Functions of an Operating System:

1.      Resource Allocation and Scheduling

2.      Memory Management

3.      Backing-store management

4.      Input/Output Control

5.      Interrupt Handling (Errors Handling)

6.      Operator interface (Accepts commands and responds to them)

7.      Security (assign login codes and passwords to users)

8.      Accounting Facilities (no. of printed pages, disk space used etc)

9.      Utilities