tcpsvd(8) on Linux
The text 2238e0c4aae6, as Debian 4.0 (Etch) shipped it.
TCP/IP service daemon
Flags it lists
-
-C -
-E -
-b -
-c -
-h -
-i -
-l -
-p -
-t -
-u -
-v -
-vv -
-x