)2.824 G(TH)-.189 E
F0 .324(for possible)2.574 F
(completions when completion is attempted on an empty line.)184 475.2 Q
F1(nocaseglob)144 492 Q F0 .436(If set,)184 504 R F1(bash)2.936 E F0
.436(matches \214lenames in a case\255insensiti)2.936 F .737 -.15(ve f)
-.25 H .437(ashion when performing pathname).05 F -.15(ex)184 516 S
(pansion \(see).15 E F1 -.1(Pa)2.5 G(thname Expansion).1 E F0(abo)2.5 E
-.15(ve)-.15 G(\).).15 E F1(nocasematch)144 532.8 Q F0 1.194(If set,)184
544.8 R F1(bash)3.694 E F0 1.194
(matches patterns in a case\255insensiti)3.694 F 1.493 -.15(ve f)-.25 H
1.193(ashion when performing matching).05 F .551(while e)184 556.8 R
-.15(xe)-.15 G(cuting).15 E F1(case)3.051 E F0(or)3.051 E F1([[)3.051 E
F0 .551(conditional commands, when performing pattern substitution)3.051
F -.1(wo)184 568.8 S .623(rd e).1 F .623(xpansions, or when \214ltering\
 possible completions as part of programmable com-)-.15 F(pletion.)184
580.8 Q F1(nullglob)144 597.6 Q F0 .854(If set,)184 609.6 R F1(bash)
3.354 E F0(allo)3.354 E .855(ws patterns which match no \214les \(see)
-.25 F F1 -.1(Pa)3.355 G .855(thname Expansion).1 F F0(abo)3.355 E -.15
(ve)-.15 G 3.355(\)t).15 G(o)-3.355 E -.15(ex)184 621.6 S
(pand to a null string, rather than themselv).15 E(es.)-.15 E F1(pr)144
638.4 Q(ogcomp)-.18 E F0 .677(If set, the programmable completion f)184
650.4 R .677(acilities \(see)-.1 F F1(Pr)3.176 E .676
(ogrammable Completion)-.18 F F0(abo)3.176 E -.15(ve)-.15 G(\)).15 E
(are enabled.)184 662.4 Q(This option is enabled by def)5 E(ault.)-.1 E
F1(pr)144 679.2 Q(ogcomp_alias)-.18 E F0 2.124
(If set, and programmable completion is enabled,)184 691.2 R F1(bash)
4.624 E F0 2.124(treats a command name that)4.624 F(doesn')184 703.2 Q
3.289(th)-.18 G -2.25 -.2(av e)-3.289 H(an)3.489 E 3.289(yc)-.15 G .789
(ompletions as a possible alias and attempts alias e)-3.289 F .788
(xpansion. If it has)-.15 F 1.473(an alias,)184 715.2 R F1(bash)3.973 E
F0 1.473(attempts programmable completion using the command w)3.973 F
1.473(ord resulting)-.1 F(from the e)184 727.2 Q(xpanded alias.)-.15 E
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(76)190.395 E 0 Cg EP
%%Page: 77 77
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(pr)144 84 Q(omptv)-.18 E(ars)-.1 E F0 1.448
(If set, prompt strings under)184 96 R 1.448(go parameter e)-.18 F 1.447
(xpansion, command substitution, arithmetic)-.15 F -.15(ex)184 108 S .17
(pansion, and quote remo).15 F -.25(va)-.15 G 2.67(la).25 G .17
(fter being e)-2.67 F .17(xpanded as described in)-.15 F/F2 9
/Times-Bold@0 SF(PR)2.671 E(OMPTING)-.27 E F0(abo)2.421 E -.15(ve)-.15 G
(.).15 E(This option is enabled by def)184 120 Q(ault.)-.1 E F1 -.18(re)
144 136.8 S(stricted_shell).18 E F0 1.069
(The shell sets this option if it is started in restricted mode \(see)
184 148.8 R F2 1.069(RESTRICTED SHELL)3.569 F F0(belo)184 160.8 Q 2.86
(w\). The)-.25 F -.25(va)2.86 G .36(lue may not be changed.).25 F .36
(This is not reset when the startup \214les are e)5.36 F -.15(xe)-.15 G
(-).15 E(cuted, allo)184 172.8 Q(wing the startup \214les to disco)-.25
E -.15(ve)-.15 G 2.5(rw).15 G(hether or not a shell is restricted.)-2.5
E F1(shift_v)144 189.6 Q(erbose)-.1 E F0 .502(If set, the)184 201.6 R F1
(shift)3.002 E F0 -.2(bu)3.002 G .501
(iltin prints an error message when the shift count e).2 F .501
(xceeds the number)-.15 F(of positional parameters.)184 213.6 Q F1(sour)
144 230.4 Q(cepath)-.18 E F0 .77(If set, the)184 242.4 R F1(sour)3.27 E
(ce)-.18 E F0(\()3.27 E F1(.)A F0 3.27(\)b)C .77(uiltin uses the v)-3.47
F .771(alue of)-.25 F F2 -.666(PA)3.271 G(TH)-.189 E F0 .771
(to \214nd the directory containing the)3.021 F
(\214le supplied as an ar)184 254.4 Q 2.5(gument. This)-.18 F
(option is enabled by def)2.5 E(ault.)-.1 E F1(xpg_echo)144 271.2 Q F0
(If set, the)184 283.2 Q F1(echo)2.5 E F0 -.2(bu)2.5 G(iltin e).2 E
(xpands backslash-escape sequences by def)-.15 E(ault.)-.1 E F1(suspend)
108 300 Q F0([)2.5 E F1<ad66>A F0(])A 1.002(Suspend the e)144 312 R -.15
(xe)-.15 G 1.002(cution of this shell until it recei).15 F -.15(ve)-.25
G 3.501(sa).15 G F2(SIGCONT)A F0 3.501(signal. A)3.251 F 1.001
(login shell cannot be)3.501 F .022(suspended; the)144 324 R F1<ad66>
2.522 E F0 .022(option can be used to o)2.522 F -.15(ve)-.15 G .022
(rride this and force the suspension.).15 F .023(The return status is)
5.023 F 2.5(0u)144 336 S(nless the shell is a login shell and)-2.5 E F1
<ad66>2.5 E F0(is not supplied, or if job control is not enabled.)2.5 E
F1(test)108 352.8 Q/F3 10/Times-Italic@0 SF -.2(ex)2.5 G(pr).2 E F1([)
108 364.8 Q F3 -.2(ex)2.5 G(pr).2 E F1(])2.5 E F0 .878
(Return a status of 0 \(true\) or 1 \(f)144 364.8 R .877
(alse\) depending on the e)-.1 F -.25(va)-.25 G .877
(luation of the conditional e).25 F(xpression)-.15 E F3 -.2(ex)144 376.8
S(pr).2 E F0 5.53(.E).73 G .53
(ach operator and operand must be a separate ar)-5.53 F 3.03
(gument. Expressions)-.18 F .53(are composed of the)3.03 F 1.361
(primaries described abo)144 388.8 R 1.661 -.15(ve u)-.15 H(nder).15 E
F2(CONDITION)3.861 E 1.36(AL EXPRESSIONS)-.18 F/F4 9/Times-Roman@0 SF(.)
