How to check if a port is occupied in Linux

1. Use the netstat command

netstat  -anp  |grep   端口号

as follows, taking 3306 as an example, netstat -anp |grep 3306 ( Note here, the following is operated by an ordinary user, so sudo is added. If it is operated by the root user, you can view it without adding sudo), as shown in Figure 1:

##The above figure mainly shows that the monitoring status is

LISTEN, which means it is occupied. The last column shows that it is occupied by the service mysqld. Check the specific port number.

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2. Use the following command

netstat   -nultp

This command is to view all currently used ports , as shown below:

# It can be seen from the picture that port 82 is not occupied.

3. Use the following command

netstat  -anp  |grep  82

to check the usage of port 82, as shown below:

It can be seen that There is no LISTEN line, so it means it is not occupied.

Note here that the

LISTENING shown in the picture does not mean that the port is occupied. Do not confuse it with LISTEN. When viewing the specific port, you must see the tcp, port number, and LISTEN. One line indicates that the port is occupied.

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