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This article mainly introduces the method of linux to check the port occupation, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

How linux checks port occupancy: use [lsof-I port number or netstat-tunlp | grep port number] to see what process the port is occupied by.

How linux looks at port occupancy:

1. Common commands:

(1) lsof-I port number

(2) netstat-tunlp | grep port number

Both commands can see what processes the port is occupied by.

2. Lsof-I is used to display the process that meets the conditions. Lsof (list open files) is a tool that lists the files opened by the current system. Execute the lsof-I command as the root user, as shown below

The meaning of each column of the lsof output is:

COMMAND: the name of the process or how the process is started

PID: process id

USER: process owner

FD: file descriptor

TYPE: protocol type

DEVICE: Port number

SIZE/OFF: offset

NODE: protocol name

NAME: node name

3. Lsof-I: Port number, which is used to view the occupancy of a port, for example, to check the usage of port 22, lsof-i 22, as shown below

4. Netstat-tunlp is used to display the port and process of tcp,udp, as shown below.

In the command, the words "t _ () _ () u ~ () ~ (n) ~ (1) p have different meanings:"

-t displays only tcp-related

-u displays only those related to udp

-n unlimited time alias, which shows that all numbers are converted to numbers

-l displays only those in the Listen (listening) state

-p displays the name of the program that established these connections

5. Netstat-tunlp | grep port number, which is used to view the progress of the specified port number, such as netstat-tunlp for port 22, as shown in the figure below.

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