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.Most of these messages perform their action automatically at the time the article is processed by C Newswithout notifying the newsmaster.By default, only checkgroups messages will be handed to thenewsmaster, but you may change this by editing the scripts.The cancel MessageThe most widely known message is cancel, with which a user can cancel an article sent earlier.Thiseffectively removes the article from the spool directories, if it exists.The cancel message is forwarded toall sites that receive news from the groups affected, regardless of whether the article has been seenalready.This takes into account the possibility that the original article has been delayed over thecancellation message.Some news systems allow users to cancel other people's messages; this is, ofcourse, a definite no-no.newgroup and rmgroupTwo messages dealing with creation or removal of newsgroups are the newgroup and rmgroup messages.Newsgroups below the usual hierarchies may be created only after a discussion and voting has beenheld among Usenet readers.The rules applying to the alt hierarchy allow for something close to anarchy.For more information, see the regular postings in news.announce.newusers andnews.announce.newgroups.Never send a newgroup or rmgroup message yourself unless you definitelyknow that you are allowed to.The checkgroups Messagecheckgroups messages are sent by news administrators to make all sites within a network synchronizetheir active files with the realities of Usenet.For example, commercial Internet Service Providersmight send out such a message to their customers' sites.Once a month, the official checkgroupsmessage for the major hierarchies is posted to comp.announce.newgroups by its moderator.However, itis posted as an ordinary article, not as a control message.To perform the checkgroups operation, savethis article to a file, say /tmp/check, remove everything up to the beginning of the control messageitself, and feed it to the checkgroups script using the following command:# su news -c "/usr/lib/news/ctl/checkgroups" [ Pobierz całość w formacie PDF ]