telnet.netkit(1) on Linux
The text b5780778d878, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
user interface to the TELNET protocol
Flags it lists
-
-4 -
-6 -
-8 -
-E -
-L -
-S -
-a -
-b -
-d -
-e -
-input -
-l -
-n -
-output -
-r