Date: Thu, 24 Jun 2010 09:38:33 -0700 From: Carl Johnson <carlj@peak.org> To: freebsd-questions@freebsd.org Subject: Re: .sh check for numeric content Message-ID: <87lja4mlme.fsf@cjlinux.localnet> In-Reply-To: <20100624033257.2D074BEA6@kev.msw.wpafb.af.mil> (Karl Vogel's message of "Wed\, 23 Jun 2010 23\:32\:57 -0400 \(EDT\)") References: <4C22B3D7.6070102@comclark.com> <20100624033257.2D074BEA6@kev.msw.wpafb.af.mil>
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vogelke+unix@pobox.com (Karl Vogel) writes:
>>> On Thu, 24 Jun 2010 09:24:39 +0800,
>>> Aiza <aiza21@comclark.com> said:
>
> A> Receiving a variable from the command line that is suppose to contain
> A> numeric values. How do I code a test to verify the content is numeric?
>
> The script below will work with the Bourne or Korn shell.
> Results for "0 1 12 1234 .12 1.234 12.3 1a a1":
>
> 0 is numeric
> 1 is numeric
> 12 is numeric
> 1234 is numeric
> .12 is numeric
> 1.234 is numeric
> 12.3 is numeric
> 1a is NOT numeric
> a1 is NOT numeric
You might want to try testing "123..45".
I tried changing:
> if expr "$arg" : "[0-9]*[\.0-9]*$" > /dev/null
to:
if expr "$arg" : "[0-9]*\.*[0-9]*$" > /dev/null
but it still claims that it is numeric, so *I* must be missing
something.
--
Carl Johnson carlj@peak.org
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