Date: Thu, 24 Jun 2010 05:19:53 +0200 From: Thomas Keusch <fwd@bsd-solutions-duesseldorf.de> To: RW <rwmaillists@googlemail.com> Cc: freebsd-questions@freebsd.org Subject: Re: .sh check for numeric content Message-ID: <20100624031953.GA21766@gothschlampen.com> In-Reply-To: <20100624034434.7a6c2895@gumby.homeunix.com> References: <4C22B3D7.6070102@comclark.com> <20100624013755.GA5009@gothschlampen.com> <20100624034434.7a6c2895@gumby.homeunix.com>
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On Thu, Jun 24, 2010 at 03:44:34AM +0100, RW wrote: Hello, > 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. tk@eternity:~$ b=5 tk@eternity:~$ case "$b" in > [0-9] ) > echo numeric > ;; > * ) > echo alpha > ;; > esac numeric tk@eternity:~$ Works for me. Another solution would be like this: if echo "$b" | egrep -q '^[0-9]+$'; then and eventual variants of it. Regards Thomas
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