direwolf(1) on Linux
The text 5f4c57d04f9a, as Debian 10 (Buster) shipped it.
Soundcard TNC for packet radio.
Flags it lists
-
-B -
-D -
-S -
-U -
-a -
-b -
-c -
-d -
-l -
-n -
-p -
-q -
-r -
-t -
-x