What is a command line interface (CLI)?

A command line interface (CLI) is fundamentally a text-based interface used for interacting with a computer or software by typing commands directly. This interaction allows users to execute specific tasks, run scripts, manage files, and perform other operations by entering text commands, rather than using graphical icons or menus as in graphic-based user interfaces. The advantages of a CLI include greater control over the operating system, the ability to script complex tasks, and the speed at which advanced users can navigate and manipulate their systems.

In contrast to graphic-based user interfaces, which are more visually oriented and may involve mouse clicks and drag-and-drop functionality, a CLI requires the user to be familiar with the syntax and commands of the system they are working with. It's particularly favored in server administration and automation tasks because of its efficiency and the ability to create scripts for repeatable tasks, facilitating automation and scripting methodologies that are essential in programming and IT operations.