nc(1) on macOS
The text 6dae0b89065d, as OS X 10.11.1, OS X 10.11 shipped it.
arbitrary TCP and UDP connections and listens
Flags it lists
-
--apple-delegate-pid -
--apple-delegate-uuid -
--apple-ext-bk-idle -
--nowakefromsleep -
-4 -
-6 -
-A -
-C -
-D -
-G -
-H -
-I -
-J -
-L -
-U -
-X -
-b -
-c -
-d -
-h -
-i -
-k -
-l -
-n -
-p -
-r -
-s -
-t -
-u -
-v -
-w -
-z