zerofill - clear unused disk space and blank devices.

zerofill was written by David Sugar <dyfet@gnutelephony.org>.

       Copyright © 2010-2014 David Sugar, Tycho Softworks.
       This  is  free  software;  see  the  source  for  copying conditions.  There is NO warranty; not even for
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

GNU uCommon                                       January 2010                                       zerofill(1)

       This  command  is  a  relative of nullfile.  Like nullfile, it can be used to write all unused disk space
       with '0', thereby making file systems that are stored on virtual machines easier to pack.   In  addition,
       zerofill  can  fill  unused  disk  space  with  random data before zeroing, which can be useful to remove
       forensic trace of deleted files.  Finally, zerofile can be told to operate on and zero  (erase)  complete
       disk devices.

       zerofill - clear unused disk space and blank devices.

--random=count
              Number of passes to use writing random data before wiping data.

       --help Outputs help screen for the user.

       Report bugs to bug-commoncpp@gnu.org or bugs@gnutelephony.org.

zerofill [options] [devices] ...