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In computing, a command is a directive to a computer program to perform a specific task. It may be issued via a command-line interface or as input to a network service as part of a network protocol , or as an event triggered in a graphical user interface .
A command-line interface ( CLI) is a means of interacting with a computer program by inputting lines of text called command-lines. Command-line interfaces emerged in the mid-1960s, on computer terminals, as an interactive and more user-friendly alternative to the non-interactive interface available with punched cards .
In computing, a shell is a computer program that exposes an operating system's services to a human user or other programs. In general, operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation.
Jul 21, 2016 · A Brief History. Way back in the 1960s — 70s, computers were becoming more than just calculators. They could save files to disk and have multiple running applications with multiple users. But these things were difficult to control and easy to break. Thankfully, there was a very smart idea to cover all these internal bits in a nice, usable shell.
Apr 5, 2022 · head test.txt // Output: this is the beginning of my test file. tail works the same but it will show you the end of the file. tail test.txt // Output: this is the end of my test file. The --help flag can be used on most commands and it will return info on how to use that given command. cd --help // output:
Computing. Military. Music. Sports. Other uses. See also. Command. Look up command in Wiktionary, the free dictionary. Command may refer to: Computing. Command (computing), a statement in a computer language. command (Unix), a Unix command. COMMAND.COM, the default operating system shell and command-line interpreter for DOS.
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Xyzzy (computing) In computing, Xyzzy is sometimes used as a metasyntactic variable or as a video game cheat code. Xyzzy comes from the Colossal Cave Adventure computer game, where it is the first "magic string" that most players encounter (others include "plugh" and "plover"). [1]
