Date: Mon, 12 Jul 2010 08:42:16 -0700 From: John Webster <jwebster@es.net> To: Aiza <aiza21@comclark.com>, questions@freebsd.org Subject: Re: .sh check for sufix g or m on size field Message-ID: <41F18D748529353AB6738881@myriad.es.net> In-Reply-To: <4C3B26B4.1000208@comclark.com> References: <4C3B26B4.1000208@comclark.com>
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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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