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Top Forums Shell Programming and Scripting Elegant gunzip of tar Contents Post 302263726 by scotbuff on Tuesday 2nd of December 2008 10:52:44 AM
Old 12-02-2008
Thanks But

Quote:
Originally Posted by vbe
...

Now I know why Im not going to change my way of working:
Make a tar file first then gzip
using it is:
gzcat <tarfile>.tar.gz |tar -tvf - (or xvf...)
Normally this is how I work as well. But there were space constraints on the server where they did not have room to create the tar file first without first gzipping all the files.

Anyway, I found a solution and thought I would post my findings if someone faces a similar situation. Seems tar's output is standard error rather than standard out. Notice the change to how I am piping the output.

ls *.tar | while read tarfilename
do
tar xvf ${tarfilename} 2>&1| awk '{print $2}' |sed 's/,//g' |xargs -i gunzip -fdrv {}
done
 

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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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