linux中如何查询端口被占用的情况

# 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 

1 #!/usr/bin/env Python
  2 # -*- coding:utf-8 -*-
  3 
  4 import socket, time, thread
  5 socket.setdefaulttimeout(3) #设置默认超时时间
  6 
  7 def socket_port(ip, port):
  8     """
  9     输入 IP 和端口号，扫描判断端口是否占用
 10     """
 11     try:
 12         if port >=65535:
 13             print u'端口扫描结束'
 14         s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 15         result=s.connect_ex((ip, port))
 16         if result==0:
 17             lock.acquire()
 18             print ip,u':',port,u'端口已占用'
 19             lock.release()
 20     except:
 21         print u'端口扫描异常'
 22 
 23 def ip_scan(ip):
 24     """
 25     输入 IP，扫描 IP 的 0 -65534 端口情况
 26     """
 27     try:
 28         print u'开始扫描 %s' % ip
 29         start_time=time.time()
 30         for i in range(0,65534):
 31             thread.start_new_thread(socket_port,(ip, int(i)))
 32         print u'扫描端口完成，总共用时：%.2f' %(time.time()-start_time)
 33 #       raw_input("Press Enter to Exit")
 34     except:
 35         print u'扫描 ip 出错'
 36 
 37 if __name__=='__main__':
 38     url=raw_input('Input the ip you want to scan:')
 39     lock=thread.allocate_lock()
 40     ip_scan(url)

# Python scan_port.py
Input the ip you want to scan: 20.0.208.112
开端扫描 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
扫描端口完结，一共用时：9.38

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