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This book uses certain typographical conventions to help convey information clearly and concisely.
Double quotes ("") are used to indicate an unusual meaning for a common word, such as "bounce."
Italics are used to introduce new terms, like injection, or simply for emphasis. Italics are also used to indicate variables, like /user/ for a user name or /concurrencylocal/ for a configuration setting.
Text that appears in a fixed-width typeface, such as qmail-send or <kayleigh@example.com>, represents a filename, command name, username, e-mail address, domain name, code sample, or Uniform Resource Locator (URL).
A directive to run a single command that should not produce any output looks like:
touch .qmail
If a command must be performed by the superuser (UID 0), the hash (#) shell prompt is used:
# touch /var/qmail/alias/.qmail-root
If a command should be performed by a non-privileged user, the dollar sign ($) shell prompt is used:
$ touch .qmail
If an example mixes user input and command output, user input is printed in bold:
$ date Sat May 5 07:06:49 EDT 2001 $
Note | Examples that include output end with a line consisting solely of the shell prompt ($) to show that the output included is complete. |
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