telnet(1) on OpenBSD
The text 59426bc9feb9, as OpenBSD 4.5, OpenBSD 4.4, OpenBSD 4.3, OpenBSD 4.2 shipped it.
user interface to the TELNET protocol
Flags it lists
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-4 -
-6 -
-8 -
-E -
-F -
-K -
-L -
-X -
-a -
-b -
-c -
-d -
-e -
-f -
-input -
-k -
-l -
-n -
-output -
-r -
-x