View Linux Server NIC traffic small script shell and Python example

Sometimes we need a more real-time view of the network card traffic on the server, here I wrote two small scripts, one with the shell (first write, only one network card can be viewed at a time), the other with Python (after the write, one can view multiple network cards). 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 compatible with CENTOS6 and 7

Two scripts are not too complicated, and the annotations in the script are more detailed, so I don't have much to explain the script content. Directly on the script:

Shell version-using:

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Shell Version Code:

#!/bin/sh#by ljk 20160526if [  "$"  =  " ];then    #" Determine if the following parameters     echo -e  "\n      use interface_ Name after the script,like \ "script eth0\" ... \ n "    exit - 1fiecho -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

Python version-using:
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Python Version code:

#!/bin/env python3#by ljk 20160526import os,re,sys,timeif len (SYS.ARGV)  ==  1:    print (' \ n use: Please keep up with the name of the network card, you can connect the "single network Card"/"Multiple network cards, separated by a space". \ n ')     sys.exit (100 ) else:    print (' start monitoring,press  ' CTRL + C '  to stop\n ')      for arg in sys.argv[1:]:     #输出标头          header =  '------{} bandwidth (MB/s)------'. Format (ARG)          print (Header.ljust (+), end= ")     print ()       #global  values_dic    values_dic = {}     #定义空字典, The value to be used to store each NIC in the following function     def get_values (orders):         try:            with open ('/proc/ Net/dev ')  aS f:                lines =f.readlines ()      #内容不多, easy to read at once                  for arg in sys.argv[1:]:                     for line  in lines:                         line=line.lstrip ()      #去掉行首的空格, So that the following split                         if re.match (Arg,line):                              values&Nbsp;= re.split ("[ :]+", line)      #以空格和: as separators                               values_dic[arg+ ' R ' +orders]=values[1]     #1为接收值                               values_dic[arg+ ' t ' +orders]=values[9]     #9为发送值                               #return  [values[1],values[9]]      #可返回列表         except  (Fileexistserror, Filenotfounderror,permissionerror):             Print (' Open file error ')  &nBsp;          sys.exit ( -1)     try:         while True:             get_values (' first ')      #第一次取值              time.sleep (Ten)              get_values (' second ')      #10s后第二次取值              for arg in sys.argv[1:]:                 r_bandwidth =  (int (values_dic[arg+ ' r ' + ') Second '])  - int (values_dic[arg+ ' r ' + ' first '))/1024/1024/10*8                 t_bandwidth =  (int (values_dic[arg+ ' t ' + ') Second '])  - int (VAlues_dic[arg+ ' t ' + ' first '))/1024/1024/10*8                 print (' in:  ' +str (Round (r_bandwidth,2)). Ljust (8) + '   OUT:  ' + Str (round (t_bandwidth,2)). Ljust (+), end= ')              print ()             values_dic = {}      #清空本次循环后字典的内容     except KeyboardInterrupt:         print ("\ n-----Bye-----")

These two scripts are still very convenient and practical, sharing out hope to give friends a little convenience in their work.

This article is from "Endeavor K" blog, please be sure to keep this source http://kaifly.blog.51cto.com/3209616/1783530

View Linux Server NIC traffic small script shell and Python example