mirror of
https://https.git.savannah.gnu.org/git/bash.git
synced 2026-06-21 21:07:57 +02:00
Chet Ramey
66 lines
1.5 KiB
Plaintext
66 lines
1.5 KiB
Plaintext
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
#
|
|
|
|
# posix-mode alias expansion in nofork command substitutions within
|
|
# other constructs
|
|
|
|
DATE='Mon Aug 29 20:03:02 EDT 2022'
|
|
shopt -s expand_aliases
|
|
|
|
alias number="echo 123"
|
|
|
|
echo ${ number; }
|
|
echo $(( ${ number; } ))
|
|
(( ${ number; } )) ; echo $?
|
|
|
|
set -o posix
|
|
echo ${ number; }
|
|
echo $(( ${ number; } ))
|
|
(( ${ number; } )) ; echo $?
|
|
set +o posix
|
|
|
|
# have to turn it back on after leaving posix mode
|
|
shopt -s expand_aliases
|
|
|
|
alias my_alias='echo $DATE'
|
|
|
|
echo ${ eval my_alias; }
|
|
echo ${ my_alias; }
|
|
|
|
set -o posix
|
|
echo ${ eval my_alias; }
|
|
echo ${ my_alias; }
|
|
set +o posix ; shopt -s expand_aliases
|
|
|
|
alias e=echo
|
|
alias v='e 123'
|
|
|
|
set -o posix
|
|
echo ${ v; }
|
|
echo ${ echo before ; v; }
|
|
echo ${ for f in 0; do
|
|
echo in for
|
|
done; v; }
|
|
set +o posix ; shopt -s expand_aliases
|
|
|
|
alias let='let --'
|
|
|
|
let '1 == 1'
|
|
: ${ let '1 == 1'; }
|
|
|
|
set -o posix
|
|
let '1 == 1'
|
|
: ${ let '1 == 1'; }
|
|
set +o posix ; shopt -s expand_aliases
|