rudups is an application for OS X used to find duplicate files. The files are compared using a md5 hash of their content. This application was written to learn RubyCocoa, so don’t expect much.
You can accomplish the same with find [dir1 [dir2 […]]] -type f -exec md5sum ‘{}’ ; | sort | uniq -w 32 -D . Although the -w and -D options passed to uniq are not valid on OS X (tested on 10.5) but recognized on Linux (tested on Debian).
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OS X 10.5+
You can download the latest rudups.dmg file from rubyforge.
Copyright 2009 Luis Parravicini. rudups is released under the GPL v2 license.