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How to Kill a Linux Process Using a Port Number


Linux provides a robust and versatile environment for running various processes. Occasionally, it becomes necessary to stop a specific process, especially when it's causing issues or conflicting with other services. In this guide, we'll explore how to stop a Linux process using a port number.

Identifying the Port Number

Before stopping a process, it's crucial to identify the port number associated with the service. You can use the following command to list all the processes and their corresponding port numbers:

sudo netstat -tulpn | grep LISTEN

This command displays a list of all processes that are currently listening for incoming connections, along with their respective port numbers. Identify the process you want to stop and note its port number.

Stopping the Process

Once you have identified the port number, you can use the lsof (List Open Files) command along with kill to stop the process. Here's a step-by-step guide:

Install lsof (if not already installed):

sudo apt-get install lsof

This command installs the lsof utility on Debian-based systems. For other distributions, you can use their respective package manager.

Find the Process ID (PID) using the Port Number:

sudo lsof -i :<port_number>

Replace <port_number> with the actual port number you want to investigate. This command retrieves the PID associated with the specified port.

Stop the Process:

Once you have the PID, use the kill command to stop the process:

sudo kill <pid>

Replace <pid> with the actual Process ID you obtained from the previous step.

If the process doesn't stop immediately, you can use the -9 option to forcefully terminate it:

sudo kill -9 <pid>

This ensures that the process is terminated forcefully.

Stopping a Linux process using a port number is a straightforward process that involves identifying the PID associated with the port and then using the kill command to stop it. However, exercise caution, especially when using the -9 option, as it forcefully terminates the process without allowing it to perform cleanup operations. Always ensure that stopping a process won't have unintended consequences on your system or other services.

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Posted: 2024-01-13
By: dwirch
Viewed: 155 times

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