ttylinkd(8) on Linux
The text 68cf15a14212, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
TTYlink daemon for AX.25, NET/ROM, ROSE and IP.
Flags it lists
-
-c -
-f -
-h -
-v