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Full Discussion: Pipelining with tar
Top Forums UNIX for Dummies Questions & Answers Pipelining with tar Post 302460348 by huntreilly25 on Wednesday 6th of October 2010 01:54:44 PM
Old 10-06-2010
Pipelining with tar
Hello,
I am currently interning at a place and my job is to essentially learn UNIX. My supervisor gives me problems here and there to help guide me with my learning but for the most part I'm doing this all by self-teaching myself. Needless to say I have run into a few obstacles...for instance

-Create a *one* line command that, using tar, will collect the full /usr/local directory (you need to run this as root again) and copy the whole /usr/local structure under /opt
For example /usr/local/bin/hello will become /opt/local/bin/hello, etc.

I want this as follows:
1. /usr/local is collected by tar, but the output of this tar command is its stdout.
2. what you get from the previous stdout, you compress with gzip and send it to stdout again
3. get this output and decompress with gzip.
4. get this output and pipe to tar in a way that will extract the tree under /opt.

If anyone knows how I could go about doing this, please let me know, or at the very least point me in the right direction. What I've got so far (which could be completely wrong) is:

tar cvf - usr/local/ | gzip -c - | gunzip -c - | tar xvf -

in theory I feel like this should work (except for extracting the tree under /opt...i'm kinda stuck there) So if anyone knows or has a solution it would be greatly appreciated! and maybe help me out by explaining what is involve and maybe where I went wrong.

Thanks
 

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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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