1.Introduction To Operating System

A program that acts as an intermediary between a user and the computer hardware

An operating system, or OS, is a software program that enables the computer hardware to communicate and operate with the computer software. Without a computer operating system, a computer would be useless

Operating systems can also be considered to be managers of the resources. An operating system determines which computer resources will be utilized for solving which problem and the order in which they will be used

Software controlling the overall operation of a multipurpose computer system, including such tasks as memory allocation, input and output distribution, interrupt processing, and job scheduling

1.1 Understand Terms and Concepts of Operating System

Batch Systems: No User Interaction

Batch System
Multi-Programming: Multiple Programs Loaded in Memory

Multi-Programming
Time-sharing: each process receives slices of CPU time

Time Sharing
Interactive systems: provides quick response to user’s actions

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Multi-user: distinction between users

Multi User
Network OS: users aware of the existence of multiple computers

Network
Distributed OS: looks like a traditional single-processor system

Distributed
Processes, Files, System Calls

File

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