How do I force quit a program in a Linux terminal

If a program in a Linux terminal is not responding, you can force it to quit using the following steps:

Press Ctrl + C. This will send a SIGINT signal to the program, which will usually cause it to terminate.
If that does not work, press Ctrl + Z. This will suspend the program.
Type kill -9 followed by the process ID (PID) of the program. You can find the PID of a program using the ps command. For example, if the PID of the program is 1234, you would type the following command:

bash kill -9 1234

Press Enter. This will send a SIGKILL signal to the program, which will force it to quit.

Note: Forcing a program to quit can cause data loss. Be sure to save any important data before force quitting a program.

Related Questions:

What is the command to suspend a program in a Linux terminal? Ctrl + Z
What is the command to find the process ID of a program in a Linux terminal? ps
What signal does Ctrl + C send to a program? SIGINT
What signal does kill -9 send to a program? SIGKILL
What is the potential risk of force quitting a program? Data loss

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How do I force quit a program in a Linux terminal?