linux查看端口流量的脚本

通过本脚本,创造bash确凿 在算术运算方面比老的shell要强大,为此需要 起头学习bash,以利用 它强大的功效 。不过bash中的for语句功效 和c中区别对比 大。

  # cat stream

  #! /bin/bash

  # Write by Neil.xu  qq:37391319 email:

  # 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 ))

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

  in_old=${in}

  out_old=${out}

  done

  运行效果 :

  # ./stream

  IN: 349179 bytes     OUT: 1363936 bytes

  IN: 2 mbps    OUT: 10 mbps

  IN: 349612 bytes     OUT: 1361852 bytes

  IN: 2 mbps    OUT: 10 mbps

  IN: 348684 bytes     OUT: 1358952 bytes

  IN: 2 mbps    OUT: 10 mbps

  IN: 349998 bytes     OUT: 1359092 bytes

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转载自liangjian103.iteye.com/blog/1073783
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