Finddupe is a VERY FAST command line C program to catalog very large archives, identifying duplicate files even when offline. It has many features. You can easily grep a catalog to find what you have, and locate where it is.
License
GNU General Public License version 2.0 (GPLv2)Follow finddupe - catalog files and find dups
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this only makes hard links to the duplicates. It offers _no_ way to delete the files, or move them to another directory.