srm(1)                                                                  srm(1)

       srm - securely remove files or directories

       srm [OPTION]... FILE...

       srm removes each specified file by overwriting, renaming, and
       truncating it before unlinking.  This prevents other people from
       undeleting or recovering any information about the file from the
       command line.  By default srm uses the simple mode to overwrite the
       file's contents.  You can choose a different overwrite mode with --dod,
       --doe, --openbsd, --rcmp, --gutmann.  If you specify more than one mode
       option, the last option is used.

       You can use srm to overwrite block devices.  The device node is not
       removed after overwriting.  This feature is available on Linux.  Files
       with multiple hard links will be unlinked but not overwritten.

       srm, like every program that uses the getopt function to parse its
       arguments, lets you use the -- option to indicate that all following
       arguments are non-options.  To remove a file called `-f' in the current
       directory, you could type either
              rm -- -f
              rm ./-f

       -d, --directory
              ignored (for compatibility with rm(1))

       -f, --force
              ignore nonexistent files, never prompt

       -i, --interactive
              prompt before any removal

       -r, -R, --recursive
              remove the contents of directories recursively

       -x, --one-file-system
              when removing a hierarchy recursively, skip any directory that
              is on a file system different from that of the corresponding
              command line argument.  (Not supported on Windows)

       -s, --simple
              Overwrite the file with a single pass of 0x00 bytes.  This is
              the default mode.

       -P, --openbsd
              OpenBSD compatible rm.  Files are overwritten three times, first
              with the byte 0xFF, then 0x00, and then 0xFF again, before they
              are deleted.

       -D, --dod
              US Dod compliant 7-pass overwrite.

       -E, --doe
              US DoE compliant 3-pass overwrite.  Twice with a random pattern,
              finally with the bytes "DoE".  See
              for details.

       -G, --gutmann
              Use the 35-pass Gutmann method.  See
     for details.

       -C, --rcmp
              Royal Canadian Mounted Police compliant 3-pass overwrite.  First
              pass writes 0x00 bytes.  Second pass writes 0xFF bytes.  Third
              pass writes "RCMP".  See https://www.cse-
     for details.

       -v, --verbose
              explain what is being done.  Specify this option multiple times
              to increase verbosity.

       -h, --help
              display this help and exit.

       -V, --version
              output version information and exit.

              show current write position and filename handled.

       srm can write to block devices on Linux.  You can use srm to securely
       delete an entire hard disk, however you should only do this for classic
       magnetic drives.  The modern solid state disks (SSD) have a faster and
       better way to erase all contents, Secure Erase.  For a Linux operating
       system see

       srm can not remove write protected files owned by another user,
       regardless of the permissions on the directory containing the file.

       Development and discussion of srm is carried out at which is also accessible via  See for a general discussion
       about overwriting data.






Matt Gauthier, Dirk Jagdmann        1.2.15                              srm(1)