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Chet Ramey
39 lines
578 B
Plaintext
39 lines
578 B
Plaintext
# 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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