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

Special-purpose and general-purpose computers, SPECIAL-PURPOSE AND GENERAL-...

SPECIAL-PURPOSE AND GENERAL-PURPOSE COMPUTERS In general, there are two types of digital computers. The first is the special-purpose digital computer, which performs a f

Function, write a function named "location_of_largest"that takes as its arg...

write a function named "location_of_largest"that takes as its arguments the following:(1) an array of integer values

How is python Using Blank Lines and Waiting for the User, A line holds onl...

A line holds only whitespace, probably with a comment, is identified as a blank line, and Python completely avoids it. In an interrelated interpreter session, you need to enter an

471, #que411stion..

#que411stion..

What is a view, Question (a) What is a view? (b) Can we use a view t...

Question (a) What is a view? (b) Can we use a view to insert or update a record into a table? Do we have any limitation to perform the above command? (c) The syntax to cr

Product of first n natural numbers-algorithm, Product of first n natural nu...

Product of first n natural numbers - Algorithm Working Procedure : 1. Take n = 8 2. Take I = 1 3. Take PROD = 1 4. Compute PROD = PROD * 1 5. add 1 to 1 6. If I≤ n, complete

On-line and realtime systems, On-line and Realtime Systems An on-line s...

On-line and Realtime Systems An on-line system means that input and output devices are directly connected to the CPU irrespective of geographical location. Thus the user can di

How should an ideal hospital software be? , How Should an Ideal Software be...

How Should an Ideal Software be?  It should be easy to operate, with minimal training of nursing personnel.   Should be reliable, and thoroughly tested in various nur

Program and programming language, Program and Programming Language : ...

Program and Programming Language : A Program is defined as a collection of statements/ instructions that enable the computer to solve a problem. The process of writing a prog

Linux Calculator in Java, Hello, Could you create a linux calculator using ...

Hello, Could you create a linux calculator using very basic java code (not complex, because I am a novice java coder). It should be called into the terminal for interaction. Thank

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