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Re: Grepping a directory of files

  • Subject: Re: Grepping a directory of files
  • From: Roy Schestowitz <newsgroups@xxxxxxxxxxxxxxx>
  • Date: Mon, 07 Nov 2005 03:20:25 +0000
  • Newsgroups: uk.comp.os.linux
  • Organization: schestowitz.com / MCC / Manchester University
  • References: <1131297397.24932.65.camel@localhost> <TO1rVIMFZmbDFwtD@dev.null.davjam.org>
  • Reply-to: newsgroups@xxxxxxxxxxxxxxx
  • User-agent: KNode/0.7.2
__/ [David Bolt] on Sunday 06 November 2005 20:23 \__

> On Sun, 6 Nov 2005, Paul F. Johnson <paul@xxxxxxxxxxxxxxxxxxxxxx>
> wrote:-
>>I'm trying to sort through about 3Gb of data files recovered from a hard
>>drive and in particular, am looking for certain phrases in a file (such
>>as GIF89a, JFIF and one from a work processor).
>>How would I grep through an entire directory of files and then move the
>>ones containing the lines to another directory for examination?
> There's probably much more elegant, shorter, and/or quicker methods, but
> here's one that should do the job:
> grep -a -l "JFIF" * | \
> awk -F: '{print $1}'| \
> while read i ; do cp "$i" /wherever/you/want/the/files ; done
> Just replace JFIF to match other identifying strings, and the
> destination, as required.
> Regards,
>   David Bolt

I suspect that the above assumes all files reside in the same directory. Let
us say that all 3 lines were saved under a file named move_jfif.sh. You
could then use global.sh (see below)

        # global - execute command in all subdirectories

        exec 3<&0               # save standard input
        find . -type d -print | # print all directory names
            while read dirname
                (cd $dirname
                exec 0<&3       # restore standard input
                "$@"            # run command
        exec 3<&-               # close file descriptor

Then make the call:


I guess this would cover more complex circumstances. By no means do I
criticise David's advice, which is excellent.

Hope it helps,


Roy S. Schestowitz      | Data lacking semantics is currency in an island
http://Schestowitz.com  |    SuSE Linux     |     PGP-Key: 0x74572E8E

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