OPERATING SYSTEM UNIT 2 OPERATING SYSTEM Structure 2.0 Introduction2.1 Objectives2.2 The Concept of an Operating System 2.3 OPERATING SYSTEM SERVICES 2.3.1 Command Processor and User Interface 2.3.2 File Management 2.3.3 Input/Output Services 2.3.4 Process Control Management 2.3.5 Memory Management2.4 A Bit of History