ICTIGCSE Theory– RevisionPresentation

1.3Operatingsystems
• Define and describe operating systems which contain a Command Line Interface
(CLI)
• Define and describe operating systems which contain a Graphical User Interface
(GUI)
• Describe the differences, including the benefits and drawbacks, between operating
systems which contain a CLI and those which contain a GUI

Chapter1:Typesandcomponentsofcomputersystems
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 ICTIGCSE Theory– RevisionPresentation
1.3Operatingsystems
Role of an Operating System

Anoperatingsystemisasystemsoftware thatmanages thegeneraloperationofa

computersystem:
Allowsusersto
Providessecurity
load,runand
andprevents
storeapplications.
unauthorised
Alsoresolveerrors
accesstoasystem
occurring
applications
Helpstheuser
interactwiththe Roleofan Decidedwhat
computerthrougha operatingSystem shouldbeloaded
userinterface. anddeletedfrom
memory

Helpingsave,
organise,findand Managesinput,
deletefiles outputandbacking

Chapter1:Typesandcomponentsofcomputersystems
devices.
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1.3Operatingsystems
Example GUI Operating Systems

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 ICTIGCSE Theory– RevisionPresentation
1.3Operatingsystems
GraphicalUserInterface(GUI)

GUI(GraphicalUserInterface)isanuserinterfacebuiltaroundgraphics.

Windows – areas Menus Ͳ listsof

fordisplaying optionsor
information applicationsusers
canselectfrom

GUI
IconsͲsmallimages Pointers –Mouse
usedtorepresent pointercanbeused
files/foldersor toselectandopen
applications files/applications

• GUIs arequiteeasytouse duetothevisualnatureof

theinterface

Chapter1:Typesandcomponentsofcomputersystems
• Theuserhaslotsofvisualcluesastowhatthingsdo.

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1.3Operatingsystems
GraphicalUserInterface(GUI)Examples

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 ICTIGCSE Theory– RevisionPresentation
1.3Operatingsystems
CommandLineInterface(CLI)

• CLI requirestheusertoentercommandpromptstointeractwiththe
computer.
• CLI arenormallyusedbyexpertusersasitallowsthemtoismore
complicatedtouse.
• CLIandisnotrestrictedtoanumberofpredeterminedoptions.

ExampleCommandPrompts

ATTRIB:Displaysorchangesfileattributes.
CD:Displaysthenameofcurrentdirectory
CHKDSK:Checksadiskanddisplaysastatus
report
Copy:Copiesoneormorefilestoanother
location
DIR:Displaysalistoffilesandsub
directories

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 ICTIGCSE Theory– RevisionPresentation
1.3Operatingsystems
MainDifferencesbetweenCLIandGUI

Graphical User Interface (GUI)

Advantages:
• Theuserdoesnotneedtolearnanycommands.
• Theinterfaceiseasiertouse.
• Canuseapointingdevice toclicksandselecticonsormenuoptions.
Disadvantages:
• TakesupmorememorythanaCLIinterface.
• Requiresanoperatingsystemtooperate.
Command Line Interface (CLI)
Advantages:
• Theuserhasmorefreedomtousespecificcommandininteracting
withthecomputer.
• Itispossibletoaltercomputersettings.
Disadvantages:
• Userneedstolearncommands
• Commandsmustbetypedinwithouterrors.

Chapter1:Typesandcomponentsofcomputersystems
• Novisualaids.

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