Linux读取网卡流量脚本

#!/bin/bash

#eval `date "+day=%d; month=%m; year=%Y; hour=%H; minute=%M second=%S"`

#INSTFIL="$year-$month-$day $hour:$minute:$second"

#INSTFIL1="$year-$month-$day" #INSTFIL2="$hour:$minute"

#INSTFIL3="$month-$day"

#INSTFIL4="$hour:$minute:$second"

R2=`cat /sys/class/net/$1/statistics/rx_bytes`

T2=`cat /sys/class/net/$1/statistics/tx_bytes`

NUM=100000

if [ -z "$1" ]; then

echo

echo usage: $0 network-interface

echo

echo e.g. $0 eth0

echo

exit

fi

IF=$1

while true

do

R1=`cat /sys/class/net/$1/statistics/rx_bytes`

T1=`cat /sys/class/net/$1/statistics/tx_bytes`

TBPS=`expr $T1 - $T2`

RBPS=`expr $R1 - $R2`

TKBPS=`expr $TBPS / 100`

RKBPS=`expr $RBPS / 100`

RKBPS1=`echo "scale=3; $RBPS/$NUM"|bc`

eval `date "+day=%d; month=%m; year=%Y; hour=%H; minute=%M second=%S"`

INSTFIL4="$hour:$minute:$second"

echo "$INSTFIL4 tx $1: $TKBPS KB/ rx $RKBPS kb/s 0$RKBPS1 bits/s"

R2=`cat /sys/class/net/$1/statistics/rx_bytes`

T2=`cat /sys/class/net/$1/statistics/tx_bytes`

sleep 1

done