| Chet Ramey | 8868eda | 2020-12-06 15:51:17 -0500 | [diff] [blame] | 1 | # This program is free software: you can redistribute it and/or modify |
| 2 | # it under the terms of the GNU General Public License as published by |
| 3 | # the Free Software Foundation, either version 3 of the License, or |
| 4 | # (at your option) any later version. |
| 5 | # |
| 6 | # This program is distributed in the hope that it will be useful, |
| 7 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 8 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 9 | # GNU General Public License for more details. |
| 10 | # |
| 11 | # You should have received a copy of the GNU General Public License |
| 12 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 13 | # |
| Jari Aalto | bb70624 | 2000-03-17 21:46:59 +0000 | [diff] [blame] | 14 | # tests of return value inversion |
| 15 | # placeholder for future expansion |
| 16 | |
| 17 | # user subshells (...) did this wrong in bash versions before 2.04 |
| 18 | |
| 19 | ! ( echo hello | grep h >/dev/null 2>&1 ); echo $? |
| 20 | ! echo hello | grep h >/dev/null 2>&1 ; echo $? |
| 21 | |
| 22 | ! true ; echo $? |
| 23 | ! false; echo $? |
| 24 | |
| 25 | ! (false) ; echo $? |
| 26 | ! (true); echo $? |
| 27 | |
| 28 | ! true | false ; echo $? |
| 29 | ! false | true ; echo $? |
| 30 | |
| 31 | ! (true | false) ; echo $? |
| 32 | ! (false | true) ; echo $? |