$: ?§18.7.2 on page 662 Rewrite once (when used as a prefix), or specify the user in a delivery agent ???triple,??? or
specify the default value to return on a failed database-map lookup.
$@ ?§18.7.3 on page 664 Rewrite and return (when used as a prefix), or specify the host in a delivery-agent ???triple,???
or specify an argument to pass in a database-map lookup or action.
$>set ?§18.7.4 on page 664 Rewrite through another rule set (such as a subroutine call that returns to the current
position).
$# ?§18.7.5 on page 667 Specify a delivery agent or choose an action, such as to reject or discard a recipient,
sender, connection, or message.
$[ $] ?§18.7.6 on page 668 Canonicalize the hostname.
$( $) ?§23.4 on page 892 Perform a lookup in an external database, file, or network service, or perform a change
(such as dequoting), or store a value into a macro.
$& ?§21.5.3 on page 793 Delay conversion of a macro until runtime.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
662 | Chapter 18: The R (Rules) Configuration Command
Not all LHS operators need to be referenced witha $digit in the RHS. Consider the
following:
R $* < $* > $* <$2>
Here, only the middle LHS operator (the second one) is required to rewrite the workspace.
So, only the $2 is needed in the RHS ($1 and $3 are not needed and are not
present in the RHS).
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