14

I am new to the world of Linux and seem to have run into a stumbling block. I know I can extract a specifc archive using the command tar xvfz archivename.tar.gz sampledir/ however how can I extract sampledir/ to testdir/ rather than the path that the archive is in e.g.currently the archive is in the path /tmp/archivename.tar.gz and I would like to extract sampledir to testdir which is in the path /tmp/testdir.

19

What you're looking for is the -C option:

$ man tar
<snip>

-C, --directory DIR
       change to directory DIR

Usage, per your example:

$ tar xvzf archivename.tar.gz -C /tmp/testdir/ sampledir/

Also, you may be interested to know that modern versions of tar don't require the z flag to decompress gzipped files; they'll notice it's a .gz and Do The Right Thing automatically.

2
  • Thanks. Funnily I did try that before posting the question and it failed. Maybe I missed an option. I'll try it again. Jul 13 '11 at 0:57
  • Brilliance. I always forget about this for large archives.
    – zmonteca
    Jun 11 '13 at 6:07
3

You don't need to play crazy games with untarring everything. Tar fully supports only extracting a subset of the files in an archive, as shown in the following (trivial) example:

/tmp $ mkdir tarsrc
/tmp $ cd tarsrc
/tmp/tarsrc $ mkdir a b
/tmp/tarsrc $ touch a/aaa b/bbb
/tmp/tarsrc $ tar cf ../tartest.tar .
/tmp/tarsrc $ cd ..
/tmp $ mkdir tardest
/tmp $ cd tardest
/tmp/tardest $ tar xf ../tartest.tar ./a    
/tmp/tardest $ ls -R
.:
a/

./a:
aaa

The trick is that the pathspec must match the contents of the tarfile exactly. So when you do a tar tf, if the path starts with ./, you've got to put that in, and if it doesn't have it, you have to leave it out. Also, if you want to extract a sub-sub-sub-sub-sub-sub-sub-path, it'll end up N levels deep in the filesystem when you're done.

2
  • Thanks womble. Maybe it isn't the right example to use but I am comparing tar to Winzip, WinRAR, etc and possibly tar is the incorrect command to use however seeing that I have seen example of tar unarchiving gzip and bzip files, I was hoping I could apply similar process e.g. select the file you like to unarchive (tar does this) and select the path you would like to extract to (tar does not do this unless I am in the specific directory). Jul 12 '11 at 23:45
  • You want the -C option to tar, then.
    – womble
    Jul 13 '11 at 0:01

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