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.
-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.
Use the specified configfile instead of the default.
Restrict the dig to documents that are at most maxhops links
away from the starting document. This only works if option -i is
-i Initial. Do not use any old databases. Old databases will be
erased before runing the program.
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.
(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=...)
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.
FORMAT OF THE PROGRESS REPORT GIVEN IN VERBOSE MODE
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.).
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)