-@: Display the control-code mappings

This option supplies information about the @ control codes (see AT commands). It shows the associated style-file parameters that can be used to remap the codes (but don't do that!), and it displays the precedence. (Some codes such as @@ may be used anywhere; others such as @* begin a new section or part of section. Codes that begin the definition part are labelled by [D]; codes that begin the code part are labelled by [C]; codes that begin a new section are labelled by [S].)

The option produces two columns of output: the first is sorted numerically, the second alphabetically. The notation USED_BY_OTHER means that this command is ignored by whatever processor (FTANGLE or FWEAVE) is currently being run, but may be used by the other processor. (For technical reasons, a very few commands such as @i do not show up in this output at present.)

If one says just -@, information about all control codes is produced. Selected control codes may be queried by listing them after the -@. For example, to learn about the commands @~ and @a, say -@~a. Remember to quote certain characters on UNIX systems--e.g., -@'*?'. If a command is used by neither processor, its description will be replaced by a question mark.