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

Use triggers to maintain referential integrity, At times, Brewbean''s has c...

At times, Brewbean''s has changed the id number for existing products. In the past, they have had to add a new product row with the new id to the BB_PRODUCT table, modify all the c

Hrm , online project on hrm i.e index page

online project on hrm i.e index page

Flowcharts, flowchart that display yhe students average scores for 3 quizze...

flowchart that display yhe students average scores for 3 quizzes.Assume that there are 3 sections having 5 student each.Valid number is 1-100 for the quizzes.Enter an invalid numbe

What is vpn? list the different types of vpn, Question 1 What is routing? ...

Question 1 What is routing? Explain the principles of routing Question 2 Explain different types of server operations in Enterprise Networking Question 3 Briefly d

What is evaluating information system investments, 1. What is Evaluating In...

1. What is Evaluating Information System Investments? 2. Is IS evaluation different to evaluation of other investments? 3. What approaches are used to evaluate IS investments

Specify the steps to creating a powerpoint presentation, FUNDAMENTALS OF CO...

FUNDAMENTALS OF COMPUTERS 1. Describe the importance of video in multimedia. What are some of the tips to keep in mind while making video for the web? 2. Specify the steps t

Html, a program to create htmlpage

a program to create htmlpage

Web Design Project, Hello - What is the turn around time for a 6 page websi...

Hello - What is the turn around time for a 6 page website.

Obtain the truth table and a boolean expression, Problem 1. Convert the...

Problem 1. Convert the following number system 12.34 (8) to binary number system 23BC.0A (16) to decimal number system 456.012 (16) to Octal number system 123

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