Computer Science UGC Net

"An Operating System is an interface between the computer user and the computer hardware". An operating system is an program that manages the computer hardware.Basically, a computer system can be divided roughly into four components the hardware the operating system the application programs and the users. It controls and coordinate the use of hardware among the various application programs for various users. We have various operating systems available. Some popular operating system are: Linux, Unix, windows operating system which is mostly used these days, MAC operating system (specifically used by "apple"). Main Functions of Operating System: 1. Process management 2. Main Memory management 3. File management 4. Input/Output management 5. Secondary storage management Process Management: A program is a passive entity such as content of a file stored in disk, whereas a process is an active entity, with a program counter specifying the ne