1. Operating System Type of Operating System
An operating system consist of integrated program that act links between the user or machine.
Type of Operating System
Single user single tasking
Multi user Single Tasking
Multi user and multi tasking

2. Name Of Some Operating System
DOS (Disk operating System)
Windows/Windows XP/window NT/Window7/8
Unix/Xenix
Linux
OS2/OS4
Type of Operating System
Single user single tasking
Multi user Single Tasking
Multi user and multi tasking

3. 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.
Internal Command
External Commands

4. Internal Command
Internal command move to RAM/Computer Memory from disk at booting time.
CLS
Date
Time
Ver
Vol
Dir
Type
Copy
Rename/Ren
Md/Mkdir
Rd/Rmdir
Cd/chdir

6. Syntax Example CLS : This command is use to clear the screen CLS
C:\> CLS
DATE :This command is use to display and set system date.
Date
C:\> DATE
TIME : This command is use to display and set system time
TIME
C:\> TIME

7. VER : This command is use to display version of operating system.
Syntax
VER
Example
C:\> VER
DIR : This command is use to Display files and folder/ sub directory
DIR /a/p/w [drive:\pathname\filename]
C:\> DIR/P
C:\> DIR/W/P d:
C:\> DIR/W/P d:*.txt