nsca(1) on Linux
The text 777bfbd9c0cf, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
Nagios Service Check Acceptor
Flags it lists
-
--daemon -
--inetd -
--single -
-f