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Linux Network Administrator Guide, Second EditionA Simple Rule Pattern Example To better see how the macro substitution patterns operate, consider the following rule lefthand side: $* $+ This rule matches "Zero or more tokens, followed by the character, followed by one or more tokens, followed by the character." If this rule were applied to brewer@vbrew.com or Head Brewer , the rule would not match. The first string would not match because it does not include a character, and the second would fail because $+ matches one or more tokens and there are no tokens between the characters. In any case in which a rule does not match, the righthand side of the rule is not used. If the rule were applied to Head Brewer brewer@vbrew.com , the rule would match, and on the righthand side $1 would be substituted with Head Brewer and $2 would be substituted with brewer@vbrew.com. If the rule were applied to brewer@vbrew.com the rule would match because $* matches zero or more tokens, and on the righthand side $1 would be substituted with the empty string. Ruleset Semantics Each of the sendmail rulesets is called upon to perform a different task in mail processing ...» |
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