A F1(test)5.86 E F0 1.36(does not accept an)3.86 F 3.86(yo)-.15 G(p-)
-3.86 E(tions, nor does it accept and ignore an ar)144 400.8 Q
(gument of)-.18 E F1<adad>2.5 E F0(as signifying the end of options.)2.5
E .785(Expressions may be combined using the follo)144 418.8 R .786
(wing operators, listed in decreasing order of prece-)-.25 F 3.412
(dence. The)144 430.8 R -.25(eva)3.412 G .912
(luation depends on the number of ar).25 F .911(guments; see belo)-.18 F
4.711 -.65(w. O)-.25 H .911(perator precedence is).65 F
(used when there are \214v)144 442.8 Q 2.5(eo)-.15 G 2.5(rm)-2.5 G
(ore ar)-2.5 E(guments.)-.18 E F1(!)144 454.8 Q F3 -.2(ex)2.5 G(pr).2 E
F0 -.35(Tr)180 454.8 S(ue if).35 E F3 -.2(ex)2.5 G(pr).2 E F0(is f)3.23
E(alse.)-.1 E F1(\()144 466.8 Q F3 -.2(ex)2.5 G(pr).2 E F1(\))2.5 E F0
.26(Returns the v)180 466.8 R .26(alue of)-.25 F F3 -.2(ex)2.76 G(pr).2
E F0 5.26(.T)C .26(his may be used to o)-5.26 F -.15(ve)-.15 G .26
(rride the normal precedence of opera-).15 F(tors.)180 478.8 Q F3 -.2
(ex)144 490.8 S(pr1).2 E F0<ad>2.5 E F1(a)A F3 -.2(ex)2.5 G(pr2).2 E F0
-.35(Tr)180 502.8 S(ue if both).35 E F3 -.2(ex)2.5 G(pr1).2 E F0(and)2.5
E F3 -.2(ex)2.5 G(pr2).2 E F0(are true.)2.52 E F3 -.2(ex)144 514.8 S
(pr1).2 E F0<ad>2.5 E F1(o)A F3 -.2(ex)2.5 G(pr2).2 E F0 -.35(Tr)180
526.8 S(ue if either).35 E F3 -.2(ex)2.5 G(pr1).2 E F0(or)2.5 E F3 -.2
(ex)2.5 G(pr2).2 E F0(is true.)2.52 E F1(test)144 543.6 Q F0(and)2.5 E
F1([)2.5 E F0 -.25(eva)2.5 G(luate conditional e).25 E
(xpressions using a set of rules based on the number of ar)-.15 E
(guments.)-.18 E 2.5(0a)144 561.6 S -.18(rg)-2.5 G(uments).18 E(The e)
180 573.6 Q(xpression is f)-.15 E(alse.)-.1 E 2.5(1a)144 585.6 S -.18
(rg)-2.5 G(ument).18 E(The e)180 597.6 Q
(xpression is true if and only if the ar)-.15 E(gument is not null.)-.18
E 2.5(2a)144 609.6 S -.18(rg)-2.5 G(uments).18 E .37(If the \214rst ar)
180 621.6 R .37(gument is)-.18 F F1(!)2.87 E F0 2.87(,t)C .37(he e)-2.87
F .37(xpression is true if and only if the second ar)-.15 F .37
(gument is null.)-.18 F .379(If the \214rst ar)180 633.6 R .38
(gument is one of the unary conditional operators listed abo)-.18 F .68
-.15(ve u)-.15 H(nder).15 E F2(CONDI-)2.88 E(TION)180 645.6 Q .553
(AL EXPRESSIONS)-.18 F F4(,)A F0 .552(the e)2.802 F .552
(xpression is true if the unary test is true.)-.15 F .552
(If the \214rst ar)5.552 F(gu-)-.18 E(ment is not a v)180 657.6 Q
(alid unary conditional operator)-.25 E 2.5(,t)-.4 G(he e)-2.5 E
(xpression is f)-.15 E(alse.)-.1 E 2.5(3a)144 669.6 S -.18(rg)-2.5 G
(uments).18 E .236(The follo)180 681.6 R .236
(wing conditions are applied in the order listed.)-.25 F .236
(If the second ar)5.236 F .236(gument is one of)-.18 F .855
(the binary conditional operators listed abo)180 693.6 R 1.155 -.15
(ve u)-.15 H(nder).15 E F2(CONDITION)3.355 E .855(AL EXPRESSIONS)-.18 F
F4(,)A F0(the)3.104 E .578(result of the e)180 705.6 R .578(xpression i\
s the result of the binary test using the \214rst and third ar)-.15 F
(guments)-.18 E 1.333(as operands.)180 717.6 R(The)6.333 E F1<ad61>3.833
E F0(and)3.833 E F1<ad6f>3.832 E F0 1.332
(operators are considered binary operators when there are)3.832 F .558
(three ar)180 729.6 R 3.058(guments. If)-.18 F .558(the \214rst ar)3.058
F .558(gument is)-.18 F F1(!)3.058 E F0 3.058(,t)C .558(he v)-3.058 F
.558(alue is the ne)-.25 F -.05(ga)-.15 G .558(tion of the tw).05 F
(o-ar)-.1 E(gument)-.18 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235
E(77)190.395 E 0 Cg EP
%%Page: 78 78
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E .521
(test using the second and third ar)180 84 R 3.021(guments. If)-.18 F
.521(the \214rst ar)3.021 F .52(gument is e)-.18 F(xactly)-.15 E/F1 10
/Times-Bold@0 SF(\()3.02 E F0 .52(and the third)3.02 F(ar)180 96 Q .485
(gument is e)-.18 F(xactly)-.15 E F1(\))2.985 E F0 2.985(,t)C .485
(he result is the one-ar)-2.985 F .485(gument test of the second ar)-.18
F 2.985(gument. Other)-.18 F(-)-.2 E(wise, the e)180 108 Q
(xpression is f)-.15 E(alse.)-.1 E 2.5(4a)144 120 S -.18(rg)-2.5 G
(uments).18 E .385(If the \214rst ar)180 132 R .385(gument is)-.18 F F1
(!)2.885 E F0 2.885(,t)C .385(he result is the ne)-2.885 F -.05(ga)-.15
G .384(tion of the three-ar).05 F .384(gument e)-.18 F .384
(xpression com-)-.15 F .284(posed of the remaining ar)180 144 R 2.784
(guments. Otherwise,)-.18 F .284(the e)2.784 F .284
(xpression is parsed and e)-.15 F -.25(va)-.25 G .285(luated ac-).25 F
(cording to precedence using the rules listed abo)180 156 Q -.15(ve)-.15
G(.).15 E 2.5(5o)144 168 S 2.5(rm)-2.5 G(ore ar)-2.5 E(guments)-.18 E
1.635(The e)180 180 R 1.635(xpression is parsed and e)-.15 F -.25(va)
-.25 G 1.635(luated according to precedence using the rules listed).25 F
(abo)180 192 Q -.15(ve)-.15 G(.).15 E(When used with)144 210 Q F1(test)
2.5 E F0(or)2.5 E F1([)2.5 E F0 2.5(,t)C(he)-2.5 E F1(<)2.5 E F0(and)2.5
E F1(>)2.5 E F0(operators sort le)2.5 E
(xicographically using ASCII ordering.)-.15 E F1(times)108 226.8 Q F0
1.229(Print the accumulated user and system times for the shell and for\
 processes run from the shell.)144 226.8 R(The return status is 0.)144
238.8 Q F1(trap)108 255.6 Q F0([)2.5 E F1(\255lp)A F0 2.5(][)C([)-2.5 E
/F2 10/Times-Italic@0 SF(ar)A(g)-.37 E F0(])A F2(sigspec)2.5 E F0(...])
2.5 E .683(The command)144 267.6 R F2(ar)3.513 E(g)-.37 E F0 .683
(is to be read and e)3.403 F -.15(xe)-.15 G .682
(cuted when the shell recei).15 F -.15(ve)-.25 G 3.182(ss).15 G
(ignal\(s\))-3.182 E F2(sigspec)3.522 E F0 5.682(.I).31 G(f)-5.682 E F2
(ar)3.512 E(g)-.37 E F0(is)3.402 E .608(absent \(and there is a single)
144 279.6 R F2(sigspec)3.108 E F0 3.108(\)o)C(r)-3.108 E F1<ad>3.108 E
F0 3.108(,e)C .608
(ach speci\214ed signal is reset to its original disposition)-3.108 F
.659(\(the v)144 291.6 R .659(alue it had upon entrance to the shell\).)
-.25 F(If)5.658 E F2(ar)3.488 E(g)-.37 E F0 .658
(is the null string the signal speci\214ed by each)3.378 F F2(sigspec)
144.34 303.6 Q F0 .58(is ignored by the shell and by the commands it in)
3.39 F -.2(vo)-.4 G -.1(ke).2 G 3.081(s. If).1 F F2(ar)3.411 E(g)-.37 E
F0 .581(is not present and)3.301 F F1<ad70>3.081 E F0(has)3.081 E 1.215
(been supplied, then the trap commands associated with each)144 315.6 R
F2(sigspec)4.054 E F0 1.214(are displayed.)4.024 F 1.214(If no ar)6.214
F(gu-)-.18 E .86(ments are supplied or if only)144 327.6 R F1<ad70>3.36
E F0 .86(is gi)3.36 F -.15(ve)-.25 G(n,).15 E F1(trap)3.36 E F0 .86
(prints the list of commands associated with each)3.36 F 2.83
(signal. The)144 339.6 R F1<ad6c>2.83 E F0 .33(option causes the shell \
to print a list of signal names and their corresponding num-)2.83 F 4.31
(bers. Each)144 351.6 R F2(sigspec)4.65 E F0 1.811
(is either a signal name de\214ned in <)4.62 F F2(signal.h)A F0 1.811
(>, or a signal number)B 6.811(.S)-.55 G(ignal)-6.811 E
(names are case insensiti)144 363.6 Q .3 -.15(ve a)-.25 H(nd the).15 E
