freedup

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freedup is a program to scan directories or file lists for duplicate files. The file lists may be provided to a input pipe or internally generated using find with provided options. There are more options to specify the search conditions more datailed. Other options influence the performed actions, i.e. whether to display only or to specify what kind of link under which circumstances. freedup first compares file sizes, then the MD5 signatures, and before taking actions a byte-by-byte check for verification is performed. An interactive mode allows to decide individually which files to link soft or hard or to delete.

fdupes is written in POSIX compliant C and is released under the GNU Public License.

[edit] Similar programs

Other programs that can find duplicates and run under *nix:

clink
duff
dupseek
dupefinder
duper
dupmerge
epac
fdf - Perl/c based and runs across platforms (Win32, *nix and possibly others)
fdupe
fdupes
freedup - POSIX C compliant and runs across platforms (Windows with Cygwin, Linux, AIX, etc)
freedups
fslint
ftwin
rdfind
dupmerge - runs across platforms (Win32/64 with Cygwin, *nix, Linux etc.)