Open Source C Duplicate File Finders

The littleutils include duplicate file finders (repeats, repeats.pl, repeats.py), image optimizers (opt-jpg, opt-png, opt-gif, recomp-jpg), file rename tools (lowercase, uppercase, pren), archive recompressors (to-gzip, to-bzip2, to-bzip3, to-7zip, to-lzma, to-lzip, to-xz), a tempfile utility (tempname), file property tools (filedate, filemode, filenode, fileown, filesize, and lrealpath), and others. See the README file for more details.

It compares files and folders, even inside compressed archives. When done, you can send the duplicate files or folders to the recycle bin, another folder or erase them, or save the list to work later.

Searches a drive (possibly with additional mounted drives) for duplicate files, outputs a potential script for deleting them after editing.

When you've been using your computer for quite a long time, often you end up duplicating your files and you don't even know about them. Duplicate File Finder is a Linux/Unix utility than scans your hard drive for finding duplicates of a given file.