Shell script: Logical operator precedence

[SGK]

Hi All,

How to specify the precedence in the if/while loop?

In C,

if( ik || k
Like that, how to do the precedence in Shell script?

Thanks in advance.

[Sergejs Svitnevs · Accepted solution]

You can make logical expressions by grouping them with -a and -o operators (similar to the && and || operators).


if [ $i -lt $j ] && [ $j -gt $k -o $k -lt $i ] ; then
<...>
fi

Regards

[Peter Nikitka]

Hi,

that depends on the shell you are using.
In ksh or bash you can use:

if [[ $i < $j && ($j > $k || $k < $i) ]]
then echo true
else echo false
fi

mfG Peter

[SGK]

Hi,

Thanks all for the response.

[Peter Nikitka]

Hi,

since you are new to this forum, I may put your attention to this:

http://forums1.itrc.hp.com/service/forums/helptips.do?#28

mfG Peter