Doublekiller is not available for Linux but there are a few alternatives that runs on Linux with similar functionality. The best Linux alternative is FSlint, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Doublekiller and four of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Doublekiller are Speedy Duplicate Finder, rmlint and Duplicate Files Finder.
FSlint is a utility to find and clean various forms of lint on a filesystem. I.E. unwanted or problematic cruft in your files or file names. For example, one form of lint it finds is duplicate files. It has both GUI and command line modes.
A commandline tool to find unnecessary files (duplicates, tmpfiles, unstripped binaries and more)
Duplicate Files Finder is an application which searches for duplicate files (files which have the same content, but not necessarily the same name) and lets the user remove duplicate files, either by deleting them or by creating links.
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