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A question on tar using -C

Posted on 2004-08-13
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Last Modified: 2010-04-20
What does this do "tar c -C /usr include -C /etc ."
I am not able to execute that successfully.
It will tar files from /usr/include and /etc and put it in the current directory?

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Question by:gopikrish
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Gns earned 80 total points
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It'll create a tar archive at the default tape device (see below) by first changing directory to /usr, getting all files from includ and downward, then change directory to /etc and getting everything from the current directory ... (which happen to be /etc).

Your error is likely that the default device /dev/rmt0 is non-existant on your system;-).
Now, this default device is actually decided during compilation (at least for GNU tar), so ... since most systems _don't_ have an rmt0 device, many distrios have this set to something else... You can see what by looking at the defenition of ARCHIVE in the output from
tar --help
... might default to "-f- -b20" whcih basically would just spew the complete archive onto stanrad output (ie the screen).
Remedy would be to use the -f flag to specify a file/location for the archive.

-- Glenn
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