Provided by: ssdeep_2.14.1+git20180629.57fcfff-1_amd64 bug

NAME

       ssdeep - Computes context triggered piecewise hashes (fuzzy hashes)

SYNOPSIS

       ssdeep [-m <file>] [-k <file>] [-vdprgsblcxa] [-t val] [FILES]
       ssdeep [-V|h]

DESCRIPTION

       Computes a signature based on context triggered piecewise hashes for each input file, also
       called a fuzzy hash.  If requested, the program matches those signatures against a file of
       known  signatures and reports any possible matches.  It can also examine one or more files
       of signatures and find any matches in those files.  Output is written to standard out  and
       errors to standard error.

       -m <file>
              Loads the specified file of known hashes to be used for matching. This file must be
              a previous output of the program. The program then hashes each entry in  FILES  and
              compares  these  signatures to the known signatures.  Any matches which score above
              the threshold are displayed.  This flag may be used multiple  times  to  load  more
              known signatures.  This flag may not be used with the -k or -x flags.

       -k <file>
              Load  the specified file of known hashes to be used for matching. This file must be
              a previous output of the program. The program then treats each entry in FILES as  a
              set  of  known  hashes as well. The hashes in these FILES are compared to the known
              hashes from this file. Matches which score above the threshold are displayed.  Both
              the file specified here and the input FILES should contain fuzzy hashes.  This flag
              may be used multiple times to load more known signatures.  This  flag  may  not  be
              used with the -m, -d, or -p flags.

       -v     Verbose  mode.  The  name  of each file is printed to standard error as it is being
              hashed.

       -d     Computes a signature for each entry in the FILES and compares  it  to  the  set  of
              known  signatures.  Matches  which  score  above  the  threshold are displayed. The
              computed signature is then added to the set of known signatures.  This flag may not
              be used with the -k or -x flags.

       -p     Works  like  the  -d flag, but displays all matches for each file. That is, for two
              files A and B which match score above the threshold, displays "A matches B" and  "B
              matches A".  This flag may not be used with the -k or -x flags.

       -r     Enables  recursive  mode.  All  subdirectories  are  traversed.   Please  note that
              recursive mode cannot be used to examine all files of a given file  extension.  For
              example,  invoking  the program with -r *.txt will examine all files in directories
              that end in .txt.  If you want to process all files in a directory  tree  with  the
              .txt suffix, try using the find(1) command.

       -g     Similar  files  are  grouped  together into clusters. This can be handy for finding
              more similar files. That is, if you are searching for  file  A,  which  matches  B,
              anything which matches B will also be included in the cluster.

       -s     Silent mode. All error messages are suppressed.

       -b     Enables  bare  mode.  Strips  any  leading  directory  information  from  displayed
              filenames.  This flag may not be used in conjunction with the -l flag.

       -l     Enables relative file paths. Instead of printing the absolute path for  each  file,
              displays the relative file path as indicated on the command line. This flag may not
              be used in conjunction with the -b flag.

       -c     Enables comma separated output mode. In any of the matching modes -d,  -p,  or  -m,
              displays the results as input file, known file, matching score.

       -x     Signature  file matching.  Each entry in FILES must contain signatures generated by
              a previous output of the program. Each signature is loaded and compared against the
              set of known hashes. Match scores above the threshold are displayed. Each signature
              is then added to the set of knowns.  This flag may not be used with the -m, -d,  or
              -p flags.

       -a     Displays  all  matches in any of the matching mode, regardless of score.  Using the
              -a flag displays all results, even if the match score is zero.

       -t <val>
              In any of the matching modes, only display matches when match score is greater than
              the given value. The default threshold value is zero.

       -h     Show a help screen and exit.

       -V     Show the version number and exit.

RETURN VALUE

       Returns  0  on  success,  1  if  there  is a problem.  Read errors, permission denied, and
       encountering directories while not in  recursive  mode  are  still  considered  successes.
       Problems  are things like being unable to load the matching file, specifying both bare and
       relative paths, etc.

AUTHOR

       ssdeep was written by Jesse Kornblum of Facebook,
       research@jessekornblum.com

COPYRIGHT

       Copyright (C) 2002 Andrew Tridgell
       Copyright (C) 2006, 2008, 2010 ManTech International Corporation
       Copyright (C) 2012 Kyrus
       Copyright (C) 2013 Helmut Grohne
       Copyright (C) 2013, 2014 Facebook
       Copyright (C) 2014 kikairoya
       Copyright (C) 2014 Jesse Kornblum
       Copyright (C) 2017 Tsukasa OI

       This program is licensed under the terms of the General  Public  License.   See  the  file
       COPYING for details.

SEE ALSO

       This program is based on SpamSum by Dr. Andrews Tridgell.
       http://www.samba.org/ftp/unpacked/junkcode/spamsum/