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

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
Ksh How to test if variable is numeric??	developncode	UNIX for Dummies Questions & Answers	8	03-19-2009 06:42 PM
Test variable	javeed7	Shell Programming and Scripting	2	04-19-2008 07:59 PM
Test whether absolute path in variable	dkieran	Shell Programming and Scripting	2	05-21-2007 05:14 PM
test Null variable	kykyboss	Shell Programming and Scripting	1	11-24-2006 12:02 PM
How to test if a variable is in the right format	dbrundrett	Shell Programming and Scripting	2	07-05-2004 07:05 AM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by