www.Padasalai.Net 4. OPERATING SYSTEM DONE BY DINESH.A

TYPES OF SOFTWARE System Sofware (Predefined) Application Software (Extra Application) Eg : Ms.off, Photoshop,etc.,

INTRODUCTION TO OS OS – Operating system It is an mediator (Interface) User and sytem.

Popular OS System OS MOBILE OS WINDOWS 1)ANDROID 2) LINUX 2) IOS 3)UNIX MOBILE OS 1)ANDROID 2) IOS

Need for operating System Ensure & Extract Esy Interaction Booting Controlling Input/Output Devices Mange the Utilization of Main Memory Security

Types of OS Single User Multi User Only a single User to perform a task at a time. To Accessed by a Multiple Users at a time.

Key Features of OS. User Interface File Management Memory Management Fault Management Process Management Security Management

1) USER INTERFACE GUI LINUX Graphical User Interface. Available GUI Based Distribution.

Process of controlling & coordinating computer Main Memory 2)MEMORY MANAGEMENT Os Response For Portion of Memory Data Move Allocation of Memory Process of controlling & coordinating computer Main Memory

3) Process Management Collection Process Communicate & Synchronize Unit of work (Program) in a Computer Collection Process OS – Executed by System Code User process by User code

Algorithms of the Process FIFO (First In First Out) SJF (Shortest Job First) ROUND ROBIN BASED ON PRIORITY

1) FIFO (First In First Out) Queuing Technique

2) SJF (Shortest Job First) Based on the size of the Job

3) Round Robin (RRS) Time sharing system Jobs are assigned and processor time in a circular method

4) Based on priority The given job (Process) is assigned based on a priority Higher priority is more Important then other Jobs

4) Security Management Major challenge in Software industry To Product User’s legitimate data from hackers. Three Level of securities Fill Access Level System Level Network Level

5) Fault Tolerance OS should be “Robust” FaultCrash Fault Tolerance Capabilities

6) File Management Important Function OS Manages the files, folders and directory systems on a computer FATFile Allocation Table NTFSNext Generation File System

7) Multiprocess Parallel Two are more processors at a some time to be Executed.

8) Time-Sharing To Execute Multiple tasks (or) Processes concurrently Each task a fixed time Allocation

9) Distributes OS Stored and processed on Multiple physical locations Access through the Internet. Advantages: Data Sharing Multiprocess Improves the Interaction Reduces the Loading

Prominent OS UNIX Microsoft Windows LINUX IOS Android

Various Operating System Windows LINUX Red Hat Mac OS Free BSD Solaries Sun Cobalt

1) UNIX Multitasking OS 1970Ken thompson & Dennis Ritchie.

2) LINUX Open source OS Easy to customize Various versions and Updates.

LINUX FEDERA UBUNTU BOSS LINUX MINT RED HAT.

3) MICROSOFT WINDOWS Developed Microsoft coporation (Intel&AMD)

Os for Mobiles Devices Apple ios Google Android

1) Android OS Developed by Google Touch Mobile, Smart phone, Tablet, Smart Tv, etc.

Versions AAlpha BBeta LLollipop O Oreo K KitKat NMougat

2)ios (iphone OS) Developed by Apple Iphone Mobile devices,ipad touch 2nd most popular OS.

Windows Version 1985Windows 1.0 1990 Windows 3.2 1995 Windows 95 2001 Windows XP 2006 Windows Vista 2009 Windows 7 2012 Windows 8 2015 Windows 10

Elthampuravadai (Vill) Thank You Done by Dinesh.A Moblie No.9025226740 Elthampuravadai (Vill) Kilpennathur post Thiruvannamalai Dt.

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