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0478 SECTION 4: SOFTWARE - OS FUNCTIONS

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0478 SECTION 4: SOFTWARE - OS FUNCTIONS

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DESCRIPTION OF FEATURES OF AN OS.

Created by

Jonathan Dunsby
Jonathan Dunsby
Singapore

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0478 SECTION 4: SOFTWARE - OS FUNCTIONS
 

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0478 SECTION 4: SOFTWARE - OS FUNCTIONSOnline version

DESCRIPTION OF FEATURES OF AN OS.

by Jonathan Dunsby
1

User human Line form

The computer interface ( HCI ) is in the of a Command Interface ( CLI ) or a Graphical Interface ( GUI ) .

2

file instructions commands type

A CLI requires a user to in in order to choose options from menus , open software , etc . There are often a number of that need to be typed in , for example , to save or load a .

3

options direct slow learn operations commands restricted

For CLI , the user has to a number of commands just to carry out basic . It is also having to key in these every time an operation has to be carried out . However , the advantage of CLI is that the user is in communication with the computer and is not to a number of pre - determined .

4

load need type interact selecting icons

A GUI allows the user to with a computer using pictures or symbols ( ) rather than having to in a number of commands . Simply any of the icons from the screen would automatically the application into the phone ready to be used . There is no to type in anything .

5

cannot execution locations time incorrect lost accessible crash track primary placed protection

Memory management carries out the following functions :
» manages the storage ( RAM ) and allows data to be moved between RAM and HDD / SSD during the of programs
» keeps of all the memory
» carries out memory to ensure that two competing applications use the same memory locations at the same . If this wasn ? t done the following might happen :
? data would probably be
? applications could produce results ( based on the wrong data being in memory locations )
? potential security issues ( if data is in the wrong location , it might make it to other software , which would be a major security issue )
? in extreme cases , the computer could .

6

ensure data system management confidentiality

Security is another part of a typical operating ; the function of security management is to the integrity , and availability of . This can be achieved as follow s

7

anti firewall software privacy traffic available updates date

Security Management :

» by carrying out operating system as and when they become .
» ensuring that virus software ( and other security ) is always up to , preserving the integrity , security and of data .
» by communicating with , for example , a to check all to and from the computer .

8

user entering access accounts passwords privileges areas

Security Management :

» By making use of to prevent users ? private ? on a computer that permits multi - user activity ( this is done by setting up user and making use of and user IDs ) ; this helps to ensure the privacy of data
» By maintaining rights for all

9

recovery data ensuring restore corrupted prevent

Security Management : :

» by offering the ability for the of data ( and system ) when it has been lost or .
» by helping to illegal intrusion into the computer system ( also the privacy of ) .

10

data drivers understand Communicates require devices translates priority

Hardware management involves all input and output peripheral .

» with all input and output devices using device
» Uses a device driver to take from a file ( defined by the operating system ) and it into a format that the input / output device can
» Ensures each hardware resource has a so that they can be used and released as

11

memory files protection allocation structures tasks copy create naming locking

The main tasks of file management include :
» File conventions which can be used i . e . filename . docx
» Performing specific ( for example , , open , close , delete , rename , , and move )
» Maintaining the directory
» Ensuring access control mechanisms are maintained ( for example , access rights to , password , or making files available for editing or them )
» Ensuring memory for a file by reading it from the HDD / SSD and loading it into .

12

process multitasking processes share monitor one clash

Multitasking allows computers to carry out more than task ( i . e . a ) at a time . Each of the processes will the hardware resources under the control of the operating system software . To make sure that operates correctly ( in other words , the processes don ? t with each other ) , the operating system needs to constantly the status of each of the under its control :

13

time resources priority allocated risk running interrupted

Multitasking :

» Resources are to a process for a specific limit .
» The process can be while it is .
» The process is given a so it can have resources according to its priority ( the here is that a low priority process could be starved of ) .

 
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