Linux服务器网卡流量查看方法 shell和Python各一枚

#!/bin/sh#by ljk 20160526if [ "$1" = "" ];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 -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

#!/bin/env python3 #by ljk 20160526 import os,re,sys,time if len(sys.argv) == 1:   print('/n使用方法：请跟上网卡名称,可接"单个网卡"/"多个网卡,以空格分开"./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(35),end='')   print()   #global values_dic   values_dic = {}  #定义空字典，用来在下面函数中存放各网卡的各项需要用到的值   def get_values(orders):     try:       with open('/proc/net/dev') as f:         lines=f.readlines()  #内容不多，一次性读取较方便         for arg in sys.argv[1:]:           for line in lines:             line=line.lstrip()  #去掉行首的空格，以便下面split             if re.match(arg,line):               values = re.split("[ :]+",line)  #以空格和:作为分隔符               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')       sys.exit(-1)   try:     while True:       get_values('first')  #第一次取值       time.sleep(10)       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(16),end='')       print()       values_dic = {}  #清空本次循环后字典的内容   except KeyboardInterrupt:     print("/n-----bye-----")