Which command would be used to completely kill a process?

The command that is used to completely kill a process is "killall." This command allows for the termination of all processes that match a specified name. When invoked, it sends a termination signal to every instance of the process, effectively ensuring that all associated resources are freed up.

In contrast to identifying a specific process by its Process ID (PID), using "killall" targets processes based on their names, which can be more convenient when handling multiple instances of a program.

While "pkill" also allows for killing processes based on name and can provide more flexibility in specifying criteria, it does not inherently ensure the termination of all instances in the same straightforward way as "killall."

The other terms, such as "PID" and "terminate," do not represent valid commands for killing processes in Linux. "PID" refers to the unique identifier assigned to a process, which can be used by other commands, but lacks functionality on its own to terminate processes. "Terminate" may describe the action but is not recognized as a command in the Linux command-line environment.