topic Re: Question about tar in Operating System - Linux

Question about tar

R.O. — Thu, 25 Sep 2003 08:39:02 GMT

Hi,

IÂ´m doing a tar of the full system:

tar cvf /dev/st0 /

When I want to restore a single file in a directory different of the original, i.e:

cd /tmp
tar xvf /dev/st0 home/user1/myfile.txt

I have the file with the full path : /tmp/home/user1/myfile.txt

How can I restore the file directly in /tmp?

Th

Re: Question about tar

John Waller — Thu, 25 Sep 2003 09:22:01 GMT

Sorry, in this case you can not do this. Because you created the tar by specifying / all files will restore under /. You can see this with tar tvf /dev/st0. To fix, change your command to create the tar so it performs tar cvf /dev/st0 ./ (make sure you do a cd / before you start), so when you extract a file it will recover relative to your pwd.

Re: Question about tar

Vitaly Karasik_1 — Thu, 25 Sep 2003 09:23:41 GMT

I afraid you can't do this

Vitaly

Re: Question about tar

Stuart Browne — Thu, 25 Sep 2003 19:37:17 GMT

That's very odd.

Most versions of GNU's tar automatically strip the leading /, realising that it's a bad idea, and requires the '-P' switch (--absolute-paths) in order to forcibly save it.

Care to tell us what version of tar you are using ? (tar --version)

In any case, the quick solutions are these:

- use a chroot environment to restore it.
- change the backup routine to 'cd /;tar cvf /dev/st0 .' instead.

Hope this helps.

Re: Question about tar

Virgil Chereches_2 — Mon, 29 Sep 2003 05:55:12 GMT

If you have gnu tar you can use -C option to put the file in a different directory (you change only the root directory, the directory structure will be recreated in the new directory instead of /).
You can also use pax (man pax) which is a very powerfull archive reader (read tar and cpio archives).
I hope that's help,
Virgil

Re: Question about tar

Virgil Chereches_2 — Mon, 29 Sep 2003 05:57:44 GMT

Sorry for the last post.
I didn't get very well the question.
Use option "-s" at pax! It would do the trick.
Virgil.