mirror of https://github.com/n-hys/bash.git
60 lines
1.3 KiB
Plaintext
60 lines
1.3 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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# This isn't perfect behavior, but it establishes a baseline and will provide
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# a way to detect behavior changes
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echo a1
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a[0]= a[1]=; recho "${a[@]:-y}"
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unset a
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echo a2
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a[1]=; recho "${a[@]:-y}"
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a[1]=; recho "${a[*]:-z}"
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unset a
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echo a3
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a[0]= a[1]=x; recho "${a[@]:-y}"
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unset a
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echo a4
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a[0]= a[1]=x; recho ${a[@]:+y}
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unset a
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echo p1
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set '' ''
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recho "${@:-y}"
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shift $#
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echo p2
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set '' x
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recho "${@:-y}"
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shift $#
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echo p3
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set '' x
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recho ${@:+y}
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# problems with * and null expansions dating back to bash's earliest days
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A=(''); set -- ''
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echo "<${A[*]:-X}>" "<${*:-X}>" "<${A:-X}>" "<${A[0]:-X}>"
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IFS=
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A=('' ''); set -- '' ''
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B=''
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echo "<${A[*]:-X}>" "<${*:-X}>" "<${B:-X}>" "<${B[*]:-X}>"
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