grotty(1) on Linux
The text cb4e7bd5ea99, as Debian 11 (Bullseye) shipped it.
groff driver for typewriter-like devices
Flags it lists
-
-B -
-F -
-U -
-b -
-c -
-d -
-f -
-h -
-i -
-o -
-r -
-u -
-v