/F3 9/Times-Bold@0 SF(SIG)2.5 E F0(pre\214x is optional.)2.25 E .667
(If a)144 381.6 R F2(sigspec)3.507 E F0(is)3.477 E F3(EXIT)3.167 E F0
.667(\(0\) the command)2.917 F F2(ar)3.496 E(g)-.37 E F0 .666(is e)3.386
F -.15(xe)-.15 G .666(cuted on e).15 F .666(xit from the shell.)-.15 F
.666(If a)5.666 F F2(sigspec)3.506 E F0(is)3.476 E F3(DE-)3.166 E -.09
(BU)144 393.6 S(G).09 E/F4 9/Times-Roman@0 SF(,)A F0 .483(the command)
2.733 F F2(ar)3.313 E(g)-.37 E F0 .483(is e)3.203 F -.15(xe)-.15 G .484
(cuted before e).15 F -.15(ve)-.25 G(ry).15 E F2 .484(simple command)
2.984 F F0(,)A F2(for)2.984 E F0(command,)2.984 E F2(case)2.984 E F0
(command,)2.984 E F2(select)144 405.6 Q F0 .563(command, e)3.063 F -.15
(ve)-.25 G .563(ry arithmetic).15 F F2(for)3.063 E F0 .563
(command, and before the \214rst command e)3.063 F -.15(xe)-.15 G .562
(cutes in a shell).15 F .622(function \(see)144 417.6 R F3 .622
(SHELL GRAMMAR)3.122 F F0(abo)2.872 E -.15(ve)-.15 G 3.122(\). Refer).15
F .622(to the description of the)3.122 F F1(extdeb)3.122 E(ug)-.2 E F0
.622(option to the)3.122 F F1(shopt)144 429.6 Q F0 -.2(bu)2.996 G .496
(iltin for details of its ef).2 F .496(fect on the)-.25 F F1(DEB)2.996 E
(UG)-.1 E F0 2.996(trap. If)2.996 F(a)2.996 E F2(sigspec)3.336 E F0(is)
3.306 E F3(RETURN)2.996 E F4(,)A F0 .496(the command)2.746 F F2(ar)
144.33 441.6 Q(g)-.37 E F0 .18(is e)2.9 F -.15(xe)-.15 G .18
(cuted each time a shell function or a script e).15 F -.15(xe)-.15 G .18
(cuted with the).15 F F1(.)2.68 E F0(or)2.68 E F1(sour)2.68 E(ce)-.18 E
F0 -.2(bu)2.68 G .18(iltins \214nishes).2 F -.15(exe)144 453.6 S
(cuting.).15 E .961(If a)144 471.6 R F2(sigspec)3.801 E F0(is)3.771 E F3
(ERR)3.461 E F4(,)A F0 .961(the command)3.211 F F2(ar)3.791 E(g)-.37 E
F0 .961(is e)3.681 F -.15(xe)-.15 G .961(cuted whene).15 F -.15(ve)-.25
G 3.461(ra).15 G .96(pipeline \(which may consist of a)-.001 F .185(sin\
gle simple command\), a list, or a compound command returns a non\255ze\
ro e)144 483.6 R .185(xit status, subject to)-.15 F .452(the follo)144
495.6 R .452(wing conditions.)-.25 F(The)5.452 E F3(ERR)2.952 E F0 .451
(trap is not e)2.701 F -.15(xe)-.15 G .451(cuted if the f).15 F .451
(ailed command is part of the com-)-.1 F .387
(mand list immediately follo)144 507.6 R .387(wing a)-.25 F F1(while)
2.887 E F0(or)2.887 E F1(until)2.888 E F0 -.1(ke)2.888 G(yw)-.05 E .388
(ord, part of the test in an)-.1 F F2(if)2.898 E F0 .388
(statement, part)4.848 F .778(of a command e)144 519.6 R -.15(xe)-.15 G
.778(cuted in a).15 F F1(&&)3.278 E F0(or)3.278 E F1(||)3.278 E F0 .778
(list e)3.278 F .778(xcept the command follo)-.15 F .778
(wing the \214nal)-.25 F F1(&&)3.278 E F0(or)3.278 E F1(||)3.277 E F0
3.277(,a)C -.15(ny)-3.277 G 1.28(command in a pipeline b)144 531.6 R
1.28(ut the last, or if the command')-.2 F 3.78(sr)-.55 G 1.28(eturn v)
-3.78 F 1.28(alue is being in)-.25 F -.15(ve)-.4 G 1.28(rted using).15 F
F1(!)3.78 E F0(.)A(These are the same conditions obe)144 543.6 Q
(yed by the)-.15 E F1(err)2.5 E(exit)-.18 E F0(\()2.5 E F1<ad65>A F0 2.5
(\)o)C(ption.)-2.5 E .133
(Signals ignored upon entry to the shell cannot be trapped or reset.)144
561.6 R -.35(Tr)5.132 G .132(apped signals that are not be-).35 F .117
(ing ignored are reset to their original v)144 573.6 R .117
(alues in a subshell or subshell en)-.25 F .117
(vironment when one is cre-)-.4 F 2.5(ated. The)144 585.6 R
(return status is f)2.5 E(alse if an)-.1 E(y)-.15 E F2(sigspec)2.84 E F0
(is in)2.81 E -.25(va)-.4 G(lid; otherwise).25 E F1(trap)2.5 E F0
(returns true.)2.5 E F1(type)108 602.4 Q F0([)2.5 E F1(\255aftpP)A F0(])
A F2(name)2.5 E F0([)2.5 E F2(name)A F0(...])2.5 E -.4(Wi)144 614.4 S
.174(th no options, indicate ho).4 F 2.674(we)-.25 G(ach)-2.674 E F2
(name)3.034 E F0 -.1(wo)2.854 G .173
(uld be interpreted if used as a command name.).1 F .173(If the)5.173 F
F1<ad74>144 626.4 Q F0 .715(option is used,)3.215 F F1(type)3.215 E F0
.715(prints a string which is one of)3.215 F F2(alias)3.545 E F0(,).27 E
F2 -.1(ke)3.215 G(ywor)-.2 E(d)-.37 E F0(,).77 E F2(function)5.185 E F0
(,).24 E F2 -.2(bu)3.215 G(iltin).2 E F0 3.215(,o).24 G(r)-3.215 E F2
(\214le)5.125 E F0(if)3.395 E F2(name)144.36 638.4 Q F0 .087
(is an alias, shell reserv)2.767 F .087(ed w)-.15 F .087
(ord, function, b)-.1 F .086(uiltin, or disk \214le, respecti)-.2 F -.15
(ve)-.25 G(ly).15 E 5.086(.I)-.65 G 2.586(ft)-5.086 G(he)-2.586 E F2
(name)2.946 E F0 .086(is not)2.766 F .118
(found, then nothing is printed, and an e)144 650.4 R .118
(xit status of f)-.15 F .118(alse is returned.)-.1 F .119(If the)5.119 F
F1<ad70>2.619 E F0 .119(option is used,)2.619 F F1(type)2.619 E F0 .855
(either returns the name of the disk \214le that w)144 662.4 R .855
(ould be e)-.1 F -.15(xe)-.15 G .855(cuted if).15 F F2(name)3.715 E F0
.855(were speci\214ed as a com-)3.535 F .528(mand name, or nothing if)
144 674.4 R/F5 10/Courier@0 SF .528(type -t name)3.028 F F0 -.1(wo)3.028
G .528(uld not return).1 F F2(\214le)4.938 E F0 5.528(.T).18 G(he)-5.528
E F1<ad50>3.028 E F0 .529(option forces a)3.028 F F3 -.666(PA)3.029 G
(TH)-.189 E F0 .007(search for each)144 686.4 R F2(name)2.507 E F0 2.507
(,e)C -.15(ve)-2.757 G 2.507(ni).15 G(f)-2.507 E F5 .007(type -t name)
2.507 F F0 -.1(wo)2.507 G .007(uld not return).1 F F2(\214le)4.417 E F0
5.006(.I).18 G 2.506(fac)-5.006 G .006(ommand is hashed,)-2.506 F F1
<ad70>2.506 E F0(and)144 698.4 Q F1<ad50>3.23 E F0 .73
(print the hashed v)3.23 F .731
(alue, which is not necessarily the \214le that appears \214rst in)-.25
F F3 -.666(PA)3.231 G(TH)-.189 E F4(.)A F0 .731(If the)5.231 F F1<ad61>
144 710.4 Q F0 .824(option is used,)3.324 F F1(type)3.324 E F0 .824
(prints all of the places that contain an e)3.324 F -.15(xe)-.15 G .823
(cutable named).15 F F2(name)3.683 E F0 5.823(.T).18 G .823(his in-)
-5.823 F 1.176(cludes aliases and functions, if and only if the)144
722.4 R F1<ad70>3.676 E F0 1.176(option is not also used.)3.676 F 1.177
(The table of hashed)6.176 F(GNU Bash 5.1)72 768 Q(2020 October 29)
141.235 E(78)190.395 E 0 Cg EP
%%Page: 79 79
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E 1.223
(commands is not consulted when using)144 84 R/F1 10/Times-Bold@0 SF
<ad61>3.723 E F0 6.223(.T)C(he)-6.223 E F1<ad66>3.723 E F0 1.223
(option suppresses shell function lookup, as)3.723 F .325(with the)144
96 R F1(command)2.825 E F0 -.2(bu)2.825 G(iltin.).2 E F1(type)5.325 E F0
.325(returns true if all of the ar)2.825 F .326(guments are found, f)
-.18 F .326(alse if an)-.1 F 2.826(ya)-.15 G .326(re not)-2.826 F
(found.)144 108 Q F1(ulimit)108 124.8 Q F0([)2.5 E F1(\255HS)A F0(])A F1
<ad61>2.5 E(ulimit)108 136.8 Q F0([)2.5 E F1(\255HS)A F0 2.5(][)C F1
(\255bcde\214klmnpqrstuvxPR)-2.5 E(T)-.4 E F0([)2.5 E/F2 10
/Times-Italic@0 SF(limit)A F0(]])A(Pro)144 148.8 Q .244(vides control o)
-.15 F -.15(ve)-.15 G 2.744(rt).15 G .244(he resources a)-2.744 F -.25
