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Full Discussion: tar and untar the files using single line
Top Forums UNIX for Advanced & Expert Users tar and untar the files using single line Post 302520310 by bakunin on Friday 6th of May 2011 11:28:19 AM
Old 05-06-2011
Expanding on jim_mcnamara solution: you could use an intermediate file instead of a pipeline if you don't want to write the archived files immediately OR if you want to unarchive them to several places. Only in this case it makes sense to use compression because if you immediately restore the files to another place (regardless of this place being on the same system or not) it is easier to send the files uncompressed.

The pipeline in jim_mcnamaras code has - for the purpose of this thread - unlimited bandwidth, so it doesn't matter how much data you pipe through. It still does matter, though, to use one processore for compressing and another one for uncompressing the data.

The same is true for a network connection: network bandwidth is - in most instances, if not this would be a very rare exception - available in bigger quantities than processing time, therefore it is still cheaper to use

Code:
# tar -cf - /some/dir | ssh root@othermachine "cd /some/dir ; tar -xf -"

then to squeeze the stream through zip on one system and unzip on the other.

I case you still want to use compression:

Code:
archive and compress:
# (cd /some/dir ; tar -cf - . | gzip [-9] > /somewhere/file.tar.gz

uncompress and restore:
# gzip -cd /somewhere/file.tar.gz | (cd /some/dir; tar -xf - )

I hope this helps.

bakunin
 

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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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