#!/bin/bash
#监测网卡流量
 

if [ -n "$1" ]; then 
eth_name=$1 
else 
eth_name="eth0" 
fi 
i=0 
send_o=`ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'` 
recv_o=`ifconfig $eth_name | grep bytes | awk '{print $2}' | awk -F : '{print $2}'` 
send_n=$send_o 
recv_n=$recv_o 
while [ $i -le 100000 ]; do 
send_l=$send_n 
recv_l=$recv_n 
sleep 1 
send_n=`ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'` 
recv_n=`ifconfig $eth_name | grep bytes | awk '{print $2}' | awk -F : '{print $2}'` 
i=`expr $i + 1` 
send_r=`expr $send_n - $send_l` 
recv_r=`expr $recv_n - $recv_l` 
total_r=`expr $send_r + $recv_r` 
send_ra=`expr \( $send_n - $send_o \) / $i` 
recv_ra=`expr \( $recv_n - $recv_o \) / $i` 
total_ra=`expr $send_ra + $recv_ra` 
sendn=`ifconfig $eth_name | grep bytes | awk -F \( '{print $3}' | awk -F \) '{print $1}'` 
recvn=`ifconfig $eth_name | grep bytes | awk -F \( '{print $2}' | awk -F \) '{print $1}'` 
clear 
echo "Last second : Send rate: $send_r Bytes/sec Recv rate: $recv_r Bytes/sec Total rate: $total_r Bytes/sec" 
echo "Average value: Send rate: $send_ra Bytes/sec Recv rate: $recv_ra Bytes/sec Total rate: $total_ra Bytes/sec" 
echo "Total traffic after startup: Send traffic: $sendn Recv traffic: $recvn" 
done