Usage:
rpc.nfsd [-d|--debug] [-H hostname] [-p|-P|--port port]
   [-N|--no-nfs-version version] [-V|--nfs-version version]
   [-s|--syslog] [-t|--tcp] [-T|--no-tcp] [-u|--udp] [-U|--no-udp]
   [-r|--rdma=] [-G|--grace-time secs] [-L|--leasetime secs] nrservs