dupd is described as 'file duplicate detection CLI utility. The build currently supports Linux (tested on Debian), Solaris (tested on OpenIndiana), OpenBSD and Mac OS X. Other UNIX variants should work with minimal effort' and is an app in the File Management category. There are four alternatives to dupd for Linux, Mac, Windows and BSD. The best alternative is fdupes, which is both free and Open Source. Other great apps like dupd are Rdfind (Free, Open Source), jdupes (Free, Open Source) and Duff (Free, Open Source).