| bold |
Bold type is used for keywords—for example, the names of commands and of structures and their fields. These names are spelled exactly as they should appear in source programs. |
| italic |
Italic type is used to indicate the name of an argument; this name must be replaced by an actual argument. Italic type is also used to show emphasis in text. |
| monospace |
Monospace type is used for syntax and code examples that are provided to illustrate system calls and to show the format of data structures. |
| FULL CAPITALS |
Full capital letters are used for filenames and paths, structure names, and constants. |
| SMALL CAPITALS |
Small capital letters are used for the names of keys and key combinations. |