Usage: dhcpd [-p <UDP port #>] [-f] [-d] [-q] [-t|-T]
             [-4|-6] [-4o6 <port>]
             [-cf config-file] [-lf lease-file]
             [-user user] [-group group] [-chroot dir]
             [-tf trace-output-file]
             [-play trace-input-file]
             [-pf pid-file] [--no-pid] [-s server]
             [if0 [...ifN]]
       dhcpd {--version|--help|-h}