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du and tar: --exclude-from option

From: Jacob Elder
Subject: du and tar: --exclude-from option
Date: Sat, 28 Sep 2002 18:13:11 -0400
User-agent: Mutt/1.4i

It appears that du and tar use a different pattern language for their
--exclude-from option. I was trying to predict the size of a backup that
would be performed with tar, and came across a discrepency.

df reports that I'm using 2882M.
tar --exclude-from says that the backup is 2722M.
du with my tar-friendly exclude from reports that I'm using 2942M.
du without any exclude file reports that I'm using exactly: 2942M.

The options have the same name, and both commands hail from gnu.org, so
shouldn't they cooperate?

Linux 2.4.18, ext3, Debian Unstable, fileutils 4.1, tar 1.13.25. My exclude
file is attached.

Jacob Elder

Attachment: exclude
Description: Text document

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