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combination between || and && in IF condition with ksh

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# 1  
Old 02-15-2010
combination between || and && in IF condition with ksh
Dear All,
Please advice about this issue.
when i run this line in a script
Code:
if [ "${x}" = "test3" ] && [ "${y}" != "test3" ] || [ "${x}" = "test2" ] && [ "${y}" != "test2" ] || [ "${x}" = "test1" ] && [ "${y}" != "test1" ]

if i enter $x = test3 and $y = test1 the If condition apply while it should not
Best Regards
Last edited by islam.said; 02-15-2010 at 07:56 AM.. Reason: code tags, please...
# 2  
Old 02-15-2010
I don't think that "&&" and "||" are suitable for nested conditions. Paraphrasing the condition into nested "ands" and "ors" we get.

Code:
#!/bin/ksh
x="test3"
y="test1"
if [ \( "${x}" = "test3" -a "${y}" != "test3" \) -o \( "${x}" = "test2" -a "${y}" != "test2" \) -o \( "${x}" = "test1" -a "${y}" != "test1" \) ]
then
        echo "true"
else
        echo "false"
fi

true

Was this what you meant?
# 3  
Old 02-15-2010
thank you so much
it works gr8
Smilie
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