thinkfan(1) on Linux
The text c0667c6b4606, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A simple fan control program
Flags it lists
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-D -
-b -
-c -
-d -
-h -
-n -
-p -
-q -
-s -
-z