Quoted text will have the quotation marks stripped. Only double quotation marks
are recognized. Multiple parts of text can be quoted, or text can be quoted entirely.
Trailing spaces are automatically stripped. If you need to keep trailing spaces you
need to quote them:
DX"2003 "
Table 21-2. Special characters allowed in macro text
Notation Placed in text
\b Backspace character
\f Formfeed character
\n Newline character
\r Carriage-return character
\\ Backslash character
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
21.3 Configuration-File Definitions | 789
Leading space characters are retained in text regardless of whether they are quoted.
Spaces are harmless, provided that the macro is used only in rules (because spaces
are token separators). If the macro is used to define other macros, problems can
arise. For example:
Dw ourhost
DH nlm.nih.gov
Dj $w.$H
Here, the text of the $w and $H macros is used to define the $j macro. The $j macro
is used in the HELO SMTP command and in the Message-ID: header line. The value
given to $j in this case is:
ourhost. nlm.nih.gov
?†‘ ?†‘
two a space
spaces
Here, the value of $j should contain a correctly formed, fully qualified domain name.
The unwanted spaces cause it to become incorrectly formed, which can cause mail to
fail.
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