Date: Tue, 8 Jan 2008 09:56:15 -0800 From: Christopher Cowart <ccowart@rescomp.berkeley.edu> To: questions@freebsd.org Subject: Re: is there a /bin/sh method to tell the ending of a file Message-ID: <20080108175615.GP96147@hal.rescomp.berkeley.edu> In-Reply-To: <20080108060118.GF1965@woodstock.nethamilton.net> References: <20080108051058.GA19698@thought.org> <20080108053408.GA95218@procacci.kicks-ass.org> <20080108060118.GF1965@woodstock.nethamilton.net>
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On Tue, Jan 08, 2008 at 12:01:18AM -0600, Jon Hamilton wrote:
> } On Mon, Jan 07, 2008 at 09:10:58PM -0800, Gary Kline wrote:
> } Paul Procacci <pprocacci@datapipe.com>, said on Mon Jan 07, 2008 [11:34=
:08 PM]:
> } > Hi All,
> } >=20
> } > Is there an easy way of determing whether a string//filename ends in
> } > *.gz? using /bin/sh? =20
>=20
> } Is this what you mean?
> }=20
> } ---------------------
> } #!/bin/sh
> }=20
> } STRING=3D"mystring.gz"
> }=20
> } if [ ".gz" =3D "`echo \"$STRING\" | sed -n 's/.*\(\.gz\)$/\1/p'`" ]; th=
en
> } echo test;
> } fi
> }=20
> } -----------------------
>=20
> Works (I assume) but perhaps easier to read and more "native" might be:
>=20
> case "$STRING" in
> *\.gz)
> echo "Found .gz suffix"
> ;;
> *)
> echo "Not a .gz suffix"
> ;;
> esac
>=20
> Sh is a pretty versatile creature; I'm sure there are a thousand more ways
> all of which work, and some of which will cause religious arguments for=
=20
> decades :)
Right. Here's another way using parameter expansion:
| if [ ${STRING##*.} =3D gz ] ; then
| echo true
| else
| echo false
| fi
The syntax is terse, but pretty popular in the /etc/rc family of scripts.=
=20
--=20
Chris Cowart
Lead Systems Administrator
Network & Infrastructure Services, RSSP-IT
UC Berkeley
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