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From: "Brian Wilson" <wilson AT ds DOT net>
To: Andrey Repin <cygwin AT cygwin DOT com>
Subject: Re: diff issue
Date: Thu, 30 Sep 2010 22:20:24 -0400
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>>> Let's say I have two versions of the same batch file:
>>> The old version from CVS:
>>> 
>>> > rem $Id: backup.bat,v 1.1 2007/07/17 01:53:30 Daemon Exp $
>>> > rar a -ag-YYYY-MM-DD_HH-MM -- MinerTimer @MinerTimer.list
>>> 
>>> The new version I've imported to Subversion:
>>> 
>>> > @echo off
>>> > rem $Id: backup.bat 10 2010-09-30 01:22:14Z anrdaemon $
>>> > rar a -ag-YYYY-MM-DD_HH-MM -- MinerTimer @MinerTimer.list
>>> 
>>> When I'm comparing them with my usual macro
>>> diff -bdu -x "CVS" -x ".svn" -I "\$Id.*\$" -I "\$Revision.*\$" -I 
>>> "\$Date.*\$" -I "\$Author.*\$" --strip-trailing-cr -- '1/backup.bat' 
>>> 'backup.bat'
>>> 
>>> It telling me that $Id$ lines are differ.
>>> But when I remove the "@echo off" from second file, it telling me 
>>> that files are "identical" (the expected result).
>>> 
>>> Having hard times dechiphering man diff, so if anyone can enlighten 
>>> me in simple words on the matter, I'd appreciate help greatly.
> 
>> Be sure the end of line characters are correct on the "@echo" line.  You 
>> should be able to do this with a "cat -vTE" command.
> 
> They are "correct" for windows batch fine (CRLF) and consistent for both
> files.  However, changing line endings didn't changed the end result. I'm leaning
> towards diff specifics in treatment of ignored lines in scope of actually
> changed lines.
> 
> :) If my English was the same as your Russian, accept my deepest apology.

Your English is fine.  I used Google translate to try and make my response easier for you.  I guess that didn't happen, so 
the fault is mine.

Try changing the "@echo" line to something else and see if you still get the same results.  Also try removing some of the -I 
cases and see if that makes a difference in the results.  This could lead you to the answer if one of the patterns is causing 
the problem.  Lastly do you need to use the "-x PATtern" exclusion options?  You are already specifying the two files to diff 
so you shouldn't need these options.

I'm not sure what the "--" argument is used for (before the file names) though.  I would also try naming the directory in the 
"1/backup.bat" argument something other than "1".

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