BEGIN	{	# we need to know (usual) packet size to convert byte numbers	# to packet numbers	if (packetsize <= 0)		packetsize = 512	}$5 !~ /[SR]/	{	# print out per-packet data in the form:	#  <packet #>	#  <start sequence #>	#  <1st send time>	#  <last send time>	#  <1st ack time>	#  <last ack time>	#  <# sends>	#  <# acks>	n = split ($1,t,":")	tim = t[1]*3600 + t[2]*60 + t[3]	if ($6 != "ack") {		i = index($6,":")		strtSeq = substr($6,1,i-1)		id = 1.5 + (strtSeq - 1) / packetsize		id -= id % 1		if (maxId < id)			maxId = id		if (firstSend[id] == 0) {			firstSend[id] = tim			seqNo[id] = strtSeq		}		lastSend[id] = tim		timesSent[id]++		totalPackets++	} else {		id = 1 + ($7 - 2) / packetsize		id -= id % 1		timesAcked[id]++		if (firstAck[id] == 0)			firstAck[id] = tim		lastAck[id] = tim		totalAcks++	}	}END	{	print "# " maxId " chunks.  " totalPackets " packets sent.  " \		totalAcks " acks."	# for packets that were implicitly acked, make the ack time	# be the ack time of next explicitly acked packet.	for (i = maxId-1; i > 0; --i)		while (i > 0 && firstAck[i] == 0) {			lastAck[i] = firstAck[i] = firstAck[i+1]			--i		}	tzero = firstSend[1]	for (i = 1; i <= maxId; i++)		printf "%d\t%d\t%.2f\t%.2f\t%.2f\t%.2f\t%d\t%d\n",\			i, seqNo[i], \			firstSend[i] - tzero, lastSend[i] - tzero,\			firstAck[i] - tzero, lastAck[i] - tzero,\			timesSent[i], timesAcked[i]	}