Output device
In computer technology, output devices are all devices that make the result of an operation or a program accessible to the outside world. These are in particular:
- Screen / projector for fleeting visible output,
- Printer / plotter for permanent visible output,
- Loudspeaker / headset for audible output,
- Braille display for tangible output.
In connection with an input device , interaction with a computer program is possible.
Null device
The null device , also known as null device, is a virtual output device. It is implemented on various operating systems and is often used to suppress the output of a command in batch processing files. The outputs are redirected to the device for this purpose.
Under Windows / MS-DOS , it is, for example, the device Nul:under Linux and Unix is /dev/null.