Shell脚本查看网卡实时流量

#!/bin/bash

while [ "1" ]

do

eth=$1

RXpre=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $2}')

TXpre=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $10}')

sleep 1

RXnext=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $2}')

TXnext=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $10}')

clear

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

RX=$((${RXnext}-${RXpre}))

TX=$((${TXnext}-${TXpre}))

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 "$eth t $RX   $TX "

done

调用方式:

./traff.sh eth1

或

bash traff.sh eth1

可以实时显示网卡流量大小: