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Date: Tue, 8 Jan 2008 00:01:18 -0600
From: Jon Hamilton <hamilton@pobox.com>
To: Paul Procacci <pprocacci@datapipe.com>
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References: <20080108051058.GA19698@thought.org>
	<20080108053408.GA95218@procacci.kicks-ass.org>
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Cc: Gary Kline <kline@magnesium.net>,
	FreeBSD Mailing List <freebsd-questions@FreeBSD.ORG>
Subject: Re: is there a /bin/sh method to tell the ending of a file
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} 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,
} > 
} > Is there an easy way of determing whether a string//filename ends in
} > *.gz? using /bin/sh?  I spend around 20 minutes cobbling together 
} > scripts to burn ISO files last night.  Then blindly wasted one CD-R file that 
} > was gzipped..... tar barfs on you,but cdrecord dev=foo.gz writes
} > exactly that.   I'd like to add a line that yells at me, then gunzips and does 
} > an MD5; then writes.   (In C, no prob; C lets me fly, but not /bin/sh.
} > But anyway, if any guru can clue me in, thanks. I think my brain is in Maui
} > for a few days.
} > 

} Is this what you mean?
} 
} ---------------------
} #!/bin/sh
} 
} STRING="mystring.gz"
} 
} if [ ".gz" = "`echo \"$STRING\" | sed -n 's/.*\(\.gz\)$/\1/p'`" ]; then
}  echo test;
} fi
} 
} -----------------------

Works (I assume) but perhaps easier to read and more "native" might be:

case "$STRING" in
*\.gz)
  echo "Found .gz suffix"
  ;;
*)
  echo "Not a .gz suffix"
  ;;
esac

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 
decades :)

-- 

   Jon Hamilton 
   hamilton@pobox.com