Operating Systems (OS)

Operating Systems (OS)

1. Main Job

   • Acts as a bridge between user and hardware

2. Definition and Purpose

   • Manages hardware and software
   • Facilitates multitasking

3. Security Role

   • File protection
   • Access control

4. Types

   • Mobile OS (e.g., Android)
   • Desktop OS (e.g., Linux)

5. Multitasking and Task Management

   • Running multiple apps simultaneously
   • Resource allocation by the OS

6. Graphical User Interface (GUI)

   • Icons and pictures for user interaction
   • Desktop and Start Menu
   • Task Execution using visuals (e.g., buttons)

7. Command-Line Interface (CLI)

   • Text-based control for advanced tasks

8. Security Analyst Role

   • Setting up firewalls
   • Security rules and configurations

9. Hardware Managemen

   • CPU, memory, and other physical components managed by OS

10. Binary Language

    • OS translates user commands into binary (0s and 1s)

11. Early Computers vs. Modern Computers

    • Early: Single program execution
    • Modern: Multitasking capabilities

12. Linux

    • Popular in security due to flexibility and power

13. Programming Concepts

    • Function
      • Reusable code blocks for specific tasks