View Linux Server NIC traffic small script shell

Sometimes we need to look at the network card traffic on the server in real time, here I write a shell script. The script uses a while true "dead loop", every 10s from "/proc/net/dev" to take a value and calculates the average bandwidth within 10s based on the difference within 10s; Press CTRL + C to stop execution. Scripts are compatible with CENTOS6 and 7, the scripts are not too complex, and the annotations in the script are more nuanced, so I don't have to explain the script much.

Note: 1kb=8 bytes, 1mb=1024kb

#!/bin/sh if [  " = "  ];then     #判断后面是否有跟参数      echo -e  "\n      use interface_name after  The script,like \ "script eth0\" ... \ n "    exit -1fi echo -e   "\n      start monitoring the $1,press \" ctrl+c\ "  to stop "echo ---------------------------------------------------------- file=/proc/net/ dev     #内核网卡信息文件while  true    do    rx_bytes= ' cat  $file |grep $1|sed  ' s/^ *//g ' |awk -f ' [ :]+ '   ' {print $2} '       #这里sed这一步为了同时兼容centos6和7     tx_bytes= ' cat  $file |grep $1|sed   ' s/^ *//g ' |awk -f ' [ :]+ '   ' {print $10} '     sleep 10     rx_byteS_later= ' cat  $file |grep $1|sed  ' s/^ *//g ' |awk -f ' [ :]+ '   ' {print $2} '     tx_bytes_later= ' cat  $file |grep $1|sed  ' s/^ *//g ' |awk -F ' [  :]+ '   ' {print $10} '       #B *8/1024/1024=mb     speed_rx= ' echo  ' scale=2 ($RX _bytes_later -  $RX _bytes) *8/1024/1024/10 "|BC"      speed_tx= ' echo  ' scale=2 ($TX _bytes_later -  $TX _bytes) *8/1024/1024/10 "|BC"       printf  "%-3s %-3.1f %-10s %-4s %-3.1f %-4s\n"  in: $ speed_rx mb/s out:  $speed _tx mb/sdone

This article is from the "burning Years of Passion" blog, please be sure to keep this source http://liuzhengwei521.blog.51cto.com/4855442/1786936

View Linux Server NIC traffic small script shell