How can you add a new user account named 'newguy' to a system?

To add a new user account named 'newguy' to a Linux system, the command useradd newguy is the commonly used method. This command directly invokes the useradd utility, which is designed to create new user accounts on the system.

When you use useradd, you can also specify additional options such as the home directory, shell, and user ID. By default, if no options are provided, it will create the user with a standard configuration, typically including a home directory under /home/newguy and a default shell, if configured to do so.

It's important to highlight that while the adduser command exists on many systems, particularly Debian-based distributions, it is often a front-end to useradd with some added user-friendly features, yet it's not the core command name specifically designed for the task of account creation in a universal context.

Other choices such as createuser and newuser do not correspond to standard Linux commands for creating user accounts, making them invalid in this scenario. Utilizing the correct command ensures that the user account is established with the appropriate configurations and settings, which is essential for system administration tasks.