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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchA command-line interface (CLI) is a way to interact with a computer or program by typing text commands and reading text responses. In a typical setup, a terminal displays the interaction, a shell interprets what you type, and a command-line tool performs a specific task.
What is a command-line interface?
A CLI is an interface based on text commands rather than selecting actions solely through graphical controls such as buttons and menus. You enter a command, the computer or program processes it, and the result is usually returned as text.
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The term describes the interaction style, not one particular app. Microsoft Learn describes a command shell as an interactive command-line interface for managing a computer. A program can also provide its own command interface for a particular service or task.
What is the difference between a terminal and a shell?
These terms refer to different roles in a common command-line setup, even though people often use them loosely as synonyms.
| Term | Role | Example |
|---|---|---|
| CLI | The text-based way of interacting with a computer or program. | Entering commands and receiving text output. |
| Terminal | The interface or host that accepts and displays text input and output. | Windows Terminal or Terminal on macOS. |
| Shell | The command interpreter that reads and evaluates input, then runs a shell command or invokes another program. | PowerShell, Windows Command Shell, Bash or zsh. |
| Command-line tool | A program launched from a shell, usually to perform a specific task. | Azure CLI for administering Azure resources. |
In a typical command-line session, the terminal provides the visible text interaction, while the shell processes what you enter. A terminal application can host one or more shells. Apple describes Terminal on Mac as an app for communicating with macOS through a CLI; the shell receives commands and scripts that tell it what to do.
How does a CLI work?
- You type a command into a terminal’s text interface.
- The shell reads and evaluates the input.
- The shell runs a shell command or invokes a program, sometimes passing work to the operating system.
- The result is returned as text for display in the terminal.
For example, in many Unix-like shells, typing pwd displays the current working directory. This example is not universal: available commands vary by shell and operating system.
What is a shell used for?
A shell can accept commands interactively or run commands saved in a file as a script. Depending on the shell, it may also provide programming features such as variables, flow control and functions. Bash, for example, includes interactive features such as command history, aliases, command-line editing and job control.
Shells are commonly used to manage files, configure settings and query information. Saving commands in scripts can make a sequence of steps repeatable, though the commands still need to suit the shell and system where they run.
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What is a command-line tool?
A command-line tool is an application that you run from a shell to carry out a particular task or work with a particular service. Microsoft’s Azure CLI, for instance, is a cross-platform tool for administering Azure resources. It can be used interactively or through scripts, from a shell such as cmd.exe or Bash launched in a terminal.
The distinction is useful: the shell interprets the command, while the tool does the specialized work. Microsoft also lists OpenSSH for Windows as an example of a command-line application.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When should you use a CLI instead of a graphical interface?
Neither interface is universally better. Choose based on the task and how you need to do it:
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- Consider repetition or automation: commands and scripts can make repeatable sequences easier to run consistently.
- Consider discoverability: graphical controls make visible options easier to browse; a CLI requires knowing or finding the relevant command.
- Factor in familiarity: a command interface may be efficient for someone comfortable with its commands, while a graphical interface may be more approachable for someone who is not.
These are practical decision criteria, not a measured performance ranking. The cited documentation does not establish a universal speed or productivity advantage for CLI over GUI.
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