linux查看主機網卡流量

#!/bin/bash
#network
#Mike.Xu
while : ; do
time='date+%m"-"%d" "%k":"%M'
day='date+%m"-"%d'
rx_before='ifconfigeth0|sed -n "8"p|awk '{print $2}'|cut -c7-'
tx_before='ifconfigeth0|sed -n "8"p|awk '{print $6}'|cut -c7-'
sleep 2
rx_after='ifconfigeth0|sed -n "8"p|awk '{print $2}'|cut -c7-'
tx_after='ifconfigeth0|sed -n "8"p|awk '{print $6}'|cut -c7-'
rx_result=$[(rx_after-rx_before)/256]
tx_result=$[(tx_after-tx_before)/256]
echo "$timeNow_In_Speed: "$rx_result"kbps Now_OUt_Speed:"$tx_result"kbps"
sleep 2
done