http://pypi.python.org/pypi/dupfilefind

usage: dupfilefind [-h] [-v] [-I IGNORE_DIRS] [-H] [-D] [-m m] [-M M] [-p]
                   [--include-names-in-profiles] [-n]
                   [dir [dir ...]]

Find files with identical contents.

positional arguments:
  dir                   directories to recursively examine (default '.')

optional arguments:
  -h, --help            show this help message and exit

  -v, --verbose         Emit more information.

  -I IGNORE_DIRS, --ignore-dirs IGNORE_DIRS
                        comma-separated list of directories to skip (if you
                        need to name a directory which has a comma in its name
                        then escape that name twice) (this does what you would
                        expect with relative vs. absolute paths) (default _dar
                        cs,.svn,.git,.bzr,/proc,/sys,/dev,/tmp,/var/tmp,/lib64
                        /udev
  -H, --hard-link-them  Whenever a file is found with identical contents to a
                        previously discovered file, replace the new one with a
                        hard link to the old one. This option is very
                        dangerous because hard links are confusing and
                        dangerous things to have around.
  -D, --delete-them     Whenever a file is found with identical contents to a
                        previously discovered file, delete the new one. This
                        option is dangerous.
  -m m, --min-size m    Ignore files smaller than this (default 1024).
  -M M, --max-size M    Hash only the first this many bytes of the file
                        (default 8589934592).
  -p, --profiles        Print out the md5sum and size in bytes of every file.
                        This could be useful for a p2p storage project to
                        measure how valuable convergent encryption is.
  --include-names-in-profiles
                        Print out the file name in addition to the other
                        information from --profiles, for each file.
  -n, --no-follow-symlinks
                        Do not follow symlinks.
== Starting Points ==

 * TracGuide --  Built-in Documentation
 * [http://trac.edgewall.org/ The Trac project] -- Trac Open Source Project
 * [http://trac.edgewall.org/wiki/TracFaq Trac FAQ] -- Frequently Asked Questions
 * TracSupport --  Trac Support

For a complete list of local wiki pages, see TitleIndex.