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HISTORY(5)									       HISTORY(5)

       history - record of current and recently expired Usenet articles

       The  file  <pathdb in inn.conf>/history keeps a record of all articles currently stored in
       the news system, as well as those that have been received but since expired.  In a typical
       production environment, this file will be many megabytes.

       The  file consists of text lines.  Each line corresponds to one article.  The file is nor-
       mally kept sorted in the order in which articles are received,  although  this  is  not	a
       requirement.   Innd(8)  appends	a  new	line each time it files an article, and expire(8)
       builds a new version of the file by removing old articles and purging old entries.

       Each line consists of two or three fields separated by a tab, shown below as \t:
	      [Hash]	     \t   date
	      [Hash]	     \t   date	 \t   token

       The Hash field is the ASCII representation of the hash of the Message-ID header.  This  is
       directly used for the key of the dbz(3).

       The  date field consists of three sub-fields separated by a tilde.  All sub-fields are the
       text representation of the number of seconds since the epoch -- i.e., a time_t;	see  get-
       timeofday(2).   The first sub-field is the article's arrival date.  If copies of the arti-
       cle are still present then the second sub-field is  either  the	value  of  the	article's
       Expires	header,  or a hyphen if no expiration date was specified.  If an article has been
       expired then the second sub-field will be a hyphen.  The third sub-field is the	value  of
       the article's Date header, recording when the article was posted.

       The  token  field  is a token of the article.  This field is empty if the article has been

       For example, an article whose Message-ID was <7q2saq$sal$1@isrv4.pa.vix.com>, posted on 26
       Aug  1999 08:02:34 GMT and recieved at 26 Aug 1999 08:06:54 GMT, could have a history line
       (broken into three lines for display) like the following:
	      [E6184A5BC2898A35A3140B149DE91D5C]  \t
		  935678987~-~935678821  \t

       In addition to the text file, there is a dbz(3) database associated  with  the  file  that
       uses  the  Message-ID  field  as  a key to determine the offset in the text file where the
       associated line begins.	For historical reasons, the key includes  the  trailing  \0  byte
       (which is not stored in the text file).

       Written	by  Rich  $alz <rsalz@uunet.uu.net> for InterNetNews.  This is revision,
       dated 2000/08/17.

       dbz(3), expire(8), inn.conf(5), innd(8), makehistory(8).

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