69 lines
1.3 KiB
Text
69 lines
1.3 KiB
Text
# 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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minus=-
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# standard input
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fd=0
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exec 3<&$fd
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read line <&3
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echo from stdin: $line
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# close fd 3
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exec 3<&${minus}
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# should give `bad fd', but exact error messages vary
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# read line <&3
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# standard output
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fd=1
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exec 4>&$fd
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echo to stdout >&4
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exec 4>&$minus
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# should give `bad fd', but exact error messages vary
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# echo to stdout >&4
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unset fd
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# these are ambiguous redirects
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exec 3<&$fd
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exec 4>&$fd
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exec 3>&1 4>&2
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exec >&${TMPDIR}/err-and-out
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echo to stdout
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echo to stderr >&2
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exec 1>&3 2>&4
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echo err-and-out:
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cat ${TMPDIR}/err-and-out
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rm ${TMPDIR}/err-and-out
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fd=${TMPDIR}/err-and-out
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exec >&$fd
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echo to stdout
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echo to stderr >&2
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exec 1>&3 2>&4
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echo err-and-out:
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cat ${TMPDIR}/err-and-out
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rm ${TMPDIR}/err-and-out
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