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

usage: dupfilefind [-h] [-v] [-I IGNORE_DIRS] [-H] [-D] [-m M] [-p]
                   [dir [dir ...]]

Find files with identical contents.

positional arguments:
  dir                   a directory to recursively examine

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 command twice) (default _darcs,.svn
  -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).
  -p, --profiles        Generate a profile of your files which doesn't contain
                        very much potentially-sensitive information (it
                        contains only the file sizes rounded up to 4096 bytes,
                        how many files were duplicates, and an 16-bit checksum
                        of each file). This could be useful for a p2p storage
                        project to measure how valuable convergent encryption
                        is.
== 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.