网卡流量监控脚本 ( Shell )

#!/bin/bash
# Traffic Monitor
# author: Xiao Guaishou

get_traffic_info(){

  recv=`cat /proc/net/dev | awk -F '[: ]+' '/'"$dev"'/{print $3}'`
  sent=`cat /proc/net/dev | awk -F '[: ]+' '/'"$dev"'/{print $11}'`

}

get_traffic_rate(){

  In=`echo $[($recv - $old_recv) / 1024]`
  Out=`echo $[($sent - $old_sent) / 1024]`

}

read -p '请输入你要监控的网卡设备名：' dev

if ! grep -qP "\b$dev\b:" /proc/net/dev
  then
    echo "你输入的设备不存在，或不是合法的网卡设备"
    exit 1
fi

while :;
  do
    get_traffic_info

    old_recv=$recv
    old_sent=$sent

    sleep 1

    get_traffic_info

    get_traffic_rate

    echo -e "$dev\nInput:\t$In KB/s\nOutput:\t$Out KB/s\n"

done

# End