Conventions
This book uses the following typographical conventions:
- italic
Is used for the names of files, directories, hostnames, domain names, and URLs, and to emphasize new terms when they are first introduced.
-
constant-width Is used to show the contents of files, command syntax, and the output from commands.
-
constant-italic Is used in examples to show variables for which a context-specific substitution should be made. (The variable
filename, for example, would be replaced by some actual filename.)- [ option ]
When showing command syntax, we place optional parts of the command within brackets. For example,
ls [-l]means that the-loption is not required.
Tip
This is an example of a Note. Notes are short asides that convey supplemental information that may not be important to all readers.
Warning
This is an example of a Warning. Warnings highlight dangerous procedures—those that may damage you, your hardware, or your data. Disregard warnings at your own peril.