2. CONTENTS:
➢What is an Operating System
➢Functions of Operating System
➢Types of Operating System
➢Examples of Operating System
➢Conclusion
3. What is an Operating System?
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A modern computer consist of:
One or more processors
Memory
Disks
Printers
Various input/output devices
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M a n a gi n g all these varied components requires a layer of
software – the Operating System
The Operating System is the most important program that runs
on a computer.
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An operating system is a powerful, and usually large,
program that controls and m an ages the hardware and
other software on a computer.
An operating system is actually a software, which makes
a computer to actually work, enables all the programs we
use and makes the computer more convenient to use.
It provide a pleasant and effective interface between the
user and the hardware.
Without an operating system, a computer is useless.
5. FUNCTIONS OF OPERATING S Y S T E M
➢ Process Management
➢ Memory Management
➢ File Management
➢ Security Management
➢ Command Interpreter
6. 1. PRO CESS M A N A G E M E N T
- By process management O S ma na ges many
kinds of activities:
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All process from start to shut down.
Creation and deletion of user and system
processes.
7. 2. M E M O R Y M A N A G E M E N T
- The major activities of an operating regard to
memory management are:
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• Decide which process are loaded into
memory when memory space becomes
available.
Allocate and deallocate memory space a s
needed.
8. 3. FILE M A N A G E M E N T
- The file management system allows user to
perform tasks such as:
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Creating files and directories
Renaming files
Coping and moving files
Deleting files
9. 4. SECURITY M A N A G E M E N T
- By security management O S ma na ges many
tasks such as:
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Alert messa ges
Dialogue boxes
Firewall
Passwords
10. 5. C O M M A N D INTERPRETER
- A command interpreter is an interface between system
and the user. There are two types of user interface:
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Command line
Graphical user interface
-With a command line user interface the user interact with
O S by typing command to perform specific tasks.
-With a graphical user interface the user interacts with the
O S by using a mouse to access windows icons and menus.
11. TYPES OF OPERATING S Y S T E M
➢ Multi-user
➢ Multi-processing
➢ Multi-tasking
➢ Multi-threading
➢ Embedded System
12. MULTI-USER
-A multi-user operating system allows for multiple user to
use the sam e computer at the same time and different
times. Examples of Multi-user O S are: Linux, Unix,
Windows 2000.
MULTI-PROCESSING
-A multi-processing operating system is capable of
supporting and utilizing more than one computer
processor. Examples of Multi-processing O S are: Linux,
Unix, Windows XP.
13. MULTI-TASKING
-A multi-tasking operating system is capable of allowing
multiple software processes to run at the same time.
Examples of Multi-tasking O S are: Linux, Unix, Windows 7.
MULTI-THREADING
-A multi-processing operating systems allows different
parts of a software program to run concurrently .
Examples of Multi-threading O S are: Linux, Unix, Windows
XP.
14. E M B E D D E D S Y S T E M
-The embedded operating system are designed
to operate on small machines like PDA’s with
less autonomy. They are very compact and
extremely efficient by design. Windows CE and
Minix 3 are some examples of embedded
operating systems.
15. E XA M PLE S OF OPERATING S Y S T E M S
-Examples of modern operating systems
include Android, Linux, iOS, Microsoft
Windows, Windows mobile, Blackberry.
16. Conclusion
-As Operating System controls and coordinates
the use of the hardware a mong various
applications programs for various uses, we can
say that it plays a very important role in
computer system. Without an operating system,
a computer is useless.
