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usage: ping [-AaDdfnoQqRrv] [-b boundif] [-c count] [-G sweepmaxsize] [-g sweepminsize]
[-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]
[-p pattern] [-S src_addr] [-s packetsize] [-t timeout]
[-W waittime] [-z tos] host
ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]
[-M mask | time] [-m ttl] [-p pattern] [-S src_addr]
[-s packetsize] [-T ttl] [-t timeout] [-W waittime]
[-z tos] mcast-group