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The following steps demonstrate how to use the keyboard to run commands and view and select options. If Dynamic Input is toggled on, press F12 to turn it off — temporarily, at least. Follow these steps to work with the command line:

1 Type L and then press Enter.AutoCAD starts the Line command and displays the following prompt in the command line:LINE Specify first point:

2 Click a point anywhere in the drawing area.The command line prompt changes toLINE Specify next point or [Undo]:

3 Click another point anywhere in the drawing area.AutoCAD draws the first line segment.

4 Click a third point anywhere in the drawing area.AutoCAD draws the second line segment and prompts you:LINE Specify next point or [Close Undo]:

5 To activate the Undo option, type U and press Enter.You can type the option letter in lowercase or uppercase.AutoCAD undoes the second line segment.If you type an option that the command line doesn’t recognize (for example, X isn’t a valid option for the Line command), the command line displays an error message and prompts you again for another point — in this case, a point for the Line command:Point or option keyword required.Specify next point or [Undo]:Option keyword is programmer jargon for letters, shown in uppercase, that activate a command option. This error message is AutoCAD’s way of saying, “Huh? I don’t understand what you mean by typing X. Either specify a point or type a letter that I do understand.”