How do you unarchive with TAR?

[Thomas J. Snively]

Recently, I've been getting in to getting cool things for free off the
netnews by downloading things and such.  I've had mild success, but I'm
stuck on this tar thing.

Ok, suppose I have a file, foo.foo.tar, ok?  The directions that the
poster says is "Tar this into your favorite directory...."
I can't unarchive anything.  I've read the manual on it several times,
and can't understand it.
If I'm in my home directory, and want to unarchive that whole thing into,
say, /stuff, what do I do?

Please send e-mail.  Thank you very much.

-Tom
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