实用的网络流量监控脚本

#!/bin/bash  
if [ -n "$1" ]; then  
    eth_name=$1  
else  
    eth_name="eth0" 
fi  
i=0 
send_o=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'`  
recv_o=`/sbin/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=`/sbin/ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'`  
recv_n=`/sbin/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=`/sbin/ifconfig $eth_name | grep bytes | awk -F \( '{print $3}' | awk -F \) '{print $1}'`  
recvn=`/sbin/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

直接./net.sh运行的话默认是网卡eth0, 如果需要看其它的网卡运行./net.sh eth1
运行结果如下图所示：