hashstats(8) on Linux
The text 4d739f8900a2, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it.
Print information about a duperemove hashfile
Flags it lists
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-a -
-b -
-l -
-n