mirror of
https://https.git.savannah.gnu.org/git/bash.git
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Chet Ramey
65 lines
1.5 KiB
Plaintext
65 lines
1.5 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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# posix-mode alias expansion in command substitutions within other constructs
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DATE='Mon Aug 29 20:03:02 EDT 2022'
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shopt -s expand_aliases
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alias number="echo 123"
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echo $(number)
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echo $(( $(number) ))
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(( $(number) )) ; echo $?
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set -o posix
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echo $(number)
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echo $(( $(number) ))
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(( $(number) )) ; echo $?
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set +o posix
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# have to turn it back on after leaving posix mode
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shopt -s expand_aliases
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alias my_alias='echo $DATE'
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echo $(eval my_alias)
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echo $(my_alias)
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set -o posix
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echo $(eval my_alias)
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echo $(my_alias)
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set +o posix ; shopt -s expand_aliases
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alias e=echo
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alias v='e 123'
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set -o posix
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echo $(v)
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echo $(echo before ; v)
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echo $(for f in 0; do
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echo in for
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done; v)
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set +o posix ; shopt -s expand_aliases
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alias let='let --'
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let '1 == 1'
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: $(let '1 == 1')
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set -o posix
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let '1 == 1'
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: $(let '1 == 1')
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set +o posix ; shopt -s expand_aliases
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