linux查看端口流量的脚本Linux认证考试
文章作者 100test 发表时间 2009:12:19 11:05:40
来源 100Test.Com百考试题网
通过本脚本,发现bash确实在算术运算方面比老的shell要强大,为此需要开始学习bash,以利用它强大的功能。不过bash中的for语句功能和c中差异比较大。
# cat stream
#! /bin/bash
# Write by Neil.xu qq:37391319 email: [email protected]
# 2008-8-19 we need to monitor streams of LTS channels, so write this script
typeset in in_old dif_in dif_in1 dif_out1
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 ))