1. OPERATING SYSTEM BASICS

4. What is an operating system and what does it do? The operating system has two basic functions: –communicates with the PC ’ s hardware gives applications access to things like the hard drive receives input from the keyboard, and it outputs data to the monitor. –provides a user interface and interprets commands so a user can communicate with the hardware. File management

5. Operating systems are responsible for Program execution: – The user χρήστης asks the operating system to execute a specific program – The OS handles all necessary tasks so the result reaches the user Input/Output functions: – Communication with I/O devices

6. Operating systems are responsible for File system management: – Create, delete, rename files, etc. Error detection Resource allocation Logistics: – Keeps statistics στοιχείων to improve performance Security

8. Microsoft Windows

9. Linux

10. Linux vs. Windows 1.Open Source - Free and commercial versions 2.Faster and has lower requirements 3.Transparent operation 4.In rapid development 5.True Multi-Tasking (supports multiple processors) 6.GUI is not part of the kernel 7.Less user-friendly than Windows (command line and shell scripts) 8.Linux is case-sensitive