srm source

srm(1)                                                                    srm(1)



NAME
       srm - securely remove files or directories

SYNOPSIS
       srm [OPTION]... FILE...

DESCRIPTION
       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 35 passes to overwrite the  file's  contents.   If  this
       seems  overkill  you  can  use  use the --dod, --doe, --openbsd, --simple
       option which use less passes.  If you specify more than  one  option  (of
       those listed above) they are executed in the order shown above.

       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
       or
              rm ./-f

OPTIONS
       -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
              only overwrite the file with a single pass of zero bytes

       -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
              http://cio.energy.gov/CS-11_Clearing_and_Media_Sanitization_Guidance.pdf
              for details.

       -G, --gutmann
              Use  the  35-pass Gutmann method.  This is the default and slowest
              overwrite mode.   See  http://en.wikipedia.org/wiki/Gutmann_method
              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

SIGNALS
       SIGINFO, SIGUSR2
              show current write position and filename handled.

ENTIRE HARD DISKS
       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 https://ata.wiki.kernel.org/index.php/ATA_Secure_Erase

NOTES
       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
       https://sourceforge.net/projects/srm/  which  is  also   accessible   via
       http://srm.sourceforge.net/.                                          See
       http://en.wikipedia.org/wiki/Data_remanence  for  a  general   discussion
       about overwriting data.

SEE ALSO
       rm(1)  http://www.gnu.org/software/coreutils/manual/coreutils.html#rm-invocation

       shred(1)
              http://www.gnu.org/software/coreutils/manual/coreutils.html#shred-invocation

       wipe(1)
              http://lambda-diode.com/software/wipe

       secure-delete
              http://packages.debian.org/lenny/secure-delete

       scrub(1)
              http://code.google.com/p/diskscrub/



Matt Gauthier, Dirk Jagdmann         1.2.13                               srm(1)

Locations of this man page

SystemPackageVersionNameFilename
Arch Linuxcommunity/srm1.2.13-1srm.1/usr/share/man/man1/srm.1.gz