CLI (Command Line Interface)
Command Line Interface
An interface for operating a computer using only keyboard text input.
In Simple Terms
CLI is a way to control your computer by typing text commands on your keyboard. Think of those movie scenes where hackers rapidly type away on black screens — that text-based input method is exactly what CLI looks like. Instead of clicking icons with a mouse, you type specific commands to create files, run programs, and more.
Behind the Name
CLI stands for Command, Line, and Interface — the first letters of the three words that make up its full name. The name comes from the idea of entering a single line of text to send a command to your computer. It's also commonly referred to as the "command line" or CUI (Character User Interface).
Take a Closer Look!
CLI stands for Command Line Interface — a system that lets you control a computer by typing text "commands" on a keyboard.
When most people use smartphones or computers, they tap icons and click buttons to get things done. That's called a GUI (Graphical User Interface).
CLI, by contrast, relies entirely on text displayed on the screen.
While it may look intimidating at first, CLI has some major advantages.
For example, renaming dozens of files at once or automating repetitive tasks is something CLI handles far better than a GUI.
CLI also puts very little load on a computer, making it a go-to tool for managing remote servers and a staple in many programming and development environments.
To put it simply, think of it as a power-user control panel — no mouse required.
On any regular computer, you can try CLI by opening the "Terminal" app (on Mac or Linux) or "Command Prompt" (on Windows).