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<![endif]--><script type="text/javascript" src="common/browserDetect.js"></script><script type="text/javascript" src="common/jquery/jquery-1.7.2.min.js"></script><script type="text/javascript" src="common/jquery/jquery.ui.all.js"></script><script type="text/javascript" src="common/jquery/jquery.cookie.js"></script><script type="text/javascript" src="common/jquery/treeview/jquery.treeview.min.js"></script><script type="text/javascript" src="common/jquery/layout/jquery.layout.js"></script><script type="text/javascript" src="search/l10n.js"></script><script type="text/javascript" src="search/htmlFileInfoList.js"></script><script type="text/javascript" src="search/nwSearchFnt.js"></script><script type="text/javascript" src="search/stemmers/en_stemmer.js"><!--//make this scalable to other languages as well.--></script><script type="text/javascript" src="search/index-1.js"></script><script type="text/javascript" src="search/index-2.js"></script><script type="text/javascript" src="search/index-3.js"></script></head><body><noscript><div id="noscript">JavaScript is disabled on your browser. Please enable JavaScript to enjoy all the features of this site.</div></noscript><div id="header"><a href="index.html"><img style="margin-right: 2px; height: 59px; padding-right: 25px; padding-top: 8px" align="right" src="common/images/logo.png" alt=" Documentation"></img></a><h1>Recoll user manual<br></br>Introduction</h1><div id="navheader"><table class="navLinks"><tr><td><a id="showHideButton" href="#" onclick="myLayout.toggle('west')" class="pointLeft" tabindex="5" title="Hide TOC tree">Sidebar
</a></td><td><a accesskey="p" class="navLinkPrevious" tabindex="5" href="RCL.INTRODUCTION.SEARCH.html">Prev</a>
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<a accesskey="u" class="navLinkUp" tabindex="5" href="RCL.INTRODUCTION.html">Up</a>
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<a accesskey="n" class="navLinkNext" tabindex="5" href="RCL.INDEXING.html">Next</a></td></tr></table></div></div><div id="content"><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="RCL.INTRODUCTION.RECOLL"></a>Recoll overview</h2></div></div></div><p><span class="application">Recoll</span> uses the
<a class="ulink" href="http://www.xapian.org" target="_top"><span class="application">Xapian</span></a> information retrieval
library as its storage and retrieval engine. <span class="application">Xapian</span> is a very
mature package using <a class="ulink" href="http://www.xapian.org/docs/intro_ir.html" target="_top">a sophisticated
probabilistic ranking model</a>.</p><p>The <span class="application">Xapian</span> library manages an index database which
describes where terms appear in your document files. It
efficiently processes the complex queries which are produced by
the <span class="application">Recoll</span> query expansion mechanism, and is in charge of the
all-important relevance computation task.</p><p><span class="application">Recoll</span> provides the mechanisms and interface to get data
into and out of the index. This includes translating the many
possible document formats into pure text, handling term
variations (using <span class="application">Xapian</span> stemmers), and spelling approximations
(using the <span class="application">aspell</span> speller),
interpreting user queries and presenting results.</p><p>In a shorter way, <span class="application">Recoll</span> does the dirty footwork, <span class="application">Xapian</span>
deals with the intelligent parts of the process.</p><p>The <span class="application">Xapian</span> index can be big (roughly the size of the
original document set), but it is not a document
archive. <span class="application">Recoll</span> can only display documents that still exist at
the place from which they were indexed. (Actually, there is a
way to reconstruct a document from the information in the
index, but the result is not nice, as all formatting,
punctuation and capitalization are lost).</p><p><span class="application">Recoll</span> stores all internal data in <span class="application">Unicode
UTF-8</span> format, and it can index files of many types
with different character sets, encodings, and languages into the
same index. It can process documents embedded inside other
documents (for example a pdf document stored inside a Zip
archive sent as an email attachment...), down to an arbitrary
depth.</p><p>Stemming is the process by which <span class="application">Recoll</span> reduces words to
their radicals so that searching does not depend, for example, on a
word being singular or plural (floor, floors), or on a verb tense
(flooring, floored). Because the mechanisms used for stemming
depend on the specific grammatical rules for each language, there
