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

Discuss the roles of system analysts in detail, Question 1 Explain the ...

Question 1 Explain the following system design tools in detail System Flowcharts Decision tables Decision trees Organization charts Question 2 Write s

Fms control-display unit, FMS CONTROL-DISPLAY UNIT: The CDU provides a ...

FMS CONTROL-DISPLAY UNIT: The CDU provides a means for the crew to communicate with the FMC.  It contains pushbutton key controllers and a display screen.  The keys are of two

Theory of computation, If L is a regular language show that L U {a} is regu...

If L is a regular language show that L U {a} is regular

Opening documents situated on different computers - network, Opening Docume...

Opening Documents Situated on Different Computers In order to work with documents situated on other computers, you need sufficient rights to access the folder in which it is

Principal structures in flow charting, PRINCIPAL STRUCTURES IN FLOW CHARTIN...

PRINCIPAL STRUCTURES IN FLOW CHARTING Structured programing calls for the usage of four principal structures to help simplify the program. They are:     Sequential contro

Mini computers and micro computers, Mini Computers and Micro Computers: ...

Mini Computers and Micro Computers: The mini computers are intermediate in power, and may function as small mainframe computers. They are often dedicated to a particular purpo

Liquid crystal displays, Liquid Crystal Displays (LCD): First introduc...

Liquid Crystal Displays (LCD): First introduced in watches and clocks in the1970's, LCDs are now used to display images in monitors. A newer technology in computer screens is

Discuss the attributes of speech codec, Question 1 What is mobile telephon...

Question 1 What is mobile telephone initialization? Explain the three main goals of this procedure Define GSM system operations Introduction to mobile telephone initializ

Wcdma – fdd technology, WCDMA – FDD technology Multiple access technology i...

WCDMA – FDD technology Multiple access technology is wideband CDMA (WCDMA) All cells at same carrier frequency Spreading codes used to separate cells and users Signal bandwidth 3.8

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