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

Explain the basic structure of a c program, Question 1 Explain the basic...

Question 1 Explain the basic structure of a C program with an example 2 What would be the value of x after execution of the following statements? 3.What are the commonly u

The gigo principle, The GIGO Principle : This is a simple principle with a...

The GIGO Principle : This is a simple principle with a clear message and universal application - Garbage In - Garbage out! Always try and enter any data in the form you want to

Artificial intelligence agents, Artificial Intelligence Agents In the ea...

Artificial Intelligence Agents In the earlier teach, we discussed what we will be talking about in Artificial Intelligence and why those tasks are important. This lecture is all

Data structures, let me know if you can do this assignment and how long it ...

let me know if you can do this assignment and how long it takes

Necessary nurses records, Necessary Nurses Records The software shoul...

Necessary Nurses Records The software should generate all registers/reports in detail summary for various permutations and combinations of options. A powerful SQL (Structure

Computers in laboratory organisation and management, Computers can be used ...

Computers can be used for better and more efficient management and organisation of laboratories. A computer like the human brain receives information, stores and processes it and t

Paper system, Paper System : When setting up a computer system you need to...

Paper System : When setting up a computer system you need to ask yourself 'Does the system you plan to operate work manually, i.e., on paper?' It is a popular misconception that t

Input - output services, Input/Output Services:   Every operating syst...

Input/Output Services:   Every operating system, large or small, provides input/output services for each device in the system. The operating system includes I/O device driver

Simulated annealing-artificial intelligence, Simulated Annealing One wa...

Simulated Annealing One way to answer the problem of local maxima and related problems like ridges and plateaux in hill climbing is to permit the agent to go downhill to some e

Multiple Statement Groups as Suites, Sets of individual statements making u...

Sets of individual statements making up a single code block are known as suites in Python. Composite or complex statements for example if, def while and class are those which neces

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