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HISTORY(5)							    HISTORY(5)

       history - record of current and recently expired Usenet articles

       The  file  /var/spool/news/data/history	keeps a record of all articles
       currently stored in the news system, as well as those  that  have  been
       received but since expired.

       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
       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:
	      <Message-ID>   \t	  date
	      <Message-ID>   \t	  date	 \t   files

       The Message-ID field is the value of the article's  Message-ID  header,
       including the angle brackets.

       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  files  field  is a set of entries separated by one or more spaces.
       Each entry consists of the name of the  newsgroup,  a  slash,  and  the
       article number.	This field is empty if the article has been expired.

       For   example,	an   article  cross-posted  to	comp.sources.unix  and
       comp.sources.d that was posted on February 10, 1991 (and received three
       minutes	later),	 with  an expiration date of May 5, 1991, could have a
       history line (broken into two lines for display) like the following:
	      <312@litchi.foo.com>  \t	666162000~673329600~666162180  \t
		  comp.sources.unix/1104 comp.sources.d/7056

       In addition to the text file, there is a	 dbz(3z)  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 <rsalz@uunet.uu.net> for  InterNetNews.   This  is
       revision 1.9, dated 1993/01/29.

       dbz(3z), expire(8), innd(8), news-recovery(8).


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