command

In computing, a command is a directive to a computer program to perform a specific task. It is typically entered as text at a command prompt by a user and executed by pressing the Enter key. However, some commands may be executed without any input from the user. Commands are generally issued by typing them in at the command prompt, but they can also be read from a script or executed as part of another program. Commands are usually built into the operating system or implemented as separate programs known as commands or utilities. Most operating systems provide a set of commands for everyday tasks such as displaying the contents of a directory or copying files. In addition, users can create their custom commands and scripts to automate frequently-used tasks. Commands can also be executed remotely over a network connection, making it possible to control another computer from afar. When executed, a command performs some action and then exits, returning control to the user. Some commands remain active after execution, providing an environment for further work (such as a text editor or web browser) or continuing to run in the background (such as a music player).