variable numerical test

tostay2003 · #1 (**permalink**) 01-05-2009

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

cfajohnson · #2 (**permalink**) 01-06-2009

Quote:

Originally Posted by tostay2003

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.

You don't have an "else bucket"; dothis_2 will be executed if either the numerical test or dothis_1 fails.

Quote:

Code:

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

Code:

if case $var in
  *[!0-9]* | "" ) false ;;
  *) true ;;
esac && [ $var -ge 1 ] && [ $var -le 50 ]
then
  echo dothis_1
else
  echo dothis_2
fi

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