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    The following form allows you to view linux man pages.

    Command:

    shred

    
    
    

    SYNOPSIS

           shred [OPTION]... FILE...
    
    
    

    DESCRIPTION

           Overwrite the specified FILE(s) repeatedly, in order to make it  harder
           for even very expensive hardware probing to recover the data.
    
           Mandatory  arguments  to  long  options are mandatory for short options
           too.
    
           -f, --force
                  change permissions to allow writing if necessary
    
           -n, --iterations=N
                  overwrite N times instead of the default (3)
    
           --random-source=FILE
                  get random bytes from FILE
    
           -s, --size=N
                  shred this many bytes (suffixes like K, M, G accepted)
    
           -u, --remove
                  truncate and remove file after overwriting
    
           -v, --verbose
                  show progress
    
           -x, --exact
                  do not round file sizes up to the next full block;
    
                  this is the default for non-regular files
    
           -z, --zero
                  add a final overwrite with zeros to hide shredding
    
           --help display this help and exit
    
           --version
                  output version information and exit
    
           If FILE is -, shred standard output.
    
           Delete FILE(s) if --remove (-u) is specified.  The default  is  not  to
           remove  the  files because it is common to operate on device files like
           /dev/hda, and those files usually should not be removed.  When  operat-
           ing on regular files, most people use the --remove option.
    
           CAUTION:  Note  that  shred relies on a very important assumption: that
           the file system overwrites data in place.  This is the traditional  way
           to  do  things, but many modern file system designs do not satisfy this
           assumption.  The following are examples of file systems on which  shred
    
           * compressed file systems
    
           In the case of ext3 file systems, the  above  disclaimer  applies  (and
           shred  is  thus  of  limited  effectiveness) only in data=journal mode,
           which journals file data in addition to just  metadata.   In  both  the
           data=ordered  (default) and data=writeback modes, shred works as usual.
           Ext3 journaling modes can  be  changed  by  adding  the  data=something
           option  to  the  mount  options  for  a  particular  file system in the
           /etc/fstab file, as documented in the mount man page (man mount).
    
           In addition, file system backups and remote mirrors may contain  copies
           of the file that cannot be removed, and that will allow a shredded file
           to be recovered later.
    
    
    

    AUTHOR

           Written by Colin Plumb.
    
    
    

    REPORTING BUGS

           Report shred bugs to bug-coreutils@gnu.org
           GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
           General help using GNU software: <http://www.gnu.org/gethelp/>
           Report shred translation bugs to <http://translationproject.org/team/>
    
    
    

    COPYRIGHT

           Copyright (C) 2010 Free Software Foundation, Inc.   License  GPLv3+:  GNU
           GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
           This  is  free  software:  you  are free to change and redistribute it.
           There is NO WARRANTY, to the extent permitted by law.
    
    
    

    SEE ALSO

           The full documentation for shred is maintained as a Texinfo manual.  If
           the  info  and  shred programs are properly installed at your site, the
           command
    
                  info coreutils 'shred invocation'
    
           should give you access to the complete manual.
    
    
    

    GNU coreutils 8.4 November 2015 SHRED(1)

    
    
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