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Chet Ramey
60 lines
1.7 KiB
Plaintext
60 lines
1.7 KiB
Plaintext
# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# failing redirections with various compound commands and their effect on
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# set -e and the ERR trap
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: ${TMPDIR:=/tmp}
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TDIR=$TMPDIR/redir-fail-$$
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mkdir $TDIR
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cd $TDIR || exit 1
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touch unwritable-file unreadable-file
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chmod a-w unwritable-file
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chmod a-r unreadable-file
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while [ -z "x" ]; do x=4; done > unwritable-file
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echo $? x = $x
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set -o noclobber
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while [ -z "x" ]; do x=4; done > unwritable-file
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echo $? x = $x
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# test priority of noclobber and permission denied
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while [ -z "x" ]; do x=4; done >| unwritable-file
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echo $? x = $x
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set +o noclobber
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while [ -z "x" ]; do x=4; done < unreadable-file
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# ERR trap is not fatal unless set -e is also enabled
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(trap 'echo got error ERR' ERR
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# have to undo redirections on redirection error
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while [ -z "x" ]; do x=4; done </dev/null > unwritable-file
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echo after ERR trap: $?)
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(set -e
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for f in 1 2; do x=4; done > unwritable-file
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echo after set -e: $?)
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(set -e
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trap 'echo got error ERR' ERR
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for f in 1 2; do x=4; done < unreadable-file
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echo after set -e with ERR trap: $?)
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# the subshell never gets executed
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( echo wow this is bad ) < unreadable-file
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cd $OLDPWD
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rm -rf $TDIR
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