51 lines
1.6 KiB
Text
51 lines
1.6 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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# this is a new feature: expanding aliases when initially parsing command
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# substitutions. required by posix, so enabled in posix mode. default mode
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# stays backwards compatible.
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shopt -s expand_aliases
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set -o posix
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alias switch=case
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switch foo in foo) echo ok 1;; esac
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echo $( switch foo in foo) echo ok 2;; esac )
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echo "$( switch foo in foo) echo ok 3;; esac )"
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echo $( switch foo in (foo) echo ok 4;; esac )
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echo "$( switch foo in (foo) echo ok 5;; esac )"
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alias nest='('
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echo $( nest echo ok 6 ) )
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echo "$( nest echo ok 7 ) )"
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alias short='echo ok 8 )'
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alias DO='{ '
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alias DONE='}'
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got=$(DO
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echo ok 9; DONE)
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echo "$got"
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echo $( short
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echo "$( short "
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# remember that short" won't work because you start a new quoting context
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# inside $( and the token (`short') won't be delimited by the ending double
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# quote, so there's no opportunity to perform the alias expansion that would
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# terminate the command substitution
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