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

What is packet switching? explain, Question 1 What are the five subscriber...

Question 1 What are the five subscriber-related signaling functions performed by the operator? Question 2 Compare Microprogrammed control and Hard-wired control Que

If staement, if statement with explanation

if statement with explanation

Homework , Using only the digits 1-6 how many five digit numbers can be for...

Using only the digits 1-6 how many five digit numbers can be formed? How many of these have at least a 5? How many of them have either no 5 or no 6?

The microprocessor, THE MICROPROCESSOR The three fundamental units, whi...

THE MICROPROCESSOR The three fundamental units, which comprise a CPU, have now been discussed in general terms.  So too has a microprocessor, because a microprocessor can be de

Development of UNIX , Development of UNIX: The original UNIX developme...

Development of UNIX: The original UNIX development was performed on a Digital PDP-7 minicomputer and later moved to a PDP-11 minicomputer, the forerunner of the VAX computer.

What technical challenges must be overcome, QUESTION a) Clearly explain...

QUESTION a) Clearly explain three main issues arising in the design of components for use in Intranets. b) Explain the term "location-aware Computing". c) The Internet en

Telecommunications, Telecommunications: 'Data communications', 'Commun...

Telecommunications: 'Data communications', 'Communications technology', 'Computer telecommunications', Compunications', 'Telecomputing', etc., are just some of the terms we co

Program planning (preparation of a flow chart), Program Planning (Preparati...

Program Planning (Preparation of a Flow Chart) A flow chart is a graphic method for indicating a proposed or actual solution to the problem. A flow chart shows the steps a comp

Reflex agent-artificial intelligence, Reflex agent-Artificial Intelligence ...

Reflex agent-Artificial Intelligence If an agent decides and executes an action in response to a sensor input without consultation of its world, then it may be considered a ref

Describe 3 components of a pattern, QUESTION (a) Compare the adapter pa...

QUESTION (a) Compare the adapter pattern with the façade and decorator patterns. (b) Illustrate a two-way adapter pattern. (c) Describe 3 components of a pattern. (d)

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