linux网络速率监控

lidonghe

#!/bin/bash
#作者：fafu_li
#时间：2015.10.14
#监控网卡传输速率
source /etc/profile            #加载系统环境变量
source $HOME/.bash_profile    #加载用户环境变量
set -o nounset                 #引用未初始化变量时终止执行,也可以set -u
#set -o errexit                #执行任何语句返回非0状态时终止执行,也可以set -e
#定义监控的网卡
INET=("eth0" "lo")
net_monitor() {
interface=$1
ifconfig $interface > /dev/null 2>&1
if [[ $? != 0 ]];then
echo "$interface 不存在"
else
RX1=$(cat /proc/net/dev | grep $interface | awk -F ":" '{print $2}' | awk -F " " '{print $1}')
TX1=$(cat /proc/net/dev | grep $interface | awk -F ":" '{print $2}' | awk -F " " '{print $9}')
sleep 1
RX2=$(cat /proc/net/dev | grep $interface | awk -F ":" '{print $2}' | awk -F " " '{print $1}')
TX2=$(cat /proc/net/dev | grep $interface | awk -F ":" '{print $2}' | awk -F " " '{print $9}')
let total_RX=$RX2-$RX1
let total_TX=$TX2-$TX1
if [ $total_RX -lt 1024 ];then
total_RX="${total_RX} B/s"
elif [ $total_RX -gt 1048576 ];then   
total_RX=$(echo $total_RX | awk '{printf "%.2f",$1/1048576}')" MB/s"
else
total_RX=$(echo $total_RX | awk '{printf "%.2f",$1/1024}')" KB/S"
fi
if [ $total_TX -lt 1024 ];then
total_TX="${total_TX} B/s"
elif [ $total_TX -gt 1048576 ];then   
total_TX=$(echo $total_TX | awk '{printf "%.2f",$1/1048576}')" MB/s"
else
total_TX=$(echo $total_TX | awk '{printf "%.2f", $1/1024}')" KB/S"
fi
echo "$interface 接收: $total_RX 发送: $total_TX"
fi
}
while true;do
echo "---------------------------------------------------------------"
for i in ${INET[@]};do
net_monitor $i
done
done