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Full Discussion: Elegant gunzip of tar Contents
Top Forums Shell Programming and Scripting Elegant gunzip of tar Contents Post 302260661 by scotbuff on Friday 21st of November 2008 10:51:48 AM
Old 11-21-2008
Elegant gunzip of tar Contents
I am faced with a situation where I have directories of gunzipped contents bundled into a tar file. It might look something like this.
x coop/batch/bin/ha90x20.gz, 632641 bytes, 1236 tape blocks
x coop/batch/icm/HA90X20.icm.gz, 1821 bytes, 4 tape blocks
x coop/batch/aeenv.gz, 4117 bytes, 9 tape blocks
x lib/libiclm.a.gz, 5998416 bytes, 11716 tape blocks
x lib/libiclm.sl.gz, 5260938 bytes, 10276 tape blocks
x lib/libime.a.gz, 5816597 bytes, 11361 tape blocks
x lib/libime.sl.gz, 4856468 bytes, 9486 tape blocks
x lib/libimisc.a.gz, 5497949 bytes, 10739 tape blocks
x lib/libimisc.sl.gz, 4591464 bytes, 8968 tape blocks
x lib/libipc.a.gz, 1250457 bytes, 2443 tape blocks
x lib/libipc.sl.gz, 1102578 bytes, 2154 tape blocks
x lib/libipr.a.gz, 5148901 bytes, 10057 tape blocks
x lib/libipr.sl.gz, 4334738 bytes, 8467 tape blocks
This is a small sample, we always have quite a bit more that could be completely different files. Anyway, we have always done a "tar xvf" on the tar files, followed by a find and gunzip of all files that are gunzipped. A problem has arose where there are files that already exist that the customer has gzipped. Is there an elegant way I can pipe the contents of the tar files through gunzip so that I only gunzip the contents of the tar file all in one fell swoop.

I have tried something like this but the gunzip never executes, I receive no errors, it just does not seem to execute.
ls *.tar | while read tarfilename
do
tar xvf ${tarfilename} |awk '{print $2}' |sed 's/,//g' |xargs -i gunzip -fdrv {}
done

I am on HPUX. I am leaning toward the need to write the output of the tar command to a file and work from that, but why can I not use that output on the fly? Thanks in advance.
 

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LEARN ABOUT DEBIAN

bf_tar

BF_TAR(1)						    Bogofilter Reference Manual 						 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.

AUTHORS

       Matthias Andree

Bogofilter							    03/15/2010								 BF_TAR(1)
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