实时监控网卡流量

#!/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