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

Create a database in access, The following are required: Create a ...

The following are required: Create a project in Access.  Your database must have flow and a theme. The database must be normalized.  The content m

statistics, write a 2 page essay operational gaming and monte carlo simula...

write a 2 page essay operational gaming and monte carlo simulation

Write a long note letters to the editor, Question 1 What is meant by typog...

Question 1 What is meant by typography? Describe the process in which one can choose and use type Question 2 What is investigative reporting? Write a long note Question 3

Ms word, what is ms words in parts ms words in life?

what is ms words in parts ms words in life?

Computer science, Explain Canonical cover and Extraneous Attributes with ex...

Explain Canonical cover and Extraneous Attributes with examples.

SCM, advantages of E-SCM?

advantages of E-SCM?

What is .net framework, Qestion 1 What is .Net Framework? Qestion 2 W...

Qestion 1 What is .Net Framework? Qestion 2 Write short notes on constructors and destructors Qestion 3 Explain boxing and unboxing with examples Qestion 4 What is

Language of digital computers, Language of Digital Computers: Digital ...

Language of Digital Computers: Digital computers are electronic devices which operate on two valued logic (On and OFF). The ability of a transistor to act as a switch is the k

Describe the binary search algorithm, QUESTION 1 Describe the binary se...

QUESTION 1 Describe the binary search algorithm using an example of your own. QUESTION 2 (a) By showing all your workings, give a big-O estimate for f(x) = (x + 1)lo

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