Introduction
- An Operating System is a program that manages the computer hardware.
- It also provides a basis for application programs and acts as an intermediary between the computer user and the computer hardware.
- various operating systems are designed to accomplish various tasks :
- mainframe operating systems - to optimize utilization of hardware
- personal computer operating systems - support complex games, business application, and everything in between
- that is, operating systems are designed to be
- convenient or
- efficient or
- combination of the both
- components of computer system are :
- hardwarec. - CPU, memory, I/O devices etc.
- operating system
- application programs - like, word processors, spreadsheets, compilers, web browsers etc
- users
"The Operating System (OS) controls and coordinates the use of the hardware among the various application programs for the various users."
Role of Operating Systems
We can explore the OS from two view points
- User View
- System View
User View
- user interface
- program execution
- IO operations
- File system manipulation
- error detection
- communication
System View
- resource management
- protection & security
- accounting
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