Linux如何查看端口
1、lsof -i:端口号 用于查看某一端口的占用情况，比如查看8000端口使用情况，lsof -i:8000
# lsof -i:8000COMMAND ??PID USER ??FD ??TYPE ?DEVICE SIZE/OFF NODE NAMElwfs ???22065 root ???6u ?IPv4 4395053 ?????0t0 ?TCP *:irdmi (LISTEN)
可以看到8000端口已经被轻量级文件系统转发服务lwfs占用
2、netstat -tunlp |grep 端口号，用于查看指定的端口号的进程情况，如查看8000端口的情况，netstat -tunlp |grep 8000
# 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 8000tcp ???????0 ?????0 0.0.0.0:8000 ???????????????0.0.0.0:* ??????????????????LISTEN ?????22065/lwfs ?????????
说明一下几个参数的含义：
-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
附加一个python端口占用监测的程序，该程序可以监测指定IP的端口是否被占用。
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)该程序执行结果如下：
# python scan_port.pyInput the ip you want to scan: 20.0.208.112开始扫描 20.0.208.11220.0.208.112 : 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
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原文地址：https://www.cnblogs.com/chinaifae/p/10082388.html