htdig - retrieve HTML documents for ht://Dig search engine
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.
- 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
- 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 completion.
- 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.
||(0 normal, 1 not found, 2 not indexed, 3 obsolete)
||Time of last modification reported by the server
||Document Size in bytes
||Excerpt of the document
||Time of last rerievial
||Count of links in the document or of outgoing links
||Number of links to the document, also called
||incoming links or backlinks
||Hop count of this document
||Signature of this document
||(used to detect duplicates)
||E-Mail address to use for a notification from htnotify
||Date on which such notification is sent
||Subject of the notfication message
||The text of Incoming links pointing to this document
||(e.g. <a href="docURL">description</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.
- 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 document, 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
reasons. 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
- The default configuration file.
/usr/local/share/htdig/database/db.docdb Stores data about each
document (title, url, etc.).
/usr/local/share/htdig/database/db.words.db_weakcmpr Record which
documents each word occurs in.
/usr/local/share/htdig/database/db.excerpts Stores start of each
document to show context of matches.
Please refer to the HTML pages (in the htdig-doc package)
and the manual pages
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.