检测网卡流量的shell脚本

#!/bin/bash
#edit by www.jb200.com
NIC=eth1
while : ; do
  time=`date +%m"-"%d" "%k":"%M`
  day=`date +%m"-"%d`
  rx_before=`ifconfig $NIC|sed -n "8"p|linuxjishu/13830.html target=_blank class=infotextkey>awk '{print $2}'|cut -c7-`
  tx_before=`ifconfig $NIC|sed -n "8"p|awk '{print $6}'|cut -c7-`
  sleep 2
  rx_after=`ifconfig $NIC|sed -n "8"p|awk '{print $2}'|cut -c7-`
  tx_after=`ifconfig $NIC|sed -n "8"p|awk '{print $6}'|cut -c7-`
  rx_result=$[(rx_after-rx_before)/256]
  tx_result=$[(tx_after-tx_before)/256]
  echo "$time Now_In_Speed: "$rx_result"kbps Now_OUt_Speed: "$tx_result"kbps"
  sleep 2
done

#chmod +x check_interface.sh

#./check_interface.sh