[CentOS] tar with pipe

Joshua Baker-LePain jlb17 at duke.edu
Sun Sep 25 16:00:23 UTC 2005

On Sun, 25 Sep 2005 at 5:56pm, Kai wrote

> CentOS 4.1 X86_64
> I am trying to collect all my music files and extract them into a new 
> directory flat, (without the hierarchy)
> The command works find without the pipe, but do not work with.
> 1.Why don't the command work after the pipe?
> 2.How do I remove the hierarchy before extracting?
> $ tar -cvf music.tar `find ../ -name '*.mp3' -o -name '*.ogg'` | tar -xvf 
> music.tar

Pipes direct the next command to read from stdin, but the '-f' flag to 
'tar c' send its output to the named file, not stdout.  A better form of 
the above command would be:

tar cvO `find ../ -name '*.mp3' -o -name '*.ogg'` | tar xf -

The 'O' in the first tar sends its output to stdout, and the 'f -' in the 
2nd tells tar to read from stdin.

*However*, that will keep the directory structure.  Why not just use cp?

find ../ -name '*.mp3' -o -name '*.ogg' -print0 | xargs -0 -i cp \{} .

Joshua Baker-LePain
Department of Biomedical Engineering
Duke University

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