find + sh + grep

[Kirk Korver]

Dear Sir or Madam:

 

I cannot discover what I am doing wrong here, so perhaps you could correct
my error. 

 

 

I have a file, named bp_fs.h. It has windows type line endings, and is a
text file. The first lines look like

 

 

/* (c) Copyright 2011 

$Header: 

*/

/*
----------------------------------------------------------------------------

//

//  Filename:  bp_fs.h

 

 

 

 

And here is what I am trying to do:

 

1)      Find all files

a.       Of type "file"

b.      Whose name is bp_fs.h (usually this would be "ends with a .c or a
.h", but I was trying to debug)

                                                               i.      Where
the first 5 lines do NOT contain

                                                             ii.      The
text    $Header: $            Please note that there are optional characters
after the colon, before the final $

2)      If this is all true, then output the name of the file.

 

 

Now to the script I run

 

find . -type f -name bp_fs.h ! -exec sh -c "cat {} | head -n 5 | grep -q
'\$Header:.*\$'" \; -print

 

The problem is that it does not output the name of the file in question.

 

If I run this script instead, I get the following output

 

 

 

address@hidden /cygdrive/c/code

$ find . -type f -name bp_fs.h ! -exec sh -c "cat {} | head -n 5 | grep
'\$Header:.*\$'" \; -print

$Header:

 

address@hidden /cygdrive/c/code

 

 

 

 

The difference is that grep does not have the -q, so it correctly outputs
the matched line. Only, I do not believe that I should have a match.

 

 

 

 

In fact, if I do the following (these were all pasted from the screen) in
order

 

address@hidden /cygdrive/c/code

$ find . -type f -name bp_fs.h ! -exec sh -c "cat {} | head -n 5 | grep -q
'\$Header:.*\$'" \; -print

 

address@hidden /cygdrive/c/code

$ find . -type f -name bp_fs.h ! -exec sh -c "cat {} | head -n 5 | grep
'\$Header:.*\$'" \; -print

$Header:

 

address@hidden /cygdrive/c/code

$ grep  '\$Header:.*\$' bp_fs.h

 

address@hidden /cygdrive/c/code

$ grep  '\$Header:.*' bp_fs.h

$Header:

 

address@hidden /cygdrive/c/code

 

 

 

The last two times, I was just trying the grep by itself. I think this
experiment shows that grep does not find a match of $Header.....$, mostly
because there is not one, but somehow I am getting a match on the
complicated    find + sh + grep combination. I am sure I am missing
something, but I do not know what.

 

Are you able to shed some light on this?

 

Kind regards,

Kirk

 

 

P.S.

 

address@hidden /cygdrive/c/code

$ uname -a

CYGWIN_NT-5.1 kirk-xp960 1.7.9(0.237/5/3) 2011-03-29 10:10 i686 Cygwin

 

address@hidden /cygdrive/c/code

$ grep --version

GNU grep 2.6.3

 

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