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This article mainly explains "linux how to see whether a port is open", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "linux how to see whether a port is open" bar!

Linux check whether a port is open or not: 1, using the lsof command, the command can list the files opened by the system, the syntax is "lsof-I: port number"; 2, using the "netstat-aptn" command, the command can view all open port numbers.

The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What does linux think about whether a port is open?

First of all, let's open the command operation interface of the Linux that you want to view the port. In order to get higher permissions, switch the root user login.

The first method is to use the lsof-I: Port number command line, taking 80 as an example

If there is no output, the port number is not opened. In order to facilitate testing, I detect an open port number here, and the information shown in the figure will be output.

The second way is to use the netstat-aptn command line to check all open port numbers

Thank you for your reading, the above is the content of "linux how to see whether a port is open". After the study of this article, I believe you have a deeper understanding of how linux sees whether a port is open or not, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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