Each MS-DOS command is either internal or external. Internal commands are commands that are built into MS-DOS and can be used at any time once MS-DOS is loaded into memory External commands are stored on your system diskettes as program files. To run an external command, MS-DOS must be able to locate the file from your system diskette or from a directory on the hard disk. This may require you to use the command’s path name when you enter the command.

See your MS-DOS manual for more information on the command format. Also see your MS-DOS manual for command descriptions that tell you which parameters and delimiters are required for each command and which optional parameters and switches you can use.

Entering MS-DOS Commands

You can enter an MS-DOS command whenever you see the MS-DOS command prompt. Type the command name and any necessary parameters and delimiters and then press Enter to execute the command. You can type command names and parameters in either uppercase or lowercase letters.

If you make a mistake when typing a command and you notice it before you press Enter, you can do one of two things:

Use the backspace key to back up and correct the error

Press ESC and then Enter to cancel the command line.

If you press Enter when a command line has an error in it, the screen displays an error message. Usually, the command prompt reappears so you can try again. Type the correct command and press Enter.

Storing Data

All your work and programs are stored in files on your diskettes or hard disk. A data file contains information, such as words, numbers, or pictures. A program file contains instructions that the computer can understand and execute.

The kind of file you create depends on the MS-DOS command or application program you use to create it. In general, a data file that you

Using MS-DOS with Your Equity Ie

4-3