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

Block diagram of digital computer, Block diagram of digital computer: ...

Block diagram of digital computer: The general pattern of computer architecture has remained unchanged over the last four decades or so. It has a single processor, which accep

What is atm, ATM = Asynchronous Transfer Mode Fast packet switching and mul...

ATM = Asynchronous Transfer Mode Fast packet switching and multiplexing technology (cell-based ) Support the universe of services voice, video and data traffic Provides quality of

Types of software interface, different types of software interfaces which f...

different types of software interfaces which falls in different categories

Opcode and operands, Opcode and operands: Let us further assume that o...

Opcode and operands: Let us further assume that our computer can process only two-digit decimal numbers, i.e. there can be a maximum of two operands each of a maximum of two d

Digital video disks, Digital Video Disks: DVD stands for Digital Video...

Digital Video Disks: DVD stands for Digital Video Disks or Digital Versatile Disks. A DVD stores much more data than a CD-ROM. Its capacities are 4.7GB, 8.5GB, and 20GB etc. T

Briefly explain the stage and the timeline, Question 1 Briefly explain the...

Question 1 Briefly explain the Stage and the Timeline Question 2 What is Device Central? How it is useful for previewing mobile content? Question 3 Which are the f

Discuss the objectives of query processing, Question 1 Differentiate betwe...

Question 1 Differentiate between PL/SQL functions and procedures Question 2 Draw the diagram of logical structure of oracle database and explain it in brief Question 3 D

Computational physiology, Estimate the mean deflection of the QRS complex i...

Estimate the mean deflection of the QRS complex in each of the six standard leads (I, II, III, aVR, aVL, aVF) in Figure 1 and then estimate the mean heart vector for the normal hea

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