How to check if a port is open in Linux

First we open the Linux command operation interface to view the port, as shown in the figure:

In order to get more information High authority (view all ports), switch to root user login here

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One way is to use thelsofcommand, taking 80 as an example, as shown in the figure:

If there is no output, it means that the function is not enabled. The port number.

In order to facilitate testing, I detect an open port number here, and the information as shown in the figure will be output:

The second method is to use netstat -aptn command line, view all open port numbers

The command shown in the picture is to view all port numbers using the udp protocol in the system

This command is to view the port number information using the tcp protocol in the system

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