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

#algorithm, #to determine whether given year is leap year or not

#to determine whether given year is leap year or not

Nursing care activity module, Nursing Care Activity Module Retrievi...

Nursing Care Activity Module Retrieving of identification data of patient  Assessment of the patient  - Physical - Mental - Personal - Socio-c

C++, You are to code a C++ program that will read the file IntList into an ...

You are to code a C++ program that will read the file IntList into an integer array. There are no more than 20 integers in the file. After all of the data is read into the file,

Constant bit rate atm theory, For the connections that request a static amo...

For the connections that request a static amount of bandwidth that is continuously available during the connection lifetime. Is intended to support real time applications requiring

Research and development , Research and Development  All intellectual ...

Research and Development  All intellectual activities consciously pursued and systematically completed generate useful information. Research (also Research and Development) is

ExtremeWhether.html, How to crete a web page name esp.html that allows user...

How to crete a web page name esp.html that allows users to conduct an ESP test

Output devices, Output devices: One of the most important output devic...

Output devices: One of the most important output devices in computer system is its screen commonly called monitor. It is an output device and displays all the programs and app

Define Multilevel Queue Scheduling?, • A multilevel queue scheduling algori...

• A multilevel queue scheduling algorithm divides the ready queue in several separate queues, for example • In a multilevel queue scheduling processes are lastingly assigned to one

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