gammastep(1) on Linux
The text 36d9fd80e427, as Debian 11 (Bullseye) shipped it.
set color temperature of display according to time of day
Flags it lists
-
-O -
-P -
-V -
-b -
-c -
-g -
-h -
-l -
-m -
-o -
-p -
-r -
-t -
-v -
-x