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Full Discussion: Extracting file from .tar.gz file
Top Forums Shell Programming and Scripting Extracting file from .tar.gz file Post 302836663 by Don Cragun on Wednesday 24th of July 2013 01:11:50 PM
Old 07-24-2013
Quote:
Originally Posted by Corona688
You don't need to store the entire decompressed file on disk.

Code:
gunzip -c < file.tar.gz | tar -xf - filename1 filename2 filename3

Or on some systems, just
Code:
tar -zxf file.tar.gz filename1 filename2 filename3

As far as I know you can't extract all files beginning with a certain string though.

It has to scan the whole file to find the ones you want.
True, but you can make one pass to get the names of the files in the tar archive and save the names of the files you want using grep (or some other tool) and then extract the files you want on a second pass. The 1st pass would be something like:
Code:
tar -ztf file.tar.gz | grep -E '(^|/)D.*T(/|$)'

Again, this does not save the entire uncompressed archive to disk. And, of course, if you try this and find that it gives you the list of files you want, you could try:
Code:
tar -zxf file.tar.gz $(tar -ztf file.tar.gz | grep -E '(^|/)D.*T(/|$)')

as long as the list of filenames to be processed doesn't cause that command line to overflow your system's ARG_MAX limit.
 

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LEARN ABOUT CENTOS

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							    10/22/2012								 BF_TAR(1)
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