Linux如何查看端口

# lsof -i:8000

COMMAND   PID USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME

lwfs    22065 root    6u  IPv4 4395053      0t0  TCP *:irdmi (LISTEN)

# netstat -tunlp

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name  

tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      4814/rpcbind       

tcp        0      0 0.0.0.0:5908                0.0.0.0:*                   LISTEN      25492/qemu-kvm     

tcp        0      0 0.0.0.0:6996                0.0.0.0:*                   LISTEN      22065/lwfs         

tcp        0      0 192.168.122.1:53            0.0.0.0:*                   LISTEN      38296/dnsmasq      

tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      5278/sshd          

tcp        0      0 127.0.0.1:631               0.0.0.0:*                   LISTEN      5013/cupsd         

tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      5962/master        

tcp        0      0 0.0.0.0:8666                0.0.0.0:*                   LISTEN      44868/lwfs         

tcp        0      0 0.0.0.0:8000                0.0.0.0:*                   LISTEN      22065/lwfs

# netstat -tunlp | grep 8000

tcp        0      0 0.0.0.0:8000                0.0.0.0:*                   LISTEN      22065/lwfs

-t (tcp) 仅显示tcp相关选项

                                -u (udp)仅显示udp相关选项

                                -n 拒绝显示别名，能显示数字的全部转化为数字

                                -l 仅列出在Listen(监听)的服务状态

                                -p 显示建立相关链接的程序名

#!/usr/bin/env python

  # -*- coding:utf-8 -*-

  import socket, time, thread

  socket.setdefaulttimeout(3) #设置默认超时时间

  def socket_port(ip, port):

  """

  输入IP和端口号，扫描判断端口是否占用

 """

 try:

 if port >=65535:

 print u'端口扫描结束'

 s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)

 result=s.connect_ex((ip, port))

 if result==0:

 lock.acquire()

 print ip,u':',port,u'端口已占用'

 lock.release()

 except:

 print u'端口扫描异常'

 def ip_scan(ip):

      """

      输入IP，扫描IP的0-65534端口情况

      """

      try:

          print u'开始扫描 %s' % ip

          start_time=time.time()

          for i in range(0,65534):

              thread.start_new_thread(socket_port,(ip, int(i)))

          print u'扫描端口完成，总共用时：%.2f' %(time.time()-start_time)

  #       raw_input("Press Enter to Exit")

      except:

          print u'扫描ip出错'

  if __name__=='__main__':

      url=raw_input('Input the ip you want to scan: ')

      lock=thread.allocate_lock()

      ip_scan(url)

# python scan_port.py

Input the ip you want to scan: 20.0.208.112

开始扫描 20.0.208.112

20.0.208.112 : 111 端口已占用

20.0.208.112 : 22 端口已占用

20.0.208.112 : 8000 端口已占用

20.0.208.112 : 15996 端口已占用

20.0.208.112 : 41734 端口已占用

扫描端口完成，总共用时：9.38