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Linux Network Administrator Guide, Second EditionAction items appear between service specifications, and are enclosed within square brackets, []. The general syntax of the action statement is: [[!] status = action] There are two possible actions: return Controls returns to the program that attempted the name resolution. If a lookup attempt was successful, the resolver will return with the details, otherwise it will return a zero result. continue The resolver will move on to the next service in the list and attempt resolution using it. The optional (!) character specifies that the status value should be inverted before testing; that is, it means "not." The available status values on which we can act are: success The requested entry was found without error. The default action for this status is return. notfound There was no error in the lookup, but the target host or network could not be found. The default action for this status is continue. unavail The service queried was unavailable. This could mean that the hosts or networks file was unreadable for the files service or that a name server or NIS server did not respond for the dns or nis services ...» |
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