Final answer:
To kill all processes for a user in Linux, you can use the pkill command followed by the -U option and the username.
Step-by-step explanation:
To kill all processes for a user in Linux, you can use the pkill command followed by the -U option and the username. This command will send a signal to terminate all processes owned by that user. To kill all processes for a user in Linux, you can use the pkill command followed by the -U option and the username. Here's the command:
pkill -U username
For example, to kill all processes for the user 'john', you would use the following command:
pkill -U john
Note that this command will terminate all processes, which may include important system processes. So, be cautious when using it.