CertiGuide to A+ (Operating Systems) - DOS Prompt CDI Interface

Users are required to type in the exact format of the command expected by the Operating System, which means that it's difficult to walk up to a command-driven interface for a new type of Operating System, and accomplish anything productive without a bit of study beforehand. The other side of this is that once you do master using an OS from the command line, you can often be more productive than you would be if you limited yourself to the GUI.

In general, a CDI also requires that user be fairly familiar with keyboard use, in order to be productive. And if your fingers slip and you type one character incorrectly, the Operating System is likely to respond with an error message like, "Bad command or file name" or "File does not exist", and you'll have to type the command again.

**Figure 4: Windows MS-DOS Prompt with Command Errors**

Command-Driven Interface (CDI)

Graphical User Interface

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Version 1.0 - Version Date: January 7, 2005

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