mDiff(1) on Linux
The text 3b5a1d7a55b4, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it. The page shows this text now.
Calculates the difference between a pair of overlapping images
Flags it lists
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-d -
-n -
-s -
-z