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htdig(1)							      htdig(1)

       htdig - retrieve HTML documents for ht://Dig search engine

       htdig [options]

       Htdig  retrieves	 HTML  documents  using	 the HTTP protocol and gathers
       information from these documents which can  later  be  used  to	search
       these documents. This program can be referred to as the search robot.

       -      Get the list of URLs to start indexing from standard input. This
	      will override the default parameter start_url specified  in  the
	      config file  and the file supplied to the -m option.

       -a     Use  alternate  work  files.  Tells  htdig  to  append  .work to
	      database files, causing a second copy  of	 the  database	to  be
	      built.  This  allows  the	 original files to be used by htsearch
	      during the indexing run.

       -c configfile
	      Use the specified configfile instead of the default.

       -h maxhops
	      Restrict the dig to documents that are  at  most	maxhops	 links
	      away from the starting document. This only works if option -i is
	      also given.

       -i     Initial. Do not use any old databases.  Old  databases  will  be
	      erased before runing the program.

       -m filename
	      Minimal  run.  Only  index  the URLs given in the file filename,
	      ignoring all others. URLs in the file should  be	formatted  one
	      URL  per	line.  -s Print statistics about the dig after comple-

       -t     Create an ASCII version of the document database. This  database
	      is  easy to parse with other programs so that information can be
	      extracted from it for purposes other than searching.  One	 could
	      gather some interesting statistics from this database.

	      Fieldname				  Value
		  u	  URL
		  t	  Title
		  a	  State
			  (0 normal, 1 not found, 2 not indexed, 3 obsolete)
		  m	  Time of last modification reported by the server
		  s	  Document Size in bytes
		  H	  Excerpt of the document
		  h	  Meta Description
		  l	  Time of last rerievial
		  L	  Count of links in the document or  of outgoing links
		  b	  Number of links to the document, also called
			  incoming links or backlinks
		  c	  Hop count of this document
		  g	  Signature of this document
			  (used to detect duplicates)
		  e	  E-Mail address to use for a notification from htnotify
		  n	  Date on which such notification is sent

		  S	  Subject of the notfication message
		  d	  The text of Incoming links pointing to this document
			  (e.g. <a href="docURL">description</a>)
		  A	  Anchors in the document (i.e. <A NAME=...)

       -u username:password
	      Tells htdig to send the supplied username and password with each
	      HTTP request. The credentials will be encoded using the  ?Basic?
	      authentication  method.  There HAS to be a colon (:) between the
	      username and password.

       -v     Verbose mode. This increases the verbosity of the program. Using
	      more  than 2 is probably only useful for debugging purposes. The
	      default verbose mode (using only one -v) gives a	nice  progress
	      report  while  digging.  Please consult the section below on the
	      exact format of the progress report.

	      A line is shown for each URL, with 3 numbers before the URL  and
	      some  symbols  after  the URL. The first number is the number of
	      documents parsed so far, the second is the DocID for this	 docu-
	      ment,  and the third is the hop count of the document (number of
	      hops from one of the start_url documents). Signification of  the
	      sybols printed after the url:

	      "*" is printed for a link already visited

	      "+" is printed for a new link just queued

	      "-"  is  output  for a link rejected for any of a number of rea-
	      sons. To find out what those reasons are, you need to run	 htdig
	      with at least 3 -v options, i.e. -vvv.

       If  there are no "*", "+" or "-" symbols after the URL, it doesn't mean
       the document was not parsed or was empty, but only  that	 no  links  to
       other  documents	 were found within it. With more verbose output, these
       symbols will get interspersed in several lines of debugging output.


	      The  default configuration file.	/var/lib/htdig/db.docdb Stores
	      data    about    each    document	   (title,     url,	etc.).
	      /var/lib/htdig/db.words.db,  /var/lib/htdig/db.words.db_weakcmpr
	      Record	which	 documents    each     word	occurs	   in.
	      /var/lib/htdig/db.excerpts Stores start of each document to show
	      context of matches.

       Please  refer  to  the  HTML   pages   (in   the	  htdig-doc   package)
       /usr/share/doc/htdig-doc/html/index.html and the manual pages htdigcon-
       fig(8) , htmerge(1) , htnotify(1) , htsearch(1)	and  rundig(1)	for  a
       detailed description of ht://Dig and its commands.

       This manual page was written by Christian Schwarz, modified by Stijn de
       Bekker. It is updated and maintained by Robert Ribnitz and based on the
       HTML documentation of ht://Dig.

				 21 July 1997			      htdig(1)
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