DOS is a command line user interface first introduced in 1981 for IBM computers. Last updated in 1994 when MS-DOS 6.22 was released.

Although MS-DOS is not commonly used today, the command shell used in Microsoft Windows.

To start DOS click start > run > type cmd and enter. In the window enter following commands.

dir

Dir - shows display directory information
help - DOS help

help dir - help for dir command

you can add several commands in to a .bat file and run it.