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HISTORY(5)		      File Formats Manual		    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 normally kept sorted	in the order in	which articles are re-
       ceived, 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 be-
       low 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	gettimeofday(2).  The first  sub-field
       is  the	article's  arrival  date.   If copies of the article 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, record-
       ing when	the article was	posted.

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

       For	example,      an      article	  whose	    Message-ID	   was
       <7q2saq$sal$>,	posted on 26 Aug 1999 08:02:34 GMT and
       received	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 histori-
       cal reasons, the	key includes the trailing \0 byte (which is not	stored
       in the text file).

       Written by Rich $alz <> for  InterNetNews.   This  is
       revision	10283, dated 2018-05-14.

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



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