(va)-.2 G .244
(ilable to the shell and to processes started by it, on systems).25 F
.943(that allo)144 160.8 R 3.443(ws)-.25 G .943(uch control.)-3.443 F
(The)5.943 E F1<ad48>3.443 E F0(and)3.443 E F1<ad53>3.444 E F0 .944
(options specify that the hard or soft limit is set for the)3.444 F(gi)
144 172.8 Q -.15(ve)-.25 G 2.709(nr).15 G 2.709(esource. A)-2.709 F .208
(hard limit cannot be increased by a non-root user once it is set; a so\
ft limit may)2.709 F .425(be increased up to the v)144 184.8 R .425
(alue of the hard limit.)-.25 F .426(If neither)5.425 F F1<ad48>2.926 E
F0(nor)2.926 E F1<ad53>2.926 E F0 .426
(is speci\214ed, both the soft and)2.926 F .139(hard limits are set.)144
196.8 R .139(The v)5.139 F .139(alue of)-.25 F F2(limit)2.729 E F0 .139
(can be a number in the unit speci\214ed for the resource or one)3.319 F
.741(of the special v)144 208.8 R(alues)-.25 E F1(hard)3.241 E F0(,)A F1
(soft)3.241 E F0 3.241(,o)C(r)-3.241 E F1(unlimited)3.241 E F0 3.241(,w)
C .741(hich stand for the current hard limit, the current)-3.241 F .024
(soft limit, and no limit, respecti)144 220.8 R -.15(ve)-.25 G(ly).15 E
5.023(.I)-.65 G(f)-5.023 E F2(limit)2.613 E F0 .023
(is omitted, the current v)3.203 F .023
(alue of the soft limit of the re-)-.25 F .984
(source is printed, unless the)144 232.8 R F1<ad48>3.484 E F0 .984
(option is gi)3.484 F -.15(ve)-.25 G 3.484(n. When).15 F .985
(more than one resource is speci\214ed, the)3.484 F .7
(limit name and unit, if appropriate, are printed before the v)144 244.8
R 3.2(alue. Other)-.25 F .7(options are interpreted as)3.2 F(follo)144
256.8 Q(ws:)-.25 E F1<ad61>144 268.8 Q F0
(All current limits are reported; no limits are set)180 268.8 Q F1<ad62>
144 280.8 Q F0(The maximum sock)180 280.8 Q(et b)-.1 E(uf)-.2 E
(fer size)-.25 E F1<ad63>144 292.8 Q F0
(The maximum size of core \214les created)180 292.8 Q F1<ad64>144 304.8
Q F0(The maximum size of a process')180 304.8 Q 2.5(sd)-.55 G(ata se)
-2.5 E(gment)-.15 E F1<ad65>144 316.8 Q F0
(The maximum scheduling priority \("nice"\))180 316.8 Q F1<ad66>144
328.8 Q F0
(The maximum size of \214les written by the shell and its children)180
328.8 Q F1<ad69>144 340.8 Q F0(The maximum number of pending signals)180
340.8 Q F1<ad6b>144 352.8 Q F0
(The maximum number of kqueues that may be allocated)180 352.8 Q F1
<ad6c>144 364.8 Q F0(The maximum size that may be lock)180 364.8 Q
(ed into memory)-.1 E F1<ad6d>144 376.8 Q F0
(The maximum resident set size \(man)180 376.8 Q 2.5(ys)-.15 G
(ystems do not honor this limit\))-2.5 E F1<ad6e>144 388.8 Q F0 .791(Th\
e maximum number of open \214le descriptors \(most systems do not allo)
180 388.8 R 3.291(wt)-.25 G .791(his v)-3.291 F .791(alue to)-.25 F
(be set\))180 400.8 Q F1<ad70>144 412.8 Q F0
(The pipe size in 512-byte blocks \(this may not be set\))180 412.8 Q F1
<ad71>144 424.8 Q F0
(The maximum number of bytes in POSIX message queues)180 424.8 Q F1
<ad72>144 436.8 Q F0(The maximum real-time scheduling priority)180 436.8
Q F1<ad73>144 448.8 Q F0(The maximum stack size)180 448.8 Q F1<ad74>144
460.8 Q F0(The maximum amount of cpu time in seconds)180 460.8 Q F1
<ad75>144 472.8 Q F0(The maximum number of processes a)180 472.8 Q -.25
(va)-.2 G(ilable to a single user).25 E F1<ad76>144 484.8 Q F0 .47
(The maximum amount of virtual memory a)180 484.8 R -.25(va)-.2 G .47
(ilable to the shell and, on some systems, to).25 F(its children)180
496.8 Q F1<ad78>144 508.8 Q F0(The maximum number of \214le locks)180
508.8 Q F1<ad50>144 520.8 Q F0(The maximum number of pseudoterminals)180
520.8 Q F1<ad52>144 532.8 Q F0(The maximum time a real-time process can\
 run before blocking, in microseconds)180 532.8 Q F1<ad54>144 544.8 Q F0
(The maximum number of threads)180 544.8 Q(If)144 561.6 Q F2(limit)3.058
E F0 .468(is gi)3.648 F -.15(ve)-.25 G .468(n, and the).15 F F1<ad61>
2.968 E F0 .468(option is not used,)2.968 F F2(limit)2.968 E F0 .468
(is the ne)2.968 F 2.968(wv)-.25 G .468
(alue of the speci\214ed resource.)-3.218 F(If)5.468 E .045
(no option is gi)144 573.6 R -.15(ve)-.25 G .045(n, then).15 F F1<ad66>
2.545 E F0 .045(is assumed.)2.545 F -1.11(Va)5.045 G .045
(lues are in 1024-byte increments, e)1.11 F .044(xcept for)-.15 F F1
<ad74>2.544 E F0 2.544(,w)C .044(hich is)-2.544 F .67(in seconds;)144
585.6 R F1<ad52>3.17 E F0 3.17(,w)C .67(hich is in microseconds;)-3.17 F
F1<ad70>3.17 E F0 3.17(,w)C .67(hich is in units of 512-byte blocks;)
-3.17 F F1<ad50>3.17 E F0(,)A F1<ad54>3.17 E F0(,)A F1<ad62>3.17 E F0(,)
A F1<ad6b>144 597.6 Q F0(,)A F1<ad6e>3.737 E F0 3.737(,a)C(nd)-3.737 E
F1<ad75>3.736 E F0 3.736(,w)C 1.236(hich are unscaled v)-3.736 F 1.236
(alues; and, when in posix mode,)-.25 F F1<ad63>3.736 E F0(and)3.736 E
F1<ad66>3.736 E F0 3.736(,w)C 1.236(hich are in)-3.736 F .238
(512-byte increments.)144 609.6 R .238
(The return status is 0 unless an in)5.238 F -.25(va)-.4 G .238
(lid option or ar).25 F .238(gument is supplied, or an)-.18 F
(error occurs while setting a ne)144 621.6 Q 2.5(wl)-.25 G(imit.)-2.5 E
F1(umask)108 638.4 Q F0([)2.5 E F1<ad70>A F0 2.5(][)C F1<ad53>-2.5 E F0
2.5(][)C F2(mode)-2.5 E F0(])A .18
(The user \214le-creation mask is set to)144 650.4 R F2(mode)3.06 E F0
5.18(.I).18 G(f)-5.18 E F2(mode)3.06 E F0(be)2.86 E .18
(gins with a digit, it is interpreted as an octal)-.15 F .066(number; o\
therwise it is interpreted as a symbolic mode mask similar to that acce\
pted by)144 662.4 R F2 -.15(ch)2.566 G(mod).15 E F0(\(1\).).77 E(If)144
674.4 Q F2(mode)3.263 E F0 .382(is omitted, the current v)3.063 F .382
(alue of the mask is printed.)-.25 F(The)5.382 E F1<ad53>2.882 E F0 .382
(option causes the mask to be)2.882 F .547
(printed in symbolic form; the def)144 686.4 R .547
(ault output is an octal number)-.1 F 5.547(.I)-.55 G 3.047(ft)-5.547 G
(he)-3.047 E F1<ad70>3.047 E F0 .547(option is supplied, and)3.047 F F2
(mode)144.38 698.4 Q F0 .552
(is omitted, the output is in a form that may be reused as input.)3.232
F .551(The return status is 0 if the)5.551 F(mode w)144 710.4 Q
(as successfully changed or if no)-.1 E F2(mode)2.5 E F0(ar)2.5 E
(gument w)-.18 E(as supplied, and f)-.1 E(alse otherwise.)-.1 E
(GNU Bash 5.1)72 768 Q(2020 October 29)141.235 E(79)190.395 E 0 Cg EP
%%Page: 80 80
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(unalias)108 84 Q F0<5bad>2.5 E F1(a)A F0 2.5(][)C/F2 10
/Times-Italic@0 SF(name)-2.5 E F0(...])2.5 E(Remo)144 96 Q 1.057 -.15
(ve e)-.15 H(ach).15 E F2(name)3.257 E F0 .757
(from the list of de\214ned aliases.)3.257 F(If)5.758 E F1<ad61>3.258 E
F0 .758(is supplied, all alias de\214nitions are re-)3.258 F(mo)144 108
Q -.15(ve)-.15 G 2.5(d. The).15 F(return v)2.5 E
(alue is true unless a supplied)-.25 E F2(name)2.86 E F0
(is not a de\214ned alias.)2.68 E F1(unset)108 124.8 Q F0<5bad>2.5 E F1
(fv)A F0 2.5(][)C<ad>-2.5 E F1(n)A F0 2.5(][)C F2(name)-2.5 E F0(...])
