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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 SUSE

bf_tar

BF_TAR(1)																 BF_TAR(1)

NAME

       bf_tar - shell script to write a tar file of a bogofilter directory to stdout

SYNOPSIS

       bf_tar [-r] [-R] bogofilter_directory

DESCRIPTION

       bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see
       EXAMPLES below).

OPTIONS

       The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log
       files.

       The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive
       is recoverable should it become damaged. The archive may be smaller though. The default is to leave log files.

EXIT STATUS

       The script exits with status code 0 if everything went well, and nonzero if it encountered trouble.

EXAMPLES

       o  bf_tar ~/.bogofilter > outfile.tar

	  Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar.

       o  bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz

	  Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz.

       o  bf_tar `pwd`/mydirectory > outfile.tar

	  Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path.

NOTES

       This script is meant for use with Berkeley DB based bogofilter versions.

       This script requires a SUSv2 compliant pax utility.

       This script expects a SUSv2 compliant shell. Solaris systems should have the SUNWxcu4 package installed (when bogofilter is configured) so
       that /usr/xpg4/bin/sh can be used.

								    07/23/2007								 BF_TAR(1)
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