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NEWSOVERVIEW(8CN)					     NEWSOVERVIEW(8CN)

NAME
       initov, domkov, mkov, expov - maintain netnews overview database

SYNOPSIS
       /usr/local/libexec/cnews/nov/initov
       /usr/local/libexec/cnews/nov/domkov
       /usr/local/libexec/cnews/nov/mkov [ -an ] [ -o stamp ] [	file ... ]
       /usr/local/libexec/cnews/nov/expov

DESCRIPTION
       These programs keep the netnews overview	database for newsreaders up to
       date.

       Initov creates the database initially by	reading	all the	articles under
       /var/news.   This  takes	a long time (on	the order of 12	hours, in late
       1992), and can be avoided by letting domkov  incrementally  generate  a
       database	 for new articles as they arrive; after	a week or so, most ar-
       ticles should be	in the database.  The news system should not be	locked
       when  initov  is	run; initov takes care of the necessary	locking	inter-
       nally, and deals	with articles that arrive while	it is running (primar-
       ily by deferring	their processing to domkov).

       Domkov  is  run	from newsrun(8CN).  It updates the database files from
       the header stream produced by relaynews(8CN) for	new articles.

       Mkov normally reads a stream of RFC 1036	headers, with  those  of  each
       article	separated  from	those of its neighbours	by an empty line, from
       files (standard input if	none) and writes a summary in  the  format  of
       newsoverview(5),	 but  with a field containing the article's news spool
       directory name relative to /usr/spool/news prepended, on	standard  out-
       put.   -a reads articles	instead	of a header stream (but	ignores	filess
       which are directories or	have  names  which  do	not  resemble  article
       names,  i.e. do not have	a leading digit	on their last component).  and
       omits the initial directory name	field; -n requests the initial	direc-
       tory name despite -a; -o	causes only articles older than	the file stamp
       to be summarised.

       Expov should be run after expire(8CN) (and  is,	by  doexpire(8CN))  to
       delete database entries for missing articles.

FILES
       /var/news/group/.overview
			   overview database
       /var/lib/news/LOCKoverview
			   lock	file for the database
       /var/lib/news/headers
			   stream of headers from newly-arrived	articles
       /var/lib/news/active
			   active newsgroups

SEE ALSO
       newsoverview(5),	expire(8CN), relaynews(8CN)

HISTORY
       Written	by Geoff Collyer, with minor contributions from	Henry Spencer,
       as part of the C	News project.

BUGS
       mkov -o is a blemish, but it really speeds up initov.

				  15 Aug 1994		     NEWSOVERVIEW(8CN)

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY | BUGS

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