#!/bin/bash
#Name: network_top.sh
#Usage: sh network_top.sh --network-port=eth0 --interval-time=1 --repeat-total=10

usage()
{
cat <<EOF
Usage: $0 [OPTIONS]
  --network-port=ethN    Show which network port,For Example --network-port=eth0.
  --interval-time=N      Every twice that need interval time,For Example --interval-time=1.
  --repeat-total=N       We need to see a continuous flow of card number,For Example --repeat-total=10.
EOF
exit 1
}

if [ "$#" -lt 1 ] ; then
   usage
fi

for INPUT_DATA in $*
do
    INPUT_DATA_1=$1
    Val=`echo "$INPUT_DATA_1" | sed -e "s;--[^=]*=;;"`
   
    case "$INPUT_DATA_1" in 
       --network-port=*)
         ETH_PORT="$Val"
       ;;
       --interval-time=*)
         INTERVAL_TIME="$Val"
       ;;
       --repeat-total=*)
         REPEAT_TOTAL="$Val"
       ;;
       *)
       echo -e "\n ERROR VARIABLES: $INPUT_DATA_1 \n"
       usage 
       exit 1
       ;;
    esac
    shift
done

infirst=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$ETH_PORT'/{print $2}')
outfirst=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$ETH_PORT'/{print $10}')

echo "$ETH_PORT" "in_bytes/sec" "out_bytes/sec" "total_bytes/sec" |awk '{printf("%10s %16s %16s %16s\n",$1,$2,$3,$4)}'
sleep $INTERVAL_TIME"s"

i=0
while [ "$i" -lt "$REPEAT_TOTAL" ]
do
   inend=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$ETH_PORT'/{print $2}')
   outend=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$ETH_PORT'/{print $10}')
   sumin=$((($inend-$infirst)/$INTERVAL_TIME))
   sumout=$((($outend-$outfirst)/$INTERVAL_TIME))
   sum=$(($sumin+$sumout))

   echo "$ETH_PORT" $sumin $sumout $sum |awk '{printf("%10s %16s %16s %16s\n",$1,$2,$3,$4)}'
   infirst=$inend
   outfirst=$outend
   i=$(($i+1))
   sleep $INTERVAL_TIME"s"