2.5 E -.15(Fo)144 136.8 S 3.804(re).15 G(ach)-3.804 E F2(name)4.164 E F0
3.804(,r).18 G(emo)-3.804 E 1.604 -.15(ve t)-.15 H 1.304
(he corresponding v).15 F 1.303(ariable or function.)-.25 F 1.303
(If the)6.303 F F1<ad76>3.803 E F0 1.303(option is gi)3.803 F -.15(ve)
-.25 G 1.303(n, each).15 F F2(name)144.36 148.8 Q F0 .464
(refers to a shell v)3.144 F .464(ariable, and that v)-.25 F .464
(ariable is remo)-.25 F -.15(ve)-.15 G 2.965(d. Read-only).15 F -.25(va)
2.965 G .465(riables may not be un-).25 F 2.769(set. If)144 160.8 R F1
<ad66>2.769 E F0 .269(is speci\214ed, each)2.769 F F2(name)3.129 E F0
.269(refers to a shell function, and the function de\214nition is remo)
2.949 F -.15(ve)-.15 G(d.).15 E .403(If the)144 172.8 R F1<ad6e>2.903 E
F0 .404(option is supplied, and)2.904 F F2(name)2.904 E F0 .404(is a v)
2.904 F .404(ariable with the)-.25 F F2(namer)2.904 E(ef)-.37 E F0
(attrib)2.904 E(ute,)-.2 E F2(name)2.904 E F0 .404(will be unset)2.904 F
.72(rather than the v)144 184.8 R .72(ariable it references.)-.25 F F1
<ad6e>5.72 E F0 .72(has no ef)3.22 F .719(fect if the)-.25 F F1<ad66>
3.219 E F0 .719(option is supplied.)3.219 F .719(If no options)5.719 F
.736(are supplied, each)144 196.8 R F2(name)3.236 E F0 .736
(refers to a v)3.236 F .737(ariable; if there is no v)-.25 F .737
(ariable by that name, a function with)-.25 F 1.762(that name, if an)144
208.8 R 3.062 -.65(y, i)-.15 H 4.262(su).65 G 4.261(nset. Each)-4.262 F
1.761(unset v)4.261 F 1.761(ariable or function is remo)-.25 F -.15(ve)
-.15 G 4.261(df).15 G 1.761(rom the en)-4.261 F(vironment)-.4 E 3.171
(passed to subsequent commands.)144 220.8 R 3.172(If an)8.172 F 5.672
(yo)-.15 G(f)-5.672 E/F3 9/Times-Bold@0 SF -.27(BA)5.672 G(SH_ALIASES)
.27 E/F4 9/Times-Roman@0 SF(,)A F3 -.27(BA)5.422 G(SH_ARGV0).27 E F4(,)A
F3 -.27(BA)5.422 G(SH_CMDS).27 E F4(,)A F3 -.27(BA)144 232.8 S
(SH_COMMAND).27 E F4(,)A F3 -.27(BA)11.482 G(SH_SUBSHELL).27 E F4(,)A F3
-.27(BA)11.482 G(SHPID).27 E F4(,)A F3(COMP_W)11.482 E(ORDBREAKS)-.09 E
F4(,)A F3(DIRST)11.481 E -.495(AC)-.81 G(K).495 E F4(,)A F3(EPOCHREAL)
144 244.8 Q(TIME)-.828 E F4(,)A F3(EPOCHSECONDS)2.67 E F4(,)A F3(FUNCN)
2.67 E(AME)-.18 E F4(,)A F3(GR)2.67 E(OUPS)-.27 E F4(,)A F3(HISTCMD)2.67
E F4(,)A F3(LINENO)2.67 E F4(,)A F3(RANDOM)2.67 E F4(,)A F3(SECONDS)144
256.8 Q F4(,)A F0(or)4.03 E F3(SRANDOM)4.28 E F0 1.779(are unset, the)
4.03 F 4.279(yl)-.15 G 1.779(ose their special properties, e)-4.279 F
-.15(ve)-.25 G 4.279(ni).15 G 4.279(ft)-4.279 G(he)-4.279 E 4.279(ya)
-.15 G 1.779(re subse-)-4.279 F(quently reset.)144 268.8 Q(The e)5 E
(xit status is true unless a)-.15 E F2(name)2.86 E F0(is readonly)2.68 E
(.)-.65 E F1(wait)108 285.6 Q F0([)2.5 E F1(\255fn)A F0 2.5(][)C F1
<ad70>-2.5 E F2(varname)2.5 E F0 2.5(][)C F2(id ...)-2.5 E F0(])A -.8
(Wa)144 297.6 S .659(it for each speci\214ed child process and return i\
ts termination status.).8 F(Each)5.659 E F2(id)3.169 E F0 .659
(may be a process)3.929 F .009
(ID or a job speci\214cation; if a job spec is gi)144 309.6 R -.15(ve)
-.25 G .008(n, all processes in that job').15 F 2.508(sp)-.55 G .008
(ipeline are w)-2.508 F .008(aited for)-.1 F 5.008(.I)-.55 G(f)-5.008 E
F2(id)144.01 321.6 Q F0 .441(is not gi)3.711 F -.15(ve)-.25 G(n,).15 E
F1(wait)2.941 E F0 -.1(wa)2.941 G .441
(its for all running background jobs and the last-e).1 F -.15(xe)-.15 G
.442(cuted process substitu-).15 F .598
(tion, if its process id is the same as)144 333.6 R F1($!)3.098 E F0
3.098(,a)C .598(nd the return status is zero.)-3.098 F .597(If the)5.597
F F1<ad6e>3.097 E F0 .597(option is supplied,)3.097 F F1(wait)144 345.6
Q F0 -.1(wa)3.082 G .583(its for a single job from the list of).1 F F2
(id)3.083 E F0 3.083(so)C 1.383 -.4(r, i)-3.083 H 3.083(fn).4 G(o)-3.083
E F2(id)3.083 E F0 3.083(sa)C .583(re supplied, an)-3.083 F 3.083(yj)
-.15 G .583(ob, to complete and)-3.083 F .404(returns its e)144 357.6 R
.404(xit status.)-.15 F .403(If none of the supplied ar)5.403 F .403
(guments is a child of the shell, or if no ar)-.18 F(guments)-.18 E .572
(are supplied and the shell has no unw)144 369.6 R .573
(aited-for children, the e)-.1 F .573(xit status is 127.)-.15 F .573
(If the)5.573 F F1<ad70>3.073 E F0 .573(option is)3.073 F .39
(supplied, the process or job identi\214er of the job for which the e)
144 381.6 R .39(xit status is returned is assigned to)-.15 F .905(the v)
144 393.6 R(ariable)-.25 E F2(varname)3.405 E F0 .905
(named by the option ar)3.405 F 3.405(gument. The)-.18 F -.25(va)3.405 G
.905(riable will be unset initially).25 F 3.405(,b)-.65 G(efore)-3.405 E
(an)144 405.6 Q 3.89(ya)-.15 G 3.89(ssignment. This)-3.89 F 1.39
(is useful only when the)3.89 F F1<ad6e>3.89 E F0 1.39
(option is supplied.)3.89 F 1.39(Supplying the)6.39 F F1<ad66>3.89 E F0
(option,)3.89 E .574(when job control is enabled, forces)144 417.6 R F1
(wait)3.075 E F0 .575(to w)3.075 F .575(ait for)-.1 F F2(id)3.075 E F0
.575(to terminate before returning its status, in-)3.075 F .635
(stead of returning when it changes status.)144 429.6 R(If)5.635 E F2
(id)3.145 E F0 .635(speci\214es a non-e)3.905 F .635
(xistent process or job, the return)-.15 F(status is 127.)144 441.6 Q
(Otherwise, the return status is the e)5 E
(xit status of the last process or job w)-.15 E(aited for)-.1 E(.)-.55 E
/F5 10.95/Times-Bold@0 SF(SHELL COMP)72 458.4 Q -1.04(AT)-.81 G
(IBILITY MODE)1.04 E F0 .911
(Bash-4.0 introduced the concept of a `shell compatibility le)108 470.4
R -.15(ve)-.25 G .912(l', speci\214ed as a set of options to the shopt)
.15 F -.2(bu)108 482.4 S(iltin).2 E F1(compat31)3.378 E F0(,)A F1
(compat32)3.378 E F0(,)A F1(compat40)3.378 E F0(,)A F1(compat41)3.378 E
F0 3.378(,a)C .878(nd so on\).)-3.378 F .877
(There is only one current compatibility)5.878 F(le)108 494.4 Q -.15(ve)
-.25 G 3.253(l-).15 G 3.253(-e)-3.253 G .753(ach option is mutually e)
-3.253 F(xclusi)-.15 E -.15(ve)-.25 G 5.753(.T).15 G .753
(he compatibility le)-5.753 F -.15(ve)-.25 G 3.254(li).15 G 3.254(si)
-3.254 G .754(ntended to allo)-3.254 F 3.254(wu)-.25 G .754
(sers to select be-)-3.254 F(ha)108 506.4 Q 1.084(vior from pre)-.2 F
1.084(vious v)-.25 F 1.083(ersions that is incompatible with ne)-.15 F
1.083(wer v)-.25 F 1.083(ersions while the)-.15 F 3.583(ym)-.15 G 1.083
(igrate scripts to use)-3.583 F(current features and beha)108 518.4 Q
(vior)-.2 E 2.5(.I)-.55 G(t')-2.5 E 2.5(si)-.55 G
