Linux服务器网卡流量查看方法 shell和Python各一枚

  #!/bin/sh  #by ljk 20160526    if [ "$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 -1  fi    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 %-4sn" IN: $speed_RX Mb/s OUT: $speed_TX Mb/s  done    

  #!/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 stopn')       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-----")