All examples presented in this book assume you are using a
sh compatible shell. The bash shell
is sh compatible and is the standard shell of all Linux
distributions. If you happen to be a csh user, you will
have to make appropriate adjustments.
The following is a list of the typographical conventions
used in this book:
Italic
Used for file and directory names,
program and command names, command-line options, email addresses and
pathnames, URLs, and for emphasizing new terms.
Boldface
Used for machine names, hostnames, site names, usernames and IDs, and for occasional emphasis.
Constant Width
Used in examples to show the contents of
code files or the output from commands and to indicate environment
variables and keywords that appear in code.
Constant Width Italic
Used to indicate variable options, keywords, or text that the user is to
replace with an actual value.
Constant Width Bold
Used in examples to show commands or other text that should be typed
literally by the user.
Warning
Text appearing in this manner offers a warning. You can make a
mistake here that hurts your system or is hard to recover from.
