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Date: Sat, 21 Aug 2004 20:05:34 -0400
From: "Pierre A. Humblet" <pierre DOT humblet AT ieee DOT org>
To: cygwin AT cygwin DOT com
Subject: Re: grep: $ in PATTERN doesn't seem to work properly
Message-ID: <20040822000534.GA1110049@hpn5170>
References: <NGBBLLIAMFLGJEOAJCCEEEDPDNAA DOT _garbage_collector_ AT telia DOT com> <Pine DOT GSO DOT 4 DOT 61 DOT 0408211845500 DOT 19750 AT slinky DOT cs DOT nyu DOT edu>
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Resent-From: "Pierre A. Humblet" <pierre DOT humblet AT ieee DOT org>
Resent-Date: Sat, 21 Aug 2004 20:34:15 -0400
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On Sat, Aug 21, 2004 at 07:07:21PM -0400, Igor Pechtchanski wrote:
> On Sat, 21 Aug 2004, Hannu E K Nevalainen wrote:
> 
> > Note that there is a difference depending on how you create the file; I'll
> > hand over to cygwin-specialists to explain (or ponder on) why it has to be
> > this way.
> > 
> > I'm running BINARY mounts all over, still I get the behaviour below.
> > [snip]
> > === a) ===
> > $ cd			# cd to $HOME
> > $ cat >tmp
> > Line 1
> > Line 2
> > 
> > Line 3
> > Line 4
> > Line 5
> > $POSIX="" - Hannu AT P450 ~ bash (P)PID=(852)2340, s=0
> > $ od -w8 -t x1z tmp
> > 0000000 4c 69 6e 65 20 31 0d 0a  >Line 1..<
> > 0000010 4c 69 6e 65 20 32 0d 0a  >Line 2..<
> > 0000020 0d 0a 4c 69 6e 65 20 33  >..Line 3<
> > 0000030 0d 0a 4c 69 6e 65 20 34  >..Line 4<
> > 0000040 0d 0a 4c 69 6e 65 20 35  >..Line 5<
> > 0000050 0d 0a                    >..<
> > 0000052
> > $ grep '1$' tmp
> > $ d2u tmp 				# dos2unix
> > tmp: done.
> > $ grep '1$' tmp
> > Line 1
> > 
> > === b) ===
> > $ cd
> > $ ls -l tmp2
> > ls: tmp2: No such file or directory
> > $ for (( i=1 ; i<6 ; i++ )) do echo >>tmp2 "Line $i";done
> > $ od -w7 -t x1z tmp2
> > 0000000 4c 69 6e 65 20 31 0a  >Line 1.<
> > 0000007 4c 69 6e 65 20 32 0a  >Line 2.<
> > 0000016 4c 69 6e 65 20 33 0a  >Line 3.<
> > 0000025 4c 69 6e 65 20 34 0a  >Line 4.<
> > 0000034 4c 69 6e 65 20 35 0a  >Line 5.<
> > 0000043
> > $ grep '1$' tmp
> > Line 1
> > 
> > $ rm tmp tmp2
> 
> This has to do with the way "cat" behaves.  By default, Windows sends 
> textmode line endings from the console.  Most applications (including od, 
> echo, bash, etc) compensate for this somehow, except "cat", which *always* 
> replicates the output character by character, doing no processing 
> *whatsoever*.  AFAIK, this is by design.
> 
> Case in point:
> 
> $ od -c
> <Enter><Ctrl-D>
> 0000000  \n
> 0000001
> $ cat | od -c
> <Enter><Ctrl-D>
> 0000000  \r  \n
> 0000002
> $ perl -pe 1 | od -c
> <Enter><Ctrl-D>
> 0000000  \n
> 0000001
> $ # Note, however:
> $ perl -pe 1 | cat | od -c
> <Enter><Ctrl-D>
> 0000000  \n
> 0000001
> $ 

See also <http://www.cygwin.com/ml/cygwin/2003-04/msg02268.html>
I once sent a patch to a transient coreutils maintainer but
there was no followup.

Pierre

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