Date: Tue, 13 Jul 2010 08:59:54 +0800 From: Aiza <aiza21@comclark.com> To: Anonymous <swell.k@gmail.com> Cc: "questions@freebsd.org" <questions@freebsd.org> Subject: Re: .sh check for sufix g or m on size field Message-ID: <4C3BBA8A.3020305@comclark.com> In-Reply-To: <867hl0ems5.fsf@gmail.com> References: <4C3B26B4.1000208@comclark.com> <867hl0ems5.fsf@gmail.com>
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Anonymous wrote:
> 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
>
This is real close but it allows a numeric value through as valid which
is not a valid condition. The $size value has to be suffixed with g or m
to be valid. A numeric value only or a numeric value suffixed with
anything else than m or g is invalid.
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