shell脚本监控linux网卡流量(上传/下载/流入/流出)

shell脚本监控linux网卡流量(上传/下载/流入/流出)

从网上找的一个脚本, diy了一下, 觉得很OK, ~_~

#!/bin/sh

#filename: monitor_eth_flow.v2.sh    
#功能: 监控网卡进出流量
#用法: 
#   sh monitor_eth_flow.v2.sh
#   sh monitor_eth_flow.v2.sh eth0
#   sh monitor_eth_flow.v2.sh eth0 1 
#

function calcFlow()
{
	before=$1
	after=$2
	seconds=$3
	title=$4
	
	if [ -z "$before" ]; then  
			before=0  
	fi  
	if [ -z "$after" ]; then  
			after=0  
	fi  
	if [ $after -ge $before ]  
	then  
		  diffentvalue=$((($after-$before)/$seconds));  
	else  
		  diffentvalue=$((($after+4*1024*1024*1024-$before)/$seconds));  
	fi  
	diffentvalue=${diffentvalue#-}  
	if [ $diffentvalue -ge 1073741824 ]; then  
		 resultend=$(($diffentvalue/1073741824));  
		 unit=GB/s;  
	elif [ $diffentvalue -ge 1048576 ]; then  
		 resultend=$(($diffentvalue/1048576));  
		 unit=MB/s;  
	elif [ $diffentvalue -ge 1024 ]; then  
		 resultend=$(($diffentvalue/1024));  
		 unit=KB/s;  
	else  
		 resultend=$diffentvalue ;  
		 unit=B/s;  
	fi
	echo "$title $resultend$unit" 
}


#监控网卡名, eth0/eth1/lo
if [ "-$1" = "-" ] ;then
    eth="eth0" #默认eth0
else
    eth=$1
fi

#监控时长
if [ "-$2" = "-" ] ;then
    sleep_seconds=5 #默认5秒
else
    sleep_seconds=$2
fi

echo "网卡 $eth 流量计算中, 请等待$sleep_seconds秒钟......(Ctrl+C停止)"; echo "";
while((1==1)); do
	resultIn=$(ifconfig $eth | grep -e 'RX bytes'|awk '{print $2}'|awk -F':' '{print $2}');
	resultOut=$(ifconfig $eth | grep -e 'RX bytes'|awk '{print $6}'|awk -F':' '{print $2}');
	sleep $sleep_seconds;
	resultIn2=$(ifconfig $eth | grep -e 'RX bytes'|awk '{print $2}'|awk -F':' '{print $2}');  
	resultOut2=$(ifconfig $eth | grep -e 'RX bytes'|awk '{print $6}'|awk -F':' '{print $2}');
	
	echo $(date +'%Y-%m-%d %H:%M:%S')
	calcFlow $resultIn  $resultIn2  $sleep_seconds  "下载流量(进): ";
	calcFlow $resultOut $resultOut2 $sleep_seconds  "上传流量(出):"; echo "";
done