(ntended to be a temporary solution.)-2.5 E 1.456
(This section does not mention beha)108 535.2 R 1.457
(vior that is standard for a particular v)-.2 F 1.457
(ersion \(e.g., setting)-.15 F F1(compat32)3.957 E F0 .887
(means that quoting the rhs of the re)108 547.2 R(ge)-.15 E .886
(xp matching operator quotes special re)-.15 F(ge)-.15 E .886
(xp characters in the w)-.15 F(ord,)-.1 E(which is def)108 559.2 Q
(ault beha)-.1 E(vior in bash-3.2 and abo)-.2 E -.15(ve)-.15 G(\).).15 E
.522(If a user enables, say)108 576 R(,)-.65 E F1(compat32)3.023 E F0
3.023(,i)C 3.023(tm)-3.023 G .523(ay af)-3.023 F .523(fect the beha)-.25
F .523(vior of other compatibility le)-.2 F -.15(ve)-.25 G .523
(ls up to and includ-).15 F .26(ing the current compatibility le)108 588
R -.15(ve)-.25 G 2.76(l. The).15 F .259
(idea is that each compatibility le)2.759 F -.15(ve)-.25 G 2.759(lc).15
G .259(ontrols beha)-2.759 F .259(vior that changed)-.2 F 1.645
(in that v)108 600 R 1.646(ersion of)-.15 F F1(bash)4.146 E F0 4.146(,b)
C 1.646(ut that beha)-4.346 F 1.646(vior may ha)-.2 F 1.946 -.15(ve b)
-.2 H 1.646(een present in earlier v).15 F 4.146(ersions. F)-.15 F 1.646
(or instance, the)-.15 F .761
(change to use locale-based comparisons with the)108 612 R F1([[)3.261 E
F0 .76(command came in bash-4.1, and earlier v)3.261 F .76(ersions used)
-.15 F 1.904(ASCII-based comparisons, so enabling)108 624 R F1(compat32)
4.404 E F0 1.905(will enable ASCII-based comparisons as well.)4.404 F
(That)6.905 E .296(granularity may not be suf)108 636 R .296
(\214cient for all uses, and as a result users should emplo)-.25 F 2.796
(yc)-.1 G .295(ompatibility le)-2.796 F -.15(ve)-.25 G .295(ls care-).15
F(fully)108 648 Q 5(.R)-.65 G(ead the documentation for a particular fe\
ature to \214nd out the current beha)-5 E(vior)-.2 E(.)-.55 E .531
(Bash-4.3 introduced a ne)108 664.8 R 3.031(ws)-.25 G .531(hell v)-3.031
F(ariable:)-.25 E F3 -.27(BA)3.031 G(SH_COMP).27 E -.855(AT)-.666 G F4
(.).855 E F0 .531(The v)5.031 F .531(alue assigned to this v)-.25 F .532
(ariable \(a decimal)-.25 F -.15(ve)108 676.8 S .108(rsion number lik)
.15 F 2.608(e4)-.1 G .108(.2, or an inte)-2.608 F .108
(ger corresponding to the)-.15 F F1(compat)2.607 E F2(NN)A F0 .107
(option, lik)2.607 F 2.607(e4)-.1 G .107(2\) determines the com-)-2.607
F(patibility le)108 688.8 Q -.15(ve)-.25 G(l.).15 E .387
(Starting with bash-4.4, Bash has be)108 705.6 R .388
(gun deprecating older compatibility le)-.15 F -.15(ve)-.25 G 2.888
(ls. Ev).15 F(entually)-.15 E 2.888(,t)-.65 G .388(he options will)
-2.888 F(be remo)108 717.6 Q -.15(ve)-.15 G 2.5(di).15 G 2.5(nf)-2.5 G
-.2(avo)-2.6 G 2.5(ro).2 G(f)-2.5 E F3 -.27(BA)2.5 G(SH_COMP).27 E -.855
(AT)-.666 G F4(.).855 E F0(GNU Bash 5.1)72 768 Q(2020 October 29)141.235
E(80)190.395 E 0 Cg EP
%%Page: 81 81
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E 1.164
(Bash-5.0 is the \214nal v)108 84 R 1.164
(ersion for which there will be an indi)-.15 F 1.163
(vidual shopt option for the pre)-.25 F 1.163(vious v)-.25 F(ersion.)
-.15 E(Users should use)108 96 Q/F1 9/Times-Bold@0 SF -.27(BA)2.5 G
(SH_COMP).27 E -.855(AT)-.666 G F0(on bash-5.0 and later v)3.105 E
(ersions.)-.15 E 1.613(The follo)108 112.8 R 1.613
(wing table describes the beha)-.25 F 1.613
(vior changes controlled by each compatibility le)-.2 F -.15(ve)-.25 G
4.113(ls).15 G 4.114(etting. The)-4.113 F/F2 10/Times-Bold@0 SF(compat)
108 124.8 Q/F3 10/Times-Italic@0 SF(NN)A F0 1.186
(tag is used as shorthand for setting the compatibility le)3.686 F -.15
(ve)-.25 G 3.686(lt).15 G(o)-3.686 E F3(NN)3.686 E F0 1.186
(using one of the follo)3.686 F(wing)-.25 E 3.806(mechanisms. F)108
136.8 R 1.306(or v)-.15 F 1.306
(ersions prior to bash-5.0, the compatibility le)-.15 F -.15(ve)-.25 G
3.807(lm).15 G 1.307(ay be set using the corresponding)-3.807 F F2
(compat)108 148.8 Q F3(NN)A F0 .502(shopt option.)3.002 F -.15(Fo)5.502
G 3.002(rb).15 G .502(ash-4.3 and later v)-3.002 F .502(ersions, the)
-.15 F F1 -.27(BA)3.002 G(SH_COMP).27 E -.855(AT)-.666 G F0 -.25(va)
3.607 G .502(riable is preferred, and it).25 F
(is required for bash-5.1 and later v)108 160.8 Q(ersions.)-.15 E F2
(compat31)108 177.6 Q F0<83>144 189.6 Q(quoting the rhs of the)180 189.6
Q F2([[)2.5 E F0(command')2.5 E 2.5(sr)-.55 G -.15(eg)-2.5 G -.15(ex).15
G 2.5(pm).15 G(atching operator \(=~\) has no special ef)-2.5 E(fect)
-.25 E F2(compat32)108 206.4 Q F0<83>144 218.4 Q .35
(interrupting a command list such as "a ; b ; c" causes the e)180 218.4
R -.15(xe)-.15 G .35(cution of the ne).15 F .35(xt command)-.15 F .018
(in the list \(in bash-4.0 and later v)180 230.4 R .018
(ersions, the shell acts as if it recei)-.15 F -.15(ve)-.25 G 2.517(dt)
.15 G .017(he interrupt, so in-)-2.517 F
(terrupting one command in a list aborts the e)180 242.4 Q -.15(xe)-.15
G(cution of the entire list\)).15 E F2(compat40)108 259.2 Q F0<83>144
271.2 Q(the)180 271.2 Q F2(<)2.673 E F0(and)2.673 E F2(>)2.673 E F0 .173
(operators to the)2.673 F F2([[)2.673 E F0 .173
(command do not consider the current locale when compar)2.673 F(-)-.2 E
.068(ing strings; the)180 283.2 R 2.568(yu)-.15 G .068
(se ASCII ordering.)-2.568 F .068(Bash v)5.068 F .067
(ersions prior to bash-4.1 use ASCII collation)-.15 F(and)180 295.2 Q F3
(str)4.742 E(cmp)-.37 E F0 1.902
(\(3\); bash-4.1 and later use the current locale').19 F 4.403(sc)-.55 G
1.903(ollation sequence and)-4.403 F F3(str)4.743 E(-)-.2 E(coll)180
307.2 Q F0(\(3\).).51 E F2(compat41)108 324 Q F0<83>144 336 Q(in)180 336
Q F3(posix)3.79 E F0(mode,)3.79 E F2(time)3.79 E F0 1.29(may be follo)
3.79 F 1.29(wed by options and still be recognized as a reserv)-.25 F
(ed)-.15 E -.1(wo)180 348 S(rd \(this is POSIX interpretation 267\)).1 E
<83>144 360 Q(in)180 360 Q F3(posix)2.708 E F0 .208
(mode, the parser requires that an e)2.708 F -.15(ve)-.25 G 2.708(nn).15
G .208(umber of single quotes occur in the)-2.708 F F3(wor)2.709 E(d)
-.37 E F0 .282(portion of a double-quoted parameter e)180 372 R .282
(xpansion and treats them specially)-.15 F 2.781(,s)-.65 G 2.781(ot)
-2.781 G .281(hat charac-)-2.781 F(ters within the single quotes are co\
nsidered quoted \(this is POSIX interpretation 221\))180 384 Q F2
(compat42)108 400.8 Q F0<83>144 412.8 Q 1.055(the replacement string in\
 double-quoted pattern substitution does not under)180 412.8 R 1.056
(go quote re-)-.18 F(mo)180 424.8 Q -.25(va)-.15 G(l, as it does in v)
