//usage: "[-cb] [-p MIN_PORT] [-P MAX_PORT] [-t TIMEOUT] [-T MIN_RTT] HOST"
//usage:#define pscan_full_usage "\n\n"
//usage: "Scan a host, print all open ports\n"
-//usage: "\nOptions:"
//usage: "\n -c Show closed ports too"
//usage: "\n -b Show blocked ports too"
//usage: "\n -p Scan from this port (default 1)"