jdupes
A powerful duplicate file finder and an enhanced fork of fdupes.
TLDR
Search a single directory
$ jdupes [path/to/directory]
Search multiple directories
$ jdupes [directory1] [directory2]
Search all directories recursively
$ jdupes --recurse [path/to/directory]
Search directory recursively and let user choose files to preserve
$ jdupes --delete --recurse [path/to/directory]
Search multiple directories and follow subdirectores under directory2, not directory1
$ jdupes [directory1] --recurse: [directory2]
Search multiple directories and keep the directory order in result
$ jdupes -O [directory1] [directory2] [directory3]