08-22-2001
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Join Date: Jul 2001
Last Activity: 16 June 2011, 4:50 PM EDT
Location: Portland, OR, USA
Posts: 1,626
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If you have any remotely mounted filesystems (NFS, etc...) that are mounted OVER data in a directory, df -k will show the space as used, but it will be hard to account for unless you umount them and look for the "hidden" files.
A good tip from Unix Hints and Hacks - good sysadmin reference book.