Shell Programming and Scripting

Hi,

I have one file like 00123. And this file name is generated as a sequence.

So how can I confirm the generated file name is a number, not a special character or alphabets.

Can anybody help me out.

Thanks in advance.

Hi,

try this,

Code:

#!/usr/bin/perl

$filename = "00123";

if ( $filename =~ /\b\d{1,5}\b/ ) { print "Numeric \n";}
else { print "Not numeric \n"'; }

A shell way. Test by removing all numbers and see what's left.

Code:

if [ -z "`echo ${filename} | tr -d '0123456789'`" ]
then
        echo "${filename} is numeric"
fi

If you would have consulted our archives and searched for "test numbers" you might have found the following thread:

Check if the input is number or text?

You might also have searched for "check numbers" and you would have found this thread:

How to validate input parameters?

Which contains an in-depth discussion about exactly your problem in specific and input validation in general.

You could also search our archives for "input validation" and get 4 pages of hits in thread display - i haven't checked them all for relevancy, but i remember at least several of them as being related to your problem.

Google is your friend and the archive of this website is your ally. You generally get answers faster by searching the answers already given to others with similar (or even identical) problems as you then put the umpteenth thread dealing with a commonday problem here and expect people who have answered the same question already dozens of times to give you a genuine and elaborate answer.

I hope this helps.

bakunin