Date: Mon, 12 Jul 2010 19:35:06 +0400 From: Anonymous <swell.k@gmail.com> To: Aiza <aiza21@comclark.com> Cc: "questions@freebsd.org" <questions@freebsd.org> Subject: Re: .sh check for sufix g or m on size field Message-ID: <867hl0ems5.fsf@gmail.com> In-Reply-To: <4C3B26B4.1000208@comclark.com> (Aiza's message of "Mon, 12 Jul 2010 22:29:08 %2B0800") References: <4C3B26B4.1000208@comclark.com>
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Aiza <aiza21@comclark.com> writes:
> 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 "${imagesize}" | sed 's/g.*$//'`
You didn't state what's your input. I guess smth like following will do
strip() {
local size=
if printf >&- 2>&- %g ${size:=${1%[gm]}}; then
echo "it's a \`$size' without suffix"
else
echo "$1 has invalid suffix"
fi
}
$ strip 17m
it's a `17' without suffix
$ strip 33g
it's a `33' without suffix
$ strip 25gm
25gm has invalid suffix
>
> 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.
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