CLI stands for command line interface, a way of interacting with a computer by typing text commands instead of using graphical buttons. A CLI runs inside a terminal and is usually controlled by a shell such as Bash, Zsh, or PowerShell. Many developer tools, version control systems, and build pipelines are driven primarily through CLIs. Because CLIs can be scripted, they are a natural fit for automation and repeatable workflows. They are also common on remote servers where graphical environments may not be available. Learning to use CLIs gives developers fine grained control and deep insight into how systems behave.
how it works
A CLI program reads text input, parses commands and flags, performs actions, and prints output back to the terminal. Commands often follow a structure like tool subcommand options, which makes behaviors predictable and scriptable. CLIs can interact with files, processes, and network resources, making them ideal for operations tasks. Tools like npm or Git provide CLIs that wrap complex operations into concise commands. AI coding agents can help generate or explain CLI commands, but it is still important to understand what each command does before running it, especially on production systems.