Index your file system so that you can find duplicates.
For now, only works on Unix systems.
You need OCaml and obuild.
obuild configure
obuild buildCopy or symbolically link the binary in your ~/bin directory.
If you want bash completion, run fsindex --bashcompletion and follow the instructions.
Run fsindex --help.
Additionally, you can prevent files/directories from being added to the index by creating a file having the same name as your index file plus .excl. E.g. if your index is ~/myindex, create a file ~/myindex.excl containing
/dev
/proc
/run
/sys
/tmp