rmlint finds space waste and other broken things on your filesystem and offers to remove it.
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Features:

Finds…

…Duplicate Files and duplicate directories.
…Nonstripped binaries (i.e. binaries with debug symbols)
…Broken symbolic links.
…Empty files and directories.
…Files with broken user or/and group ID.

Differences to other duplicate finders:

Extremely fast (no exaggeration, we promise!)
Paranoia mode for those who do not trust hashsums.
Many output formats.
No interactivity.
Search for files only newer than a certain mtime.
Many ways to handle duplicates.
Caching and replaying.
BTRFS support.
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