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Manual Reference Pages  -  INDEXER (1)


indexer - indexing WWW space.




indexer [ -a ] [ -n number ] [ -e ] [ -m ] [ -q ] [ -t tag ] [ -u pattern ] [ -s status ] [ configfile ]

indexer -C [ -t tag ] [ -u pattern ] [ -s status ] [ configfile ]

indexer -S [ -t tag ] [ -u pattern ] [ -s status ] [ configfile ]

indexer -I [ -t tag ] [ -u pattern ] [ -s status ] [ configfile ]

indexer -L lang -A affixfile

indexer -L lang -D dictionaryfile

indexer -h|-?


indexer is a part of UdmSearch - web search engine. The purpose of indexer is to walk through HTTP, FTP, NEWS servers as well as local file system, recursively grabbing all the documents and storing metadata about documents into SQL or built-in database in a smart and effective manner. Since every document is referenced by its corresponding URL, metadata collected by indexer is used later in a search process.

The behaviour of indexer is controlled mainly via configuration file indexer.conf (5) , which it reads on startup. There is a compiled-in default for configuration file name and location, so you don’t need to specify it every time you run indexer , but you can specify alternative configuration file as the last argument.

indexer supports HTML-formatted (text/html MIME type) and plain text (text/plain MIME type) documents. Support for other data types is provided by using external programs, which are called "parsers". Parser should get data of some type from stdin and put text/html or text/plain data to stdout. See indexer.conf(5) for details.

You may run indexer regularly from cron (8) to keep metadata up-to-date.

indexer is also used to manipulate with database. It may be used to clear some data from database, to output some statistics and to load ispell data into database.



-a Reindex all documents.

By default indexer reindex only whose documents that are "expired", e.g. time since their last reindexing is greater than "Period" from indexer.conf (5) file. This option disables the feature, so all documents will be reindexed, irrelevant to their state. To achieve this, indexer just first marks all URLs as "expired". This gives the following side effect: if you start indexer -a and then terminate it (for example, by pressing Ctrl-C ) and start again, all URLs will be considered "expired" and will be reindexed again.

-n number Reindex only given number of URLs and exit.

-c seconds limit indexing time to a given number of seconds

-e Reindex most expired documents first. That option forces the list of documents to reindex to be sorted by last reindexing time. That means that most "expired" documents will be reindexed first. You may or may not experience some minor delay with that option, but at least in theory it should slow down indexer a bit.

The combination of -e and -n number is seems to be of some value. So, you can use indexer -e -n 100 to reindex just 100 most expired documents.

-m This option makes indexer to reindex documents, even if their content has not been modified. It is achived by disabling If-Modified-Since HTTP header and MD5 hash check. This is usable if you have changed some Allow , Disallow , MaxHops or other directives in your indexer.conf(5) file. Thus, there will be different set of rules for storing document URLs and so different set of URLs. To find out that URLs, there is a need to reindex even-not-changed documents.

-q Quick startup. This mode is useful if you haven’t added or modified Server commands. indexer will not insert into database URLs given in Server commands which leads to some startup speed-up.

Subsection control

-t tag
-u pattern
-s status Set URL filters on tag , pattern and status respectively.

tag is a server tag that you can arbitrary set in config file indexer.conf (5)

pattern is a SQL LIKE wildcard for URL. In short, underscore ( _ ) means "any symbol", and per cent ( % ) means "any symbols", and the comparison is case insensitive. For example, indexer -u will reindex all documents that URLs contains string "".

status is a filter on document’s HTTP status obtained during last reindexing. For example, -s 0 is a filter for all documents that has not been indexed before. -s 200 is a filter for all documents that was retrieved with "HTTP 200 Ok" status, and -s 301 is a filter for all documents that was retrieved with "HTTP 301 Redirect" status. See HTTP protocol specifications for details on HTTP status codes and their respective meanings.

You can freely combine any number of -t , -u and -s options. The filters of the same class (tag, pattern, status) are be combined using logical OR, and the filters of different classes will be combined using logical AND. That means, if you type indexer -u -u -t 1 -s 200 the documents-to-index will be those with tag 1 and HTTP status 200, which URLs contains the strings "" or "".

Ispell import

-L language Set the language of given files. language is a two-letter ISO country code (en, ru, de etc.). This parameter is obligatory if you are importing ispell data.

-A affix_file Import given affix_file to database.

-D dict_file Import given dict_file to database.


-C Clear databases.

This will erase data previously collected by indexer from the UdmSearch databases. You can use options -t , -u and -s described above to select what do you want to delete.

WARNING: Use this option with extreme caution!

-S Show statistics.

This option outputs a brief statistics of how many documents are there in database, their HTTP status, and how many documents are expired. You can use options -t , -u and -s described above to select what documents do you want statistics on.

-I Show referrers.

This option shows you the referrers of URLs. Or, in other words, all hyperlinks from the document. You can use options -t , -u and -s described above to select what documents do you want to show referrers on.

-? Shows help screen with brief overall description of indexer options.


If you think you’ve found a bug in indexer, please report it to UdmSearch mailing list <> (please post in English only).


Copyright © 1988, 1999, 2000 UdmSearch Developers Team (

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


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UdmSearch 3.0 INDEXER (1) 16 May 2000

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