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This article mainly describes how to check whether a port is occupied in LINUX, the article is very detailed, has a certain reference value, interested friends must read it!

1. netstat -anp |grep port number

Here's what I'll do with 3306, netstat -anp.| grep 3306 (Note below, I am operating as an ordinary user, so I add sudo. If I am operating as a root user, I can view it without adding sudo), as shown in Figure 1 below:

In Figure 1, the monitoring status LISTEN indicates occupied, and the last column indicates occupied by mysqld. Check the specific port number. As long as the row in Figure 1 indicates occupied.

2. netstat -nultp (no port numbers here)

This command is to view all currently used ports, as shown in Figure 2:

You can see that my port 82 is not occupied.

3. netstat -anp |grep 82 View the usage of port 82, as shown in Figure 3:

It can be seen that there is no LISTEN line, so it means that it is not occupied. Note here that LISTENING shown in the figure does not mean that the port is occupied. Don't confuse it with LISTEN. When viewing the specific port, you must see tcp, port number, and LISTEN to indicate that the port is occupied.

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