duperemove - 0.11.2-3+b2 main

Duperemove is a tool for finding duplicated extents and submitting them for
deduplication. When given a list of files it will hash their contents on a
block by block basis and compare those hashes to each other, finding and
categorizing extents that match each other.
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On BTRFS and, experimentally, XFS, it can then reflink such extents in a
race-free way. Unlike hardlink-based solutions, affected files appear
independent in any way other than reduced disk space used.