r.ros(1grass) on Linux
The text 0df29198b462, as Debian 11 (Bullseye) shipped it.
Generates rate of spread raster maps. Generates three, or four raster map layers showing the base (perpendicular) rate of spread (ROS), the maximum (forward) ROS, the direction of the maximum ROS, and optionally the maximum potential spotting distance for fire spread simulation.