.25 E(ersions after bash-4.2)-.15 E<83>144 436.8 Q .021
(in posix mode, single quotes are considered special when e)180 436.8 R
.021(xpanding the)-.15 F F3(wor)2.52 E(d)-.37 E F0 .02(portion of a)2.52
F .017(double-quoted parameter e)180 448.8 R .017
(xpansion and can be used to quote a closing brace or other spe-)-.15 F
.999(cial character \(this is part of POSIX interpretation 221\); in la\
ter v)180 460.8 R .998(ersions, single quotes)-.15 F
(are not special within double-quoted w)180 472.8 Q(ord e)-.1 E
(xpansions)-.15 E F2(compat43)108 489.6 Q F0<83>144 501.6 Q 1.07
(the shell does not print a w)180 501.6 R 1.071
(arning message if an attempt is made to use a quoted com-)-.1 F .249
(pound assignment as an ar)180 513.6 R .248
(gument to declare \(declare -a foo='\(1 2\)'\). Later v)-.18 F .248
(ersions w)-.15 F(arn)-.1 E(that this usage is deprecated)180 525.6 Q
<83>144 537.6 Q -.1(wo)180 537.6 S .5(rd e).1 F .501
(xpansion errors are considered non-f)-.15 F .501
(atal errors that cause the current command to)-.1 F -.1(fa)180 549.6 S
.605(il, e).1 F -.15(ve)-.25 G 3.105(ni).15 G 3.105(np)-3.105 G .605
(osix mode \(the def)-3.105 F .605(ault beha)-.1 F .605(vior is to mak)
-.2 F 3.105(et)-.1 G .605(hem f)-3.105 F .605
(atal errors that cause the)-.1 F(shell to e)180 561.6 Q(xit\))-.15 E
<83>144 573.6 Q .354(when e)180 573.6 R -.15(xe)-.15 G .354
(cuting a shell function, the loop state \(while/until/etc.\)).15 F .355
(is not reset, so)5.354 F F2(br)2.855 E(eak)-.18 E F0(or)2.855 E F2
(continue)180 585.6 Q F0 .052
(in that function will break or continue loops in the calling conte)
2.553 F .052(xt. Bash-4.4 and)-.15 F(later reset the loop state to pre)
180 597.6 Q -.15(ve)-.25 G(nt this).15 E F2(compat44)108 614.4 Q F0<83>
144 626.4 Q .719(the shell sets up the v)180 626.4 R .719(alues used by)
-.25 F F1 -.27(BA)3.219 G(SH_ARGV).27 E F0(and)2.969 E F1 -.27(BA)3.219
G(SH_ARGC).27 E F0 .719(so the)2.969 F 3.219(yc)-.15 G .719(an e)-3.219
F(xpand)-.15 E(to the shell')180 638.4 Q 2.5(sp)-.55 G
(ositional parameters e)-2.5 E -.15(ve)-.25 G 2.5(ni).15 G 2.5(fe)-2.5 G
(xtended deb)-2.65 E(ugging mode is not enabled)-.2 E<83>144 650.4 Q
2.635(as)180 650.4 S .135(ubshell inherits loops from its parent conte)
-2.635 F .135(xt, so)-.15 F F2(br)2.635 E(eak)-.18 E F0(or)2.635 E F2
(continue)2.634 E F0 .134(will cause the sub-)2.634 F(shell to e)180
662.4 Q 2.5(xit. Bash-5.0)-.15 F(and later reset the loop state to pre)
2.5 E -.15(ve)-.25 G(nt the e).15 E(xit)-.15 E<83>144 674.4 Q -.25(va)
180 674.4 S .618(riable assignments preceding b).25 F .618(uiltins lik)
-.2 F(e)-.1 E F2(export)3.118 E F0(and)3.118 E F2 -.18(re)3.118 G
(adonly).18 E F0 .618(that set attrib)3.118 F .619(utes con-)-.2 F .12
(tinue to af)180 686.4 R .12(fect v)-.25 F .119
(ariables with the same name in the calling en)-.25 F .119(vironment e)
-.4 F -.15(ve)-.25 G 2.619(ni).15 G 2.619(ft)-2.619 G .119(he shell is)
-2.619 F(not in posix mode)180 698.4 Q(GNU Bash 5.1)72 768 Q
(2020 October 29)141.235 E(81)190.395 E 0 Cg EP
%%Page: 82 82
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10/Times-Bold@0
SF(compat50)108 84 Q F0<83>144 96 Q 1.209(Bash-5.1 changed the w)180 96
R(ay)-.1 E/F2 9/Times-Bold@0 SF($RANDOM)3.709 E F0 1.209
(is generated to introduce slightly more random-)3.459 F 1.019
(ness. If the shell compatibility le)180 108 R -.15(ve)-.25 G 3.518(li)
.15 G 3.518(ss)-3.518 G 1.018(et to 50 or lo)-3.518 F(wer)-.25 E 3.518
(,i)-.4 G 3.518(tr)-3.518 G -2.15 -.25(ev e)-3.518 H 1.018
(rts to the method from).25 F .732(bash-5.0 and pre)180 120 R .732
(vious v)-.25 F .733
(ersions, so seeding the random number generator by assigning a)-.15 F
-.25(va)180 132 S(lue to).25 E F2(RANDOM)2.5 E F0
(will produce the same sequence as in bash-5.0)2.25 E<83>144 144 Q .696
(If the command hash table is empty)180 144 R 3.196(,b)-.65 G .696
(ash v)-3.196 F .695(ersions prior to bash-5.1 printed an informa-)-.15
F 1.32(tional message to that ef)180 156 R 1.321(fect, e)-.25 F -.15(ve)
-.25 G 3.821(nw).15 G 1.321
(hen producing output that can be reused as input.)-3.821 F
(Bash-5.1 suppresses that message when the)180 168 Q F1<ad6c>2.5 E F0
(option is supplied.)2.5 E/F3 10.95/Times-Bold@0 SF(RESTRICTED SHELL)72
184.8 Q F0(If)108 196.8 Q F1(bash)3.582 E F0 1.081
(is started with the name)3.581 F F1(rbash)3.581 E F0 3.581(,o)C 3.581
(rt)-3.581 G(he)-3.581 E F1<ad72>3.581 E F0 1.081
(option is supplied at in)3.581 F -.2(vo)-.4 G 1.081
(cation, the shell becomes re-).2 F 2.976(stricted. A)108 208.8 R .476
(restricted shell is used to set up an en)2.976 F .476
(vironment more controlled than the standard shell.)-.4 F .477(It be-)
5.477 F(ha)108 220.8 Q -.15(ve)-.2 G 2.5(si).15 G(dentically to)-2.5 E
F1(bash)2.5 E F0(with the e)2.5 E(xception that the follo)-.15 E
(wing are disallo)-.25 E(wed or not performed:)-.25 E<83>108 237.6 Q
(changing directories with)144 237.6 Q F1(cd)2.5 E F0<83>108 254.4 Q
(setting or unsetting the v)144 254.4 Q(alues of)-.25 E F2(SHELL)2.5 E
/F4 9/Times-Roman@0 SF(,)A F2 -.666(PA)2.25 G(TH)-.189 E F4(,)A F2
(HISTFILE)2.25 E F4(,)A F2(ENV)2.25 E F4(,)A F0(or)2.25 E F2 -.27(BA)2.5
G(SH_ENV).27 E F0<83>108 271.2 Q(specifying command names containing)144
271.2 Q F1(/)2.5 E F0<83>108 288 Q(specifying a \214lename containing a)
144 288 Q F1(/)2.5 E F0(as an ar)2.5 E(gument to the)-.18 E F1(.)2.5 E
F0 -.2(bu)5 G(iltin command).2 E<83>108 304.8 Q
(specifying a \214lename containing a slash as an ar)144 304.8 Q
(gument to the)-.18 E F1(history)2.5 E F0 -.2(bu)2.5 G(iltin command).2
E<83>108 321.6 Q .45
(specifying a \214lename containing a slash as an ar)144 321.6 R .449
(gument to the)-.18 F F1<ad70>2.949 E F0 .449(option to the)2.949 F F1
(hash)2.949 E F0 -.2(bu)2.949 G .449(iltin com-).2 F(mand)144 333.6 Q
<83>108 350.4 Q(importing function de\214nitions from the shell en)144
350.4 Q(vironment at startup)-.4 E<83>108 367.2 Q(parsing the v)144
367.2 Q(alue of)-.25 E F2(SHELLOPTS)2.5 E F0(from the shell en)2.25 E
(vironment at startup)-.4 E<83>108 384 Q(redirecting output using the >\
, >|, <>, >&, &>, and >> redirection operators)144 384 Q<83>108 400.8 Q
(using the)144 400.8 Q F1(exec)2.5 E F0 -.2(bu)2.5 G
(iltin command to replace the shell with another command).2 E<83>108
417.6 Q(adding or deleting b)144 417.6 Q(uiltin commands with the)-.2 E
