if [[ $# != 4 ]] 
then
   echo Usage: $0  FlowID  Destination  Interval-Size   TraceFile
   echo "  " FlowID is set by using \$tcp set fid ... in NS2
   echo "  " Destination depends on the order you create the Nodes in NS
   echo "  " Recommended interval size: 1 sec
   exit 1
fi

awk -f /home/cheung/teaching/web/558/Syllabus/Tools/tput.awk \
   flow=$1 flow_t=tcp hdr_size=0 dst=$2 delta=$3 $4