Date: Mon, 7 Jan 2008 23:31:10 -0800 From: Gary Kline <kline@magnesium.net> To: Jon Hamilton <hamilton@pobox.com> Cc: Paul Procacci <pprocacci@datapipe.com>, 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 Message-ID: <20080108073110.GB20085@thought.org> 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,
> } >
> } > 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 :)
>
You may be right since lots of us toss bats or brickbats
over seriously inconsequential things! I'm an agnostic--or
possibly a gnostic--when it comes to the [*koff*]
``religious args'' and so forth. ....I like your first method since
I'm reading a great book called AWK AND SED. Irecommend it to anybody
who's into the fine points of sed. I keep forgetting about the
"\1" in sed, but still I'm not that far alongto have come up with
your expression, :-) Impressive,thanks!
The case/esac block would have occured to me eventully, but not tonight.
Anywy, the if/predicate case is what I want. So I can gunzip, then
hand off to my cdrecord line and re-gzip. Plus, yell at me ...
or whatever.
enjoy!
gary
> --
>
> Jon Hamilton
> hamilton@pobox.com
--
Gary Kline Seattle BSD Users' Group (seabug) | kline@magnesium.net
Thought Unlimited Org's Alternate Email Site
http://www.magnesium.net/~kline
To live is not a necessity; but to live honorably...is a necessity. -Kant
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