telnet-ssl(1) on Linux
The text 944c9a0475f5, as Debian 3.1 (Sarge) shipped it.
user interface to the TELNET protocol
Flags it lists
-
-4 -
-6 -
-8 -
-E -
-K -
-L -
-S -
-X -
-a -
-b -
-d -
-e -
-l -
-n -
-r -
-z