| Italic | is used for UNIX filenames, commands not built into the shell (which are files anyway), and shell functions. Italic is also used for dummy parameters that should be replaced with an actual value, to distinguish the vi and emacs programs from their bash modes, and to highlight special terms the first time they are defined. |
| Bold | is used for bash built-in commands, aliases, variables, and options, as well as command lines when they are within regular text. Bold is used for all elements typed in by the user within regular text. |
| Constant Width | is used in examples to show the contents of files or the output from commands. |
| Constant Bold | is used in examples to show interaction between the user and the shell; any text the user types in is shown in Constant Bold. For example:$ pwd/home/cam/adventure/carrol $ |
| Constant Italic | is used in displayed command lines for dummy parameters that should be replaced with an actual value. |
| Reverse Video | is used in Chapter 2, to show the position of the cursor on the command line being edited. For example:grep -l Alice < ~cam/book/[[a]]iw |
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