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Date: Mon, 12 Jul 2010 08:42:16 -0700
From: John Webster <jwebster@es.net>
To: Aiza <aiza21@comclark.com>, questions@freebsd.org
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Cc: 
Subject: Re: .sh  check for sufix g or m on size field
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--On July 12, 2010 10:29:08 PM +0800 Aiza <aiza21@comclark.com> wrote:

> Sorry miss send, was not done yet.
> 
> Have a .sh script that accepts an -s sparse file size.
> Only 2 suffix's are valid m and g.
> 
> Been trying to get this line of code to strip out just the single letter. But it strips the letter and every thing to the right of it.
> 
> Timagesize=`echo-n "${imagesize}" | sed 's/g.*$//'`
> 
> I plan to strip just the m or g if its there and the result should be numeric. If not numeric know invalid suffix.
> 
> Need help with the sed syntax. Or if there is better way I want to learn it.
> 
> Thanks

Is this what you want?

    sed -n 's/^\([0-9]\{1,\}[gm]\)$/\1/p'

    Prints output only if the input begins with digits and ends with g or m.

Or this?

    sed -n 's/^\([0-9]\{1,\}\)[gm]$/\1/p'

    Prints numeric output only if the input begins with digits and ends with g or m.


<http://www.grymoire.com/Unix/Sed.html>
<http://sed.sourceforge.net/sed1line.txt>

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