The following typographic conventions are used in this book:
Used for names, including pathnames, filenames, program and command
names, usernames, hostnames, machine names, and mailing-list names,
as well as for mail addresses. Italics are also used to indicate that
part of a program’s output is not specific. For
example, "error
: number or file" indicates that the error will be
shown either as a number or as a filename. In addition, italics are
used to emphasize new terms and concepts when they are introduced.
Constant Width
Used in examples to show the contents of files or the output from
commands. This includes examples from the configuration file, or
other files, such as message files, shell scripts, or C-language
program source. Constant-width text is quoted only when it is
necessary to show enclosed space; such as, the five-character
"From
" header.
Single characters, symbolic expressions, and command-line switches
are always shown in constant-width font. For instance, the
o
option illustrates a single character, the rule
$-
illustrates a symbolic expression, and
-d
illustrates a command-line switch.
Constant Width Italic
Used in examples and text to show variables for which a
context-specific substitution should be made. (The variable
filename
, for example, would be replaced
by some actual filename.)
Constant Bold
Used in examples to show commands or other text that is to be typed
literally by the user. For example, the phrase cat/var/run/sendmail.pid
means the user should type
“cat /var/run/sendmail.pid” exactly
as it appears in the text or example.
Placed with section cross references to indicate whether the cross reference is referring to the sendmail 8.13 Companion ([V8.13]) or sendmail, Third Edition ([3ed]).
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