This might be okay, but it does destroy your original data. In this example, then, you would probably want to furnish both input and output coverage names, even if both are not required. Just keep in mind that with most commands, the more parameters you furnish, the more you can control how the command works. In the other options you can choose a variety of values. Say you wanted to furnish an optional parameter but skip an earlier one.
Some commands require several parameters.
Try typing COPY at the prompt. This command copies a coverage from one name to a new coverage with a different name. This command has no other required or optional commands. The usage statement gives you brief information on the parameters for a command, but you might need more information. You'll see a message about ArcDoc starting and the Arc prompt will return.