June 2000
Intermediate to advanced
512 pages
15h 18m
English
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Control Messages
The Usenet news protocol knows a special category of articles that
evoke certain responses or actions by the news system. These are called
control messages. They are recognized by the presence of a
Control: field in the article header, which contains the
name of the control operation to be performed. There are several types of them,
all of which are handled by shell scripts located in
/usr/lib/news/ctl.
Most of these messages perform their action automatically at the time the article
is processed by C News without notifying the newsmaster. By default, only
checkgroups messages will be handed
to the newsmaster, but you may change this by editing the scripts.
The cancel Message
The most widely known message is cancel, with which a user can cancel an
article sent earlier. This effectively removes the article from the
spool directories, if it exists. The cancel message is forwarded to all sites
that receive news from the groups affected, regardless of whether the
article has been seen already. This takes into account the possibility
that the original article has been delayed over the cancellation
message. Some news systems allow users to cancel other people’s
messages; this is, of course, a definite no-no.
newgroup and rmgroup
Two 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 been held among Usenet readers. The rules ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.