overchan - update the news overview database


   overchan [ -D dir ] [ -c ] [ file...  ]


   Overchan  reads  article  data from files or standard input if none are
   specified.  (A single dash in the file  list  means  to  read  standard
   input.)  It uses this information to update the news overview database.
   Overchan is designed to be used by InterNetNews or the C News  ``mkov''
   packages  to update the database as the articles come in.  The database
   for each newsgroup is stored in a file named .overview in  a  newsgroup
   directory within the overview database tree.

   Overchan  locks the database file (by locking an auxiliary file) before
   appending the new  data.   To  purge  data  after  articles  have  been
   expired, see expireover(8).

   By  default,  overchan  processes  its  input as an INN overview stream
   written as a ``WO'' entry in the newsfeeds(5) file, for example:


   This data consists of a line of text, separated into  two  parts  by  a
   tab.   The  first  part  is  a list of all relative pathnames where the
   article has been written, with a single  space  between  entries.   The
   second  part  is  the data to be written into the overview file, except
   that the initial article number is omitted.  The data in  the  overview
   files  should  be  expired  by running expireover(8).  This is normally
   done by adding the ``expireover'' flag to the news.daily(8) invocation.


   -c     To process the output of the mkov(8)  program,  use  the  ``-c''
          flag.  This format is described in the ``nov'' distribution.

   -D     The  ``-D''  flag can be used to specify where the databases are
          stored.  The default directory is /var/spool/news/over.view.


   Written  by  Rob  Robertson  <rob@violet.berkeley.edu>  and  Rich  $alz
   <rsalz@uunet.uu.net>  for  InterNetNews.   This  is revision 1.9, dated


   expireover(8),    news.daily(8),     newsfeeds(5),     newsoverview(5),



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