#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
binfalse()
{
	$binfalse || return 1	# normalize return value
}

if [ -x /usr/bin/true ]; then
	bintrue=/usr/bin/true
elif [ -x /bin/true ]; then
	bintrue=/bin/true
else
	bintrue=true
fi
if [ -x /usr/bin/false ]; then
	binfalse=/usr/bin/false
elif [ -x /bin/false ]; then
	binfalse=/bin/false
else
	binfalse=false
fi

shopt -s lastpipe

unset foo bar
echo a b c | read foo
echo after 1: foo = $foo

unset tot
declare -i tot
printf "%d\n" 1 2 3 | while read foo; do tot+=$foo; done
echo after 2: tot = $tot

unset bar
echo g h i | bar=7
echo after: $bar

unset foo last
printf "%s\n" a b c | while read foo; do last=$foo; done
echo last = $last

exit 142 | false
echo $? -- ${PIPESTATUS[@]}

true | false | $bintrue
echo $? -- ${PIPESTATUS[@]}

true | $bintrue | false
echo $? -- ${PIPESTATUS[@]}

set -o pipefail
true | $bintrue | false
echo $? -- ${PIPESTATUS[@]}

true | binfalse | true
echo $? -- ${PIPESTATUS[@]}
set +o pipefail

${THIS_SH} ./lastpipe1.sub
echo lastpipe1.sub returns $?

${THIS_SH} ./lastpipe2.sub
${THIS_SH} ./lastpipe3.sub