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

Difference between an html and an xhtml page, QUESTION (a) Define four ...

QUESTION (a) Define four special target names use with the TARGET attribute (b) Explain the main difference between an HTML and an XHTML page (c) Give two merits and two

Two-tiered architecture, Two-tiered architecture: This approach basic...

Two-tiered architecture: This approach basically introduced a database server to replace the file server. The emergence of relational database management systems and graphica

E - R diagram, draw the e r diagram for irctc rail ticket reservation onlin...

draw the e r diagram for irctc rail ticket reservation online

Why assembly language is good?, Because it is enormously low level, assembl...

Because it is enormously low level, assembly language can be optimized enormously well. Therefore assembly language is used where the extreme performance is needed for applications

Artificial intelligence-general considerations for search, General Consider...

General Considerations for Search If we can specify the first state, the operators and the goal check for a look for difficulty, then we know where to create, how to move and w

Computer, identify application software from the list? ms excel linux inter...

identify application software from the list? ms excel linux internet explorer adobe photshop sound card driver window disk manger adobe dream weaver windows file explorer

Data communications and networks, A magazine publisher based in Nairobi has...

A magazine publisher based in Nairobi has branch in Kisumu, and one in Mombasa. The company has kept in touch by telephone and courier service. Each office is networked. The networ

Multi-valued attribute dbms, Multi-valued Attribute DBMS Each multi valued ...

Multi-valued Attribute DBMS Each multi valued attribute maps into a separate table. Include also an attribute for the primary key of the entity and relationship type which the attr

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