DOS is Stands for " Disk Operating System". DOS was the first  “Operating System ” that is used by “ IBM- Compatible”  Computers.

PC-DOS was the version developed by IBM and sold it to the first IBM-Compatible Manufacturers. "MS-DOS" was the version that Microsoft bought the rights to and was bundled with the first versions of Windows. We can implement the different types of commands which are given below.

§         Inter Commands

§         External Commands

Inter Commands:

Internal Commands are  reside in COMMAND.COM, which loads into memory when the computer system is started these commands do not reside on disk.

External Commands:

External Commands are files that do reside on disk and have an extension of .COM, .EXE, or .BAT. Both command types are executed from the MS-DOS prompt.

Internal Commands:

Below is some internal commands and its functionality is as fallow.

How to start Command Prompt.

 Click on the start button and then select the “run” option from here  a run window will be appeared as given  below.

 Enter the following text “ CMD” in  text box then press enter key a screen will be appeared as given below.

CD:

Stand for changed directory. Directory mean folder

We can use it in follwing ways .  

 cd..     “ press enter key ” 

It move out from one directory to “ Document and settings”. Result is given below.

Other way to use command is as cd\ it will move out all directories  as given below

Then result will be as

Next material is posted soon
Muhammad Shafique MCS