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Full Discussion: archiving equal sets of files from directories
Top Forums Shell Programming and Scripting archiving equal sets of files from directories Post 302182448 by era on Sunday 6th of April 2008 01:15:54 PM
Old 04-06-2008
Is the list of files stable, or might new files appear while you are processing the files you have so far?

I would try to come up with a system for dividing the files (maybe just a simple grep expression) and once you are satisified with that, feed it to | xargs tar cf -

If you have numeric file names, you could simply sort by the last digit modulo three. If the list of files doesn't change, you could even just categorize by line number within the list, but then you won't get the same files next time you run this on a set of files which is almost, but not quite identical.

Code:
awk 'NR % 3 == 0'  list>set1
awk 'NR % 3 == 1' list >set2
awk 'NR % 3 == 2' list >set3

Here, I suppose you could have run a find command to generate the file list -- if the list of files will not change while you are doing this, you could re-run find three times, if you want to avoid using a temporary file.

Code:
for m in 0 1 2 ; do
  find -what -ever | awk -v m=$m 'NR % 3 == m' | xargs tar cf tar$m.tar
done

Instead of tar, you could run it with wc to see that the number of files is roughly similar for all three runs, before you proceed to actually tar them up.

There may be architectures where xargs or tar are too crippled for this, but if you can use this, it's simple and straightforward.
 

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LEARN ABOUT CENTOS

ptargrep

PTARGREP(1)						User Contributed Perl Documentation					       PTARGREP(1)

NAME

       ptargrep - Apply pattern matching to the contents of files in a tar archive

SYNOPSIS

	 ptargrep [options] <pattern> <tar file> ...

	 Options:

	  --basename|-b     ignore directory paths from archive
	  --ignore-case|-i  do case-insensitive pattern matching
	  --list-only|-l    list matching filenames rather than extracting matches
	  --verbose|-v	    write debugging message to STDERR
	  --help|-?	    detailed help message

DESCRIPTION

       This utility allows you to apply pattern matching to the contents of files contained in a tar archive.  You might use this to identify all
       files in an archive which contain lines matching the specified pattern and either print out the pathnames or extract the files.

       The pattern will be used as a Perl regular expression (as opposed to a simple grep regex).

       Multiple tar archive filenames can be specified - they will each be processed in turn.

OPTIONS

       --basename (alias -b)
	   When matching files are extracted, ignore the directory path from the archive and write to the current directory using the basename of
	   the file from the archive.  Beware: if two matching files in the archive have the same basename, the second file extracted will
	   overwrite the first.

       --ignore-case (alias -i)
	   Make pattern matching case-insensitive.

       --list-only (alias -l)
	   Print the pathname of each matching file from the archive to STDOUT.  Without this option, the default behaviour is to extract each
	   matching file.

       --verbose (alias -v)
	   Log debugging info to STDERR.

       --help (alias -?)
	   Display this documentation.

COPYRIGHT

       Copyright 2010 Grant McLean <grantm@cpan.org>

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2013-05-12							       PTARGREP(1)
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