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This article mainly introduces the relevant knowledge of "how to use the netstat command to check the port status in Linux". The editor shows you the operation process through the actual case. The operation method is simple, fast and practical. I hope this article "how to use the netstat command in Linux to check the port status" can help you solve the problem.

Netstat command netstat command can display all ports and process services on the current server, and combine with grep to view a specific port and service.

Parameters:

-t: indicates that the TCP port is displayed

-u: indicates that the UDP port is displayed

-l: display only listening sockets (sockets are programs that enable applications to read, write and send and receive protocol and data)

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

-n: show IP without DNS polling (operation can be accelerated)

Display system port usage

Netstat-anp to check the usage of port 3306 (netstat-an looks at the network port, does not show process-related information compared to netstat-anp, and can be used in conjunction with wc to check the number of connections involved in the port)

Netstat-an | grep 3306 | wc-l view all current tcp ports

Netstat-ntlp to view the usage of port 80 in all current tcp

Netstat-ntulp | grep 80 to view the ports of all current UDP types

Netstat-nupl to see which services and ports are on a server

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