nc(1) on OpenBSD
The text 3aad992817f8, as OpenBSD 2.5, OpenBSD 2.4 shipped it.
arbitrary TCP and UDP connections and listens
Flags it lists
-
-G -
-e -
-g -
-i -
-l -
-n -
-o -
-p -
-r -
-s -
-t -
-u -
-v -
-w -
-z