is a separate <span class="application">Xapian</span> stemmer module for most common languages where
stemming makes sense.</p><p><span class="application">Recoll</span> stores the unstemmed versions of terms in the main index
and uses auxiliary databases for term expansion (one for each
stemming language), which means that you can switch stemming
languages between searches, or add a language without needing a
full reindex.</p><p>Storing documents written in different languages in the same
index is possible, and commonly done. In this situation, you can
specify several stemming languages for the index. </p><p><span class="application">Recoll</span> currently makes no attempt at automatic language
recognition, which means that the stemmer will sometimes be applied
to terms from other languages with potentially strange results. In
practise, even if this introduces possibilities of confusion, this
approach has been proven quite useful, and it is much less
cumbersome than separating your documents according to what
language they are written in.</p><p>By default, <span class="application">Recoll</span> strips most accents and
diacritics from terms, and converts them to lower case before
either storing them in the index or searching for them. As a
consequence, it is impossible to search for a particular
capitalization of a term (<code class="literal">US</code> /
<code class="literal">us</code>), or to discriminate two terms based on
diacritics (<code class="literal">sake</code> / <code class="literal">sak��</code>,
<code class="literal">mate</code> / <code class="literal">mat��</code>).</p><p><span class="application">Recoll</span> versions 1.18 and newer can optionally store the raw
terms, without accent stripping or case conversion. In this
configuration, default searches will behave as before, but it is
possible to perform searches sensitive to case and
diacritics. This is described in more detail
in the <a class="link" href="RCL.INDEXING.CONFIG.SENS.html" title="Index case and diacritics sensitivity">section about index
case and diacritics sensitivity</a>.</p><p><span class="application">Recoll</span> has many parameters which define exactly what to
index, and how to classify and decode the source
documents. These are kept in <a class="link" href="RCL.INDEXING.CONFIG.html" title="Index configuration">configuration files</a>. A
default configuration is copied into a standard location
(usually something like
<code class="filename">/usr/share/recoll/examples</code>)
during installation. The default values set by the
configuration files in this directory may be overridden by
values set inside your personal configuration, found
by default in the <code class="filename">.recoll</code> sub-directory
of your home directory. The default configuration will index
your home directory with default parameters and should be
sufficient for giving <span class="application">Recoll</span> a try, but you may want to adjust
it later, which can be done either by editing the text files
or by using configuration menus in the
<span class="command"><strong>recoll</strong></span> GUI. Some other parameters affecting only
the <span class="command"><strong>recoll</strong></span> GUI are stored in the standard
location defined by <span class="application">Qt</span>.</p><p>The <a class="link" href="RCL.INDEXING.PERIODIC.EXEC.html" title="Running indexing">indexing
process</a> is started automatically the first time you
execute the <span class="command"><strong>recoll</strong></span> GUI. Indexing can also
be performed by executing the <span class="command"><strong>recollindex</strong></span>
command. <span class="application">Recoll</span> indexing is multithreaded by default when
appropriate hardware resources are available, and can perform
in parallel multiple tasks among text extraction, segmentation
and index updates.</p><p><a class="link" href="RCL.SEARCH.html" title="Searching">Searches</a> are usually
performed inside the <span class="command"><strong>recoll</strong></span> GUI, which has many
options to help you find what you are looking for. However, there
are other ways to perform <span class="application">Recoll</span> searches: mostly a <a class="link" href="RCL.SEARCH.COMMANDLINE.html" title="Searching on the command line">
command line interface</a>, a
<a class="link" href="RCL.PROGRAM.API.PYTHON.html" title="Python interface">
<span class="application">Python</span>
programming interface</a>, a <a class="link" href="RCL.SEARCH.KIO.html" title="Searching with the KDE KIO slave">
<span class="application">KDE</span> KIO slave module</a>, and
Ubuntu Unity <a class="ulink" href="https://bitbucket.org/medoc/unity-lens-recoll" target="_top">
Lens</a> (for older versions) or
<a class="ulink" href="https://bