variable numerical test

tostay2003 · 01-05-2009, 01:46 PM

Hi

I have a variable which should be any number between 1 and 50.

It could also be any string/empty string.

I have a code written below. The point is when the variable contains string.
I don't want the code below to error out. Instead fall in the else bucket.

Code:

[ $var -lt 1 -o $var -gt 50 ] && dothis_1 || dothis_2

pixellany · 01-05-2009, 01:57 PM

How about testing the return code for the "test" ([) function? eg:

if $?; then <something>; fi

colucix · 01-05-2009, 03:34 PM

Here is a dirty but effective way:

Code:

[ $var -lt 1 -o $var -gt 50 2> /dev/null ] && dothis_1 || dothis_2

tostay2003 · 01-05-2009, 05:10 PM

Thanks for the help.