Practical No.9


What is Operating System

An operating system consist of integrated program that act links between the user and machine.

Types of Operating System

  1. Single User Single Tasking
  2. Single User Multitasking
  3. Multi User Multi Tasking

Names Of Computer Operating System

  1. DOS (Disk operating System)
  2. Windows/WindowsXP/window NT/Window7/8
  3. Unix/Xenix
  4. Linux
  5. OS2/OS4

DOS (Disk Operating System)

Dos is use to single user and single tasking operating system it is use to operate the computer, this operating system consist of command line interfacing. Every operating system has three basic primary function, one is operate and control hardware’s second is file management and third run a program.

There are two type of commands.

  1. Internal Commands
  2. External Commands

Internal Commands

Internal command move to RAM/Computer Memory from disk at booting time.

   1) CLS      2)DATE     3) TIME     4) VER   5) VOL   6) DIR   7) TYPE  
   8) COPY     9) REN    10) DEL     11) MD   12) RD   12) CD   13) PAUSE