Final answer:
The 'kill' command is used to terminate non-system processes on Unix, Linux, and Windows without restarting the computer, differentiating it from other commands like 'Shutdown' or 'Erase'.
Step-by-step explanation:
The appropriate command line tool to terminate a non-system process without needing to restart the computer is the kill command. This tool sends a signal to the process that instructs it to terminate. It's commonly used in Unix, Linux, and Windows operating systems to manage system processes. Unlike Shutdown, which turns off or restarts the computer, kill specifically targets individual processes. The command Erase is used for deleting files, not processes, and Break is typically used to interrupt batch files or scripts rather than terminate a process.