[Turn] to see how the [Linux] linux port is occupied by what process?

https://www.cnblogs.com/CEO-H/p/7794306.html

1, lsof -i: port number

2, netstat -tunlp | grep port number

Can view the designated port is occupied which process

Tools / materials

 

• linux，windows

• xshell

Method / Step

 

1.  

   [Step one] lsof -i

   lsof -i to show compliance with the conditions of the process of the case, lsof (list open files) list the current system is a tool to open the file. Root user to execute lsof -i command , as shown below

   

2.  

   [Step Two] lsof -i: port number

   lsof -i: port number, occupation for viewing a port, such as viewing port 22 usage, lsof -i: 22, as in FIG.

   

3. 3

   [Step three] netstat -tunlp

   netstat -tunlp for displaying relevant circumstances tcp, udp port and processes such as in FIG.

   

4. 4

   [Step Four] netstat -tunlp | grep port number

   netstat -tunlp | grep port number used to view the process designated port number, view the situation as 22 ports, netstat -tunlp | grep 22, as shown below

   

 

https://www.cnblogs.com/Archmage/p/7570716.html

netstat command various parameters as follows:

　　-t: TCP port specified display

　　-u: UDP port specified display

　　-l: listening socket (the so-called socket that enables applications to read and write and send and receive communication protocols (protocol) and program data) display only

　　-p: display the process identifier and program name, and each socket / port belongs to a program.

　　-n: Specifies DNS polling display IP (speed up operation)

To display the current process and all ports on the server service in conjunction with grep to view a specific port and service cases ·

netstat -ntlp // View all current tcp port *

netstat -ntulp | grep 80 // View all 80 port usage ·

netstat -an | grep 3306 // View all 3306 port usage ·

See which service and port a server above

netstat -lanp

View a service has several ports. For example, to view the mysqld

ps -ef | grep mysqld

View a port number of connections, such as port 3306

netstat -pnt |grep :3306 |wc

View of a port connecting clients such as IP port 3306

netstat -anp |grep 3306

netstat -an View network port 

lsof -i: port, use lsof -i: port will be able to see the port to run the specified program, as well as the current connection. 

nmap port scan
netstat -nupl (UDP port type)
netstat -ntpl (TCP type of port)
netstat -anp display system port usage