do a man on fuser...

fuser will identify processes that have a file or directory in use... fuser is esp helpful when you are trying to find a process that has a file open...

This helps many times when /tmp is reporting 100% and there are no large files in /tmp... I have seen oracle do this several times... and it only clears the space when the process is identified and summarily killed...

also, useful when you need to umount a directory for some disk maintenance...

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