How to check the port of linux

The parameters of the netstat command are described as follows:                                                                                                                                                      

## All ports and process services on the current server can be displayed. Combined with grep, you can view a specific port and service status.

　　-t : 指明显示TCP端口
　　-u : 指明显示UDP端口
　　-l : 仅显示监听套接字(所谓套接字就是使应用程序能够读写与收发通讯协议(protocol)与资料的程序)
　　-p : 显示进程标识符和程序名称，每一个套接字/端口都属于一个程序。
　　-n : 不进行DNS轮询，显示IP(可以加速操作)

View which services and ports are on a server

netstat -ntlp   //查看当前所有tcp端口·
netstat -ntulp |grep 80   //查看所有80端口使用情况·
netstat -an | grep 3306   //查看所有3306端口使用情况·

Check how many ports a service has. For example, if you want to check mysqld

netstat  -lanp

to check the number of connections on a certain port, for example, 3306 port

ps -ef |grep mysqld

# check the connection client IP of a certain port For example, 3306 port######

netstat -pnt |grep :3306 |wc

######nmap port scan######

netstat -anp |grep 3306
netstat -an 查看网络端口 
lsof -i :port，使用lsof -i :port就能看见所指定端口运行的程序，同时还有当前连接。

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