mirror of
https://https.git.savannah.gnu.org/git/bash.git
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Chet Ramey
52 lines
1.2 KiB
Plaintext
52 lines
1.2 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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# test expression evaluation with unset variables
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set -u
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( echo $(( a > 4 )) ; echo after 1 ) # error
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( echo $(( a[0] > 4 )); echo after 2) # error
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set +u
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( echo $(( a > 4 )) ; echo after 3 $? )
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( echo $(( a[0] > 4 )); echo after 4 $?)
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# this is a recursion stack error
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a=b
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b=a
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echo $(( a + 7 ))
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# make sure command printing works for arithmetic expansions and commands
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set -x
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var=42
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echo $(( $var ))
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echo $?
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echo $(( $null ))
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echo $?
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(( $var ))
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echo $?
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(( $null ))
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echo $?
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set +x
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# invalid expressions in different cases
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x=4+
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declare -i x
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x+=7 y=4
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echo x = $x y = $y
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