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Published: July 22, 2026
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TL;DR

To kill a process in Linux, you can try these methods:

  1. Kill Command: Gracefully terminates a process by sending a SIGTERM signal.
  2. Killall Command: Forcefully terminates all instances of a process by sending a SIGKILL signal.
  3. pkill Command: Sends a SIGTERM or SIGKILL signal to processes based on specific attributes.
  4. killall5 Command: Sends a SIGTERM signal to all non-essential processes.
  5. xkill Command: Forces-closes unresponsive graphical processes by clicking on them with an X cursor.

Killing processes in Linux can have pitfalls. Common errors include using SIGKILL unnecessarily, terminating critical system processes, insufficient permissions, improper process identification, and neglecting zombie processes. Be cautious to ensure smooth system management.

Discover different methods to kill a process in Linux in the guide below. Also, learn about common errors that can occur when c the process in Linux.

In Linux system administration, managing processes effectively is essential to maintain system stability and optimize resource utilization. Occasionally, there may be instances where it becomes necessary to terminate processes that are causing issues or consuming excessive resources. In this comprehensive guide, I will explore various methods to kill a process in Linux command line and common errors that can occur during the process.

How to Kill a Process in Linux

To kill a process in Linux, you have various methods at your disposal, including the Kill Command for graceful termination, the Killall Command for forceful termination by name, the pkill Command for targeting processes based on attributes, the killall5 Command for system-level termination, and the xkill Command for handling unresponsive graphical processes. 

1. Kill Command

The kill command is an essential tool for gracefully terminating processes in a Linux environment. This method is best used when you want to end a process smoothly, giving it a chance to handle any ongoing tasks and release resources gracefully. Follow these steps:

Identify the process to be terminated:

  1. Open a Terminal window.
opening terminal 34
  1. Use the ps command to list all processes currently running on the system. Note the PID (Process ID) of the process you want to terminate.
listing active processes
  1. Execute the following command:

<strong>kill -15 PID</strong>

Replace PID with the actual Process ID of the target process.

  1. This sends a SIGTERM signal to the process, allowing it to clean up before termination. Check if the process has been terminated by using the ps command.
killing specific process

2. Killall Command

The killall command provides a forceful approach to terminate processes based on their names. It is useful when you need to deal with multiple instances of the same process quickly. Here is the step-by-step guide to it:

  1. Launch the Terminal and identify the process name to be terminated:
  2. Run the following command (with sudo, if necessary):

<strong>sudo killall -9 process_name</strong>

Replace process_name with the name of the target process.

  1. Be cautious when using -9 (SIGKILL) as it terminates the process immediately without allowing cleanup. Check if all instances of the process have been terminated using the ps command or monitoring tools.
killing all instances of a process

3. pkill Command

The pkill command is a versatile tool that allows you to target processes based on specific attributes such as process names or user ownership. It provides a more granular approach to process termination and is best used when you want to terminate specific processes efficiently and in a controlled manner. Follow these steps:

  1. Identify the processes to be terminated based on specific attributes:
  2. Access the command window and determine the attributes (e.g., process name, user) of the target processes. Enter the following command:

<strong>pkill -u username process_name</strong>

Replace username with the name of the user owning the target processes and replace process_name with the name of the target process.

killing process based on attributes

4. killall5 Command

The killall5 command is a powerful tool to initiate system-level termination by sending a SIGTERM signal to all non-essential processes. It should be used with utmost care, primarily during system shutdown or in critical situations, to avoid disrupting essential system operations and ensure a smooth shutdown process. Follow these steps:

  1. Open the command prompt and use the killall5 command to initiate system-level termination.
  2. Execute the following command (with sudo, if necessary):

<strong>sudo killall5 -15</strong>
  1. This sends a SIGTERM signal to all non-essential processes, allowing them to clean up before termination.
terminating processes on system level

5. xkill Command

When graphical applications become unresponsive and fail to close through conventional means, the xkill command comes to the rescue. This method is ideal for dealing with unresponsive applications on the graphical user interface (GUI) without resorting to Terminal-based solutions. Follow these steps:

  1. Enter your Terminal window and execute the following command: