Terminal Definition Terminal The word "terminal" comes from early computer systems that were used to send commands to other computers. Terminals often consist of just a keyboard and monitor, with a connection to another computer. The purpose of a terminal is not to process information like a typical computerbut to send commands to another system.
A typical text terminal produces input and displays output and errors Nano text editor running in the xterm terminal emulator See also: Character-oriented terminal A text terminal, or often just terminal sometimes text console is a serial computer interface for text Terminal definition computer science and display.
Information is presented as an array of pre-selected formed characters. When such devices use a video display such as a cathode-ray tubethey are called a " video display unit " or "visual display unit" VDU or "video display terminal" VDT.
The System console is a text terminal used to operate a computer. Modern computers have a built-in keyboard and display for the console.
Some Unix-like operating systems such as Linux and FreeBSD have virtual consoles to provide several text terminals on a single computer.
The fundamental type of application running on a text terminal is a command line interpreter or shellwhich prompts for commands from Terminal definition computer science user and executes each command after a press of Enter.
This includes Unix shells and some interactive programming environments. In a shell, most of the commands are small applications themselves.
Another important application type is that of the text editor. A text editor occupies the full area of display, displays one or more text documents, and allows the user to edit the documents.
The text editor has, for many uses, been replaced by the word processorwhich usually provides rich formatting features that the text editor lacks. The first word processors used text to communicate the structure of the document, but later word processors operate in a graphical environment and provide a WYSIWYG simulation of the formatted output.
Programs such as Telix and Minicom control a modem and the local terminal to let the user interact with remote servers. On the Internettelnet and ssh work similarly.
In the simplest form, a text terminal is like a file. Writing to the file displays the text and reading from the file produces what the user enters. In unix-like operating systems, there are several character special files that correspond to available text terminals.
For other operations, there are special escape sequencescontrol characters and termios functions that a program can use, most easily via a library such as ncurses. For more complex operations, the programs can use terminal specific ioctl system calls.
For an application, the simplest way to use a terminal is to simply write and read text strings to and from it sequentially. The output text is scrolled, so that only the last several lines typically 24 are visible.
Unix systems typically buffer the input text until the Enter key is pressed, so the application receives a ready string of text.
In this mode, the application need not know much about the terminal. For many interactive applications this is not sufficient.
One of the common enhancements is command line editing assisted with such libraries as readline ; it also may give access to command history.
This is very helpful for various interactive command line interpreters. Even more advanced interactivity is provided with full-screen applications. Those applications completely control the screen layout; also they respond to key-pressing immediately.
This mode is very useful for text editorsfile managers and web browsers. In addition, such programs control the color and brightness of text on the screen, and decorate it with underline, blinking and special characters e.
To achieve all this, the application must deal not only with plain text strings, but also with control characters and escape sequenceswhich allow to move cursor to an arbitrary position, to clear portions of the screen, change colors and display special characters, and also respond to function keys.
The great problem here is that there are so many different terminals and terminal emulatorseach with its own set of escape sequences. In order to overcome this, special libraries such as curses have been created, together with terminal description databases, such as Termcap and Terminfo.
Dumb terminals[ edit ] Dumb terminals are those that can interpret a limited number of control codes CRLFetc. In this context dumb terminals are sometimes dubbed glass Teletypes, for they essentially have the same limited functionality as does a mechanical Teletype.True story, I watched/listened to this video at least 30 times in one night while working in the shop after I saw it once (via recommendation from Rich at Total Punk, that guy knows his shit) and it earwormed me.
Terminal is a word with many meanings. Depending on how it's used, it can describe a place where passengers end their journey, a computer screen and keyboard, or a life-ending disease.
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Parsing. Computer terminal synonyms, Computer terminal pronunciation, Computer terminal translation, English dictionary definition of Computer terminal. adj. 1. Of, at, relating to, or forming a limit, boundary, extremity, or end: the terminal moraine of a glacier.
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