F1<ad66>2.5 E F0(and)2.5 E F1<ad64>2.5 E F0(options to the)2.5 E F1
(enable)2.5 E F0 -.2(bu)2.5 G(iltin command).2 E<83>108 434.4 Q
(using the)144 434.4 Q F1(enable)2.5 E F0 -.2(bu)2.5 G
(iltin command to enable disabled shell b).2 E(uiltins)-.2 E<83>108
451.2 Q(specifying the)144 451.2 Q F1<ad70>2.5 E F0(option to the)2.5 E
F1(command)2.5 E F0 -.2(bu)2.5 G(iltin command).2 E<83>108 468 Q
(turning of)144 468 Q 2.5(fr)-.25 G(estricted mode with)-2.5 E F1
(set +r)2.5 E F0(or)2.5 E F1(set +o r)2.5 E(estricted)-.18 E F0(.)A
(These restrictions are enforced after an)108 484.8 Q 2.5(ys)-.15 G
(tartup \214les are read.)-2.5 E 1.566
(When a command that is found to be a shell script is e)108 501.6 R -.15
(xe)-.15 G 1.567(cuted \(see).15 F F2 1.567(COMMAND EXECUTION)4.067 F F0
(abo)3.817 E -.15(ve)-.15 G(\),).15 E F1(rbash)108 513.6 Q F0(turns of)
2.5 E 2.5(fa)-.25 G .3 -.15(ny r)-2.5 H(estrictions in the shell spa).15
E(wned to e)-.15 E -.15(xe)-.15 G(cute the script.).15 E F3(SEE ALSO)72
530.4 Q/F5 10/Times-Italic@0 SF(Bash Refer)108 542.4 Q(ence Manual)-.37
E F0 2.5(,B)C(rian F)-2.5 E(ox and Chet Rame)-.15 E(y)-.15 E F5
(The Gnu Readline Libr)108 554.4 Q(ary)-.15 E F0 2.5(,B)C(rian F)-2.5 E
(ox and Chet Rame)-.15 E(y)-.15 E F5(The Gnu History Libr)108 566.4 Q
(ary)-.15 E F0 2.5(,B)C(rian F)-2.5 E(ox and Chet Rame)-.15 E(y)-.15 E
F5 -.8(Po)108 578.4 S(rtable Oper).8 E
(ating System Interface \(POSIX\) P)-.15 E(art 2: Shell and Utilities)
-.8 E F0 2.5(,I)C(EEE --)-2.5 E(http://pubs.opengroup.or)144 590.4 Q
(g/onlinepubs/9699919799/)-.18 E(http://tiswww)108 602.4 Q
(.case.edu/~chet/bash/POSIX -- a description of posix mode)-.65 E F5(sh)
108 614.4 Q F0(\(1\),)A F5(ksh)2.5 E F0(\(1\),)A F5(csh)2.5 E F0(\(1\))A
F5(emacs)108 626.4 Q F0(\(1\),)A F5(vi)2.5 E F0(\(1\))A F5 -.37(re)108
638.4 S(adline).37 E F0(\(3\))A F3(FILES)72 655.2 Q F5(/bin/bash)109.666
667.2 Q F0(The)144 679.2 Q F1(bash)2.5 E F0 -.15(exe)2.5 G(cutable).15 E
F5(/etc/pr)109.666 691.2 Q(o\214le)-.45 E F0
(The systemwide initialization \214le, e)144 703.2 Q -.15(xe)-.15 G
(cuted for login shells).15 E(GNU Bash 5.1)72 768 Q(2020 October 29)
141.235 E(82)190.395 E 0 Cg EP
%%Page: 83 83
%%BeginPageSetup
BP
%%EndPageSetup
/F0 10/Times-Roman@0 SF -.35(BA)72 48 S 137.14(SH\(1\) General).35 F
(Commands Manual)2.5 E -.35(BA)139.64 G(SH\(1\)).35 E/F1 10
/Times-Italic@0 SF(~/.bash_pr)109.666 84 Q(o\214le)-.45 E F0
(The personal initialization \214le, e)144 96 Q -.15(xe)-.15 G
(cuted for login shells).15 E F1(~/.bashr)109.666 108 Q(c)-.37 E F0
(The indi)144 120 Q(vidual per)-.25 E(-interacti)-.2 E -.15(ve)-.25 G
(-shell startup \214le).15 E F1(~/.bash_lo)109.666 132 Q(gout)-.1 E F0
(The indi)144 144 Q(vidual login shell cleanup \214le, e)-.25 E -.15(xe)
-.15 G(cuted when a login shell e).15 E(xits)-.15 E F1(~/.inputr)109.666
156 Q(c)-.37 E F0(Indi)144 168 Q(vidual)-.25 E F1 -.37(re)2.5 G(adline)
.37 E F0(initialization \214le)2.5 E/F2 10.95/Times-Bold@0 SF -.548(AU)
72 184.8 S(THORS).548 E F0(Brian F)108 196.8 Q(ox, Free Softw)-.15 E
(are F)-.1 E(oundation)-.15 E(bfox@gnu.or)108 208.8 Q(g)-.18 E
(Chet Rame)108 225.6 Q 1.3 -.65(y, C)-.15 H(ase W).65 E(estern Reserv)
-.8 E 2.5(eU)-.15 G(ni)-2.5 E -.15(ve)-.25 G(rsity).15 E(chet.rame)108
237.6 Q(y@case.edu)-.15 E F2 -.11(BU)72 254.4 S 2.738(GR).11 G(EPOR)
-2.738 E(TS)-.438 E F0 .568(If you \214nd a b)108 266.4 R .568(ug in)-.2
F/F3 10/Times-Bold@0 SF(bash,)3.068 E F0 .568(you should report it.)
3.068 F .568(But \214rst, you should mak)5.568 F 3.068(es)-.1 G .568
(ure that it really is a b)-3.068 F .567(ug, and)-.2 F 5.625
(that it appears in the latest v)108 278.4 R 5.625(ersion of)-.15 F F3
(bash)8.125 E F0 10.625(.T)C 5.625(he latest v)-10.625 F 5.626
(ersion is al)-.15 F -.1(wa)-.1 G 5.626(ys a).1 F -.25(va)-.2 G 5.626
(ilable from).25 F F1(ftp://ftp.gnu.or)108 290.4 Q(g/pub/gnu/bash/)-.37
E F0(.)A .411(Once you ha)108 307.2 R .711 -.15(ve d)-.2 H .411
(etermined that a b).15 F .411(ug actually e)-.2 F .411(xists, use the)
-.15 F F1(bashb)3.18 E(ug)-.2 E F0 .41(command to submit a b)3.13 F .41
(ug report.)-.2 F(If)5.41 E .594(you ha)108 319.2 R .894 -.15(ve a \214)
-.2 H .595(x, you are encouraged to mail that as well!).15 F .595
(Suggestions and `philosophical' b)5.595 F .595(ug reports may)-.2 F
(be mailed to)108 331.2 Q F1 -.2(bu)2.5 G(g-bash@gnu.or).2 E(g)-.37 E F0
(or posted to the Usenet ne)2.5 E(wsgroup)-.25 E F3(gnu.bash.b)2.5 E(ug)
-.2 E F0(.)A(ALL b)108 348 Q(ug reports should include:)-.2 E(The v)108
364.8 Q(ersion number of)-.15 E F3(bash)2.5 E F0(The hardw)108 376.8 Q
(are and operating system)-.1 E(The compiler used to compile)108 388.8 Q
2.5(Ad)108 400.8 S(escription of the b)-2.5 E(ug beha)-.2 E(viour)-.2 E
2.5(As)108 412.8 S(hort script or `recipe' which e)-2.5 E -.15(xe)-.15 G
(rcises the b).15 E(ug)-.2 E F1(bashb)108.27 429.6 Q(ug)-.2 E F0
(inserts the \214rst three items automatically into the template it pro)
2.72 E(vides for \214ling a b)-.15 E(ug report.)-.2 E(Comments and b)108
446.4 Q(ug reports concerning this manual page should be directed to)-.2
E F1 -.15(ch)2.5 G(et.r).15 E(ame)-.15 E(y@case)-.3 E(.edu)-.15 E F0(.)
.25 E F2 -.11(BU)72 463.2 S(GS).11 E F0(It')108 475.2 Q 2.5(st)-.55 G
(oo big and too slo)-2.5 E -.65(w.)-.25 G 1.869
(There are some subtle dif)108 492 R 1.869(ferences between)-.25 F F3
(bash)4.369 E F0 1.869(and traditional v)4.369 F 1.869(ersions of)-.15 F
F3(sh)4.368 E F0 4.368(,m)C 1.868(ostly because of the)-4.368 F/F4 9
/Times-Bold@0 SF(POSIX)108 504 Q F0(speci\214cation.)2.25 E
(Aliases are confusing in some uses.)108 520.8 Q(Shell b)108 537.6 Q
(uiltin commands and functions are not stoppable/restartable.)-.2 E
1.315(Compound commands and command sequences of the form `a ; b ; c' a\
re not handled gracefully when)108 554.4 R .39
(process suspension is attempted.)108 566.4 R .389
(When a process is stopped, the shell immediately e)5.39 F -.15(xe)-.15
G .389(cutes the ne).15 F .389(xt com-)-.15 F .192
(mand in the sequence.)108 578.4 R .192(It suf)5.192 F .192(\214ces to \
place the sequence of commands between parentheses to force it into a)
-.25 F(subshell, which may be stopped as a unit.)108 590.4 Q(Array v)108
607.2 Q(ariables may not \(yet\) be e)-.25 E(xported.)-.15 E
(There may be only one acti)108 624 Q .3 -.15(ve c)-.25 H
(oprocess at a time.).15 E(GNU Bash 5.1)72 768 Q(2020 October 29)141.235
E(83)190.395 E 0 Cg EP
%%Trailer
end
%%EOF