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CLI-based shells offer users a concise and efficient mode of interacting with the OS, without requiring the overhead of a graphical user interface.The following are the two types of operating system shells: The shell defines the boundary between inside and outside. The shell gives users (or other programs) a way to get 'inside' the system to run programs or manage configurations.

In computing, a shell program provides access to an operating system's components. The command line remains an important tool for IT professionals, software developers, sys admins, network administrators and many others who prefer a more precise and reproduceable interface to their systems. The command line dropped in popularity following the introduction of GUI-based personal computer OSes like Microsoft Windows and Apple's 'classic' Mac OS in the 1980s. In addition, programming language development platforms such as Python can support command-line interfaces. The MS-DOS operating system and the command shell in the Windows operating system are examples of command-line interfaces. Most current Unix-based systems offer both a command-line interface and a graphical user interface. Today, most vendors offer the graphical user interface ( GUI) as the default for operating systems (OSes) such as Windows, Linux and macOS. CLIs accept as input commands that are entered by keyboard the commands invoked at the command prompt are then run by the computer. Command-line interfaces are also called command-line user interfaces, console user interfaces and character user interfaces.

Gillis, Technical Writer and EditorĪ command-line interface (CLI) is a text-based user interface ( UI) used to run programs, manage computer files and interact with the computer.

Peter Loshin, Former Senior Technology Editor.

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