Linux脚本监控实时网络流量

转自 https://blog.csdn.net/dujian996099665/article/details/72621371

#!/bin/bash
ethn=$1

while true
do
  RX_pre=$(cat /proc/net/dev | grep $ethn | sed \'s/:/ /g\' | awk \'{print $2}\')
  TX_pre=$(cat /proc/net/dev | grep $ethn | sed \'s/:/ /g\' | awk \'{print $10}\')
  sleep 1
  RX_next=$(cat /proc/net/dev | grep $ethn | sed \'s/:/ /g\' | awk \'{print $2}\')
  TX_next=$(cat /proc/net/dev | grep $ethn | sed \'s/:/ /g\' | awk \'{print $10}\')

  clear
  echo -e \"\\t RX `date +%k:%M:%S` TX\"

  RX=$((${RX_next}-${RX_pre}))
  TX=$((${TX_next}-${TX_pre}))

  if [[ $RX -lt 1024 ]];then
    RX=\"${RX}B/s\"
  elif [[ $RX -gt 1048576 ]];then
    RX=$(echo $RX | awk \'{print $1/1048576 \"MB/s\"}\')
  else
    RX=$(echo $RX | awk \'{print $1/1024 \"KB/s\"}\')
  fi

  if [[ $TX -lt 1024 ]];then
    TX=\"${TX}B/s\"
  elif [[ $TX -gt 1048576 ]];then
    TX=$(echo $TX | awk \'{print $1/1048576 \"MB/s\"}\')
  else
    TX=$(echo $TX | awk \'{print $1/1024 \"KB/s\"}\')
  fi

  echo -e \"$ethn \\t $RX   $TX \"

done

运行./net_mon.sh, 结果如下， 每秒刷新一次。