linux流量监控脚本

#!/bin/bash`#
R1=`cat /sys/class/net/eth0/statistics/rx_bytes`
T1=`cat /sys/class/net/eth0/statistics/tx_bytes`
sleep 1
R2=`cat /sys/class/net/eth0/statistics/rx_bytes`
T2=`cat /sys/class/net/eth0/statistics/tx_bytes`
TBPS=`expr $T2 - $T1`
RBPS=`expr $R2 - $R1`
TKBPS=`expr $TBPS / 1024`
RKBPS=`expr $RBPS / 1024`

echo "上传速率 eth0: $TKBPS kb/s 下载速率 eth0: $RKBPS kb/s at $(date +%Y%m%d%H:%M:%S)" >>/usr/monitor/network/network_$(date +%Y%m%d).log
当天最高上传及下载流量统计
TX=0;
RX=0;
MAX_TX=0;
MAX_RX=0;
while read line
do
a=`echo $line | grep "eth0" |awk '{print $3}'`
if [ $a -ge 0 ]
then
TX=$a
if [ $TX -ge $MAX_TX ]
then
MAX_TX=$TX
fi
fi
b=`echo $line | grep "eth0" |awk '{print $7}'`
if [ $b -ge 0 ]