How to Find the Process That is Using a Port

When developing multiple applications or trying out demos, it is common to have multiple programs running on different ports on your computer. However, it can be challenging to remember which application is running on a specific port. In this blog post, we will discuss how to determine which program is listening on a port using the lsof command.

To find the program that is listening on a specific port, you can use the following command:

lsof -i :<port number>

For example, to find the program listening on port 1313, you can run:

lsof -i :1313

This command will display the following output, providing information about the command, PID, user, file descriptor, device, size/offset, node, and name associated with the port:

COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
hugo 8698 fla 4764u IPv4 0xc72ca30d18e45ef9 0t0 TCP localhost:bmc\_patroldb (LISTEN)

In this example, the program hugo with PID 8698 is listening on port 1313.

If you want to terminate the program that is using the port, you can use the kill command followed by the PID. For instance, to terminate the program with PID 8698, you can run:

kill 8698

By following these steps, you can easily identify the process that is using a specific port and terminate it if needed. Keep in mind that you should exercise caution when terminating processes, as it may impact other running applications.

Tags: port, process, lsof, command, terminate