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From: "Dave Korn" <dk AT artimi DOT com>
To: "'Hughes, Bill'" <Bill DOT Hughes AT cox DOT co DOT uk>, <cygwin AT cygwin DOT com>
Subject: RE: Bogus assumption prevents d2u/u2d/conv/etal working on mixed files
Date: Tue, 6 Apr 2004 16:20:21 +0100
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X-OriginalArrivalTime: 06 Apr 2004 15:20:22.0187 (UTC) FILETIME=[AD9707B0:01C41BEA]

> -----Original Message-----
> From: cygwin-owner On Behalf Of Hughes, Bill
> Sent: 06 April 2004 14:59

> > Sent: 06 April 2004 14:10  From: fergus AT xxxxxxxxxxxxxxxx
> ..snip..
> 
> > 
> > Please can you tell me how to grep for an ASCII 00 (and for 
> > that matter
> > anything from ASCII 1B to 1F, and 7F to FF)?
> I'm no expert but
> grep [\x00] foo.bar
> might be what you're after.

Nope.  That will grep for a lower case x or a zero:

DKAdmin AT ubik /swtools/windows/bin> echo "abcxdef" > test1.txt
DKAdmin AT ubik /swtools/windows/bin> echo "0123456" > test2.txt
DKAdmin AT ubik /swtools/windows/bin> grep [\x61] test?.txt
test1.txt:abcxdef
test2.txt:0123456
DKAdmin AT ubik /swtools/windows/bin> grep [\x16] test?.txt
test1.txt:abcxdef
test2.txt:0123456

  grep is not printf, and an escaped shell metacharacter is not the same
thing as a C-compiler escaped control char sequence in a string literal:

DKAdmin AT ubik /swtools/windows/bin> grep [\r] test?.txt
DKAdmin AT ubik /swtools/windows/bin> grep [\n] test?.txt
DKAdmin AT ubik /swtools/windows/bin> echo >>test1.txt
DKAdmin AT ubik /swtools/windows/bin> grep [\n] test?.txt
DKAdmin AT ubik /swtools/windows/bin> grep [\r] test?.txt
DKAdmin AT ubik /swtools/windows/bin> wc -l test1.txt
      2 test1.txt
DKAdmin AT ubik /swtools/windows/bin>

    cheers, 
      DaveK
-- 
Can't think of a witty .sigline today....


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