From owner-freebsd-questions@FreeBSD.ORG  Thu Jun 24 02:44:39 2010
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Date: Thu, 24 Jun 2010 03:44:34 +0100
From: RW <rwmaillists@googlemail.com>
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Subject: Re: .sh  check for numeric content
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On Thu, 24 Jun 2010 03:37:55 +0200
Thomas <fwd@gothschlampen.com> wrote:

> On Thu, Jun 24, 2010 at 09:24:39AM +0800, Aiza wrote:
> 
> Hello,
> 
> > Receiving a variable from the command line that is suppose
> > to contain numeric values.
> > 
> > How do I code a test to verify the content is  numeric?
> 
> http://www.google.com/search?q=shell+test+if+variable+numeric
> 
> First link =>
> http://www.unix.com/shell-programming-scripting/46276-check-variable-if-its-non-numeric.html
> 
> Gosh, Google is full of answers these days..

I'd suggest looking a bit further down the list since the quoted first
link is patently wrong.