Command processor and user interface, Basic Computer Science

Assignment Help:

Command Processor and User Interface:

To the user, the most important and visible services provided by the OS is the user interface and the capabilities that it provides to execute commands which may not be a part of OS.  

Instead these systems consider the user interface as a separate shell that is provided with the operating system and that interacts with the kernel to provide the necessary-user command  capabilities. In UNIX, three different shells, the C shell, the Bourne shell, and the Korn shell are in common use, and many other shells for UNIX are available. Each of these shells provides different command structures and different capabilities.  

Different types of user interface exist. The most common are the graphical user interface, or GUI, and the command line interface. The graphical user interface accepts commands primarily in the form of drop-down menus, mouse movements, and mouse clicks. The command line interface relies on typed commands which provide direct access to various methods within operating system such as File system, I/O system, and network services.

UNIX allows certain class of users called  superusers  to use some kind of commands for  changing the platform or access rights. Command languages extend the power and flexibilities of the operating system and simplify use of the system for less sophisticated users.  


Related Discussions:- Command processor and user interface

Encoders, compare encoders and multiplers

compare encoders and multiplers

Computer security, concepts and components of computer security

concepts and components of computer security

C, Byteland county is very famous for luminous jewels. Luminous jewels are ...

Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec

What is a middleware, QUESTION (a) Using diagrams, describe the 2-tier ...

QUESTION (a) Using diagrams, describe the 2-tier and 3-tier architectures. (b) What is a middleware? Explain the functions of a middleware. Give two examples of middleware.

Storage capacity and cost per bit of storage, Storage capacity and Cost per...

Storage capacity and Cost per bit of storage: Storage capacit y:  It is the amount of data that can be stored in the storage unit. A large capacity is preferred.  Cost pe

How to set up the location (e.g. plaza, how to set up the location (e.g. pl...

how to set up the location (e.g. plaza, hall of fame, lecture theater or etc.) and services that will be used during the exhibition; devices needed; and finally produced a compreh

Courier company , disvange and advantege of providing intternet sservice to...

disvange and advantege of providing intternet sservice to customer

What is a stateless and and a stateful server, StatefulServer, maintains so...

StatefulServer, maintains some information between requests. Requires smaller messages, since some information is kept between contacts, example: FTP, telnet. Stateless Server req

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd