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Date: Fri, 9 Sep 2005 10:59:56 +0200
From: Gareth Bailey <gjbailey@gmail.com>
To: freebsd-questions <freebsd-questions@freebsd.org>
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Subject: tar -u adds all files regardless of mod date
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Hi there,

I have a directory I want to backup at /usr/dir_a/dir_b.
I want to back the content of this dir to /usr/backups/dir_b
so I tried the following:

# cd /usr/backups/dir_b
# tar -cf dir_b.tar /usr/dir_a/dir_b

Now I have dir_b.tar which is 65MB in size.
If i then try to update modified files by doing this:

# tar -uf dir_b.tar /usr/dir_a/dir_b

and I end up with dir_b.tar being 130MB (double size) which
should not be the case since no files have been modified in
 /usr/dir_a/dir_b.

I do not get this problem if I do the same in the /usr/dir_a
directory. In the /usr/dir_a dir the tar file remains the same
size.

I would much appreciate some input!

Thanks,
Gareth