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        scrub - Disk scrubbing program
        
        
        - Description:
- Scrub writes patterns on files or disk devices to make
retrieving the data more difficult.  It operates in one of three
modes: 1) the special file corresponding to an entire disk is scrubbed
and all data on it is destroyed;  2) a regular file is scrubbed and
only the data in the file (and optionally its name in the directory
entry) is destroyed; or 3) a regular file is created, expanded until
the file system is full, then scrubbed as in 2). 
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