Find duplicate files in one or more directories and optionally prune the duplicates.
From the help:
Each directory specified on the command line will be be scanned for duplicates.
Available options:
-? The same as the "-help" option.
-d The same as the "-delete" option.
-delete Delete all duplicates found.
-extension=EXTENSION Limit processing to just files with the specified
extension. May be specified more than once.
-h The same as the "-help" option.
-help Displays a description of each option.
-hidden Process files and directories that start with a dot
(.). These 'hidden' files are ignored by default.
-v The same as the "-version" option.
-version Displays the program version information.