Empty Commands Go to the first , previous , next , last section, table of contents .
It is sometimes useful to define commands which do nothing. This is done simply by giving a command that consists of nothing but whitespace. You could also use a line beginning with a tab character to define an empty command string, but this would be confusing because such a line looks empty. You may be wondering why you would want to define a command string that does nothing. You may be inclined to define empty command strings for targets that are not actual files, but only exist so that their dependencies can be remade.