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#
14# make sure commands before the last one in the pipeline can't change $?
15false
16false | echo $?
17false
18(false) | echo $?
19
20false
21true | echo $?
22false
23(true) | echo $?
24
25true
26false | echo $?
27true
28(false) | echo $?
29
30true
31true | echo $?
32true
33(true) | echo $?
34