linux下监视网卡流量的一段脚本

linux下监视网卡流量的一段脚本：

 

 

#! /bin/bash

# 2008-8-19 we need to monitor streams of LTS channels, so write this script

 

typeset out out_old dif_out

in_old=$(cat /proc/net/dev | grep eth0 | sed 's=^.*:==' | awk '{ print $1 }' )

out_old=$(cat /proc/net/dev | grep eth0 | sed 's=^.*:==' | awk '{ print $9 }')

while true

 

do

 

sleep 1

 

in=$(cat /proc/net/dev | grep eth0 | sed 's=^.*:==' | awk '{ print $1 }')

out=$(cat /proc/net/dev | grep eth0 | sed 's=^.*:==' | awk '{ print $9 }')

dif_in=$((in-in_old))

dif_in1=$((dif_in * 8 / 1024 / 1024 ))

dif_out=$((out-out_old))

echo " IN: ${dif_in} bytes OUT: ${dif_out} bytes

dif_out1=$((dif_out * 8 / 1024 / 1024 ))

echo "IN: ${dif_in1} mbps OUT: ${dif_out1} mbps

in_old=${in}

out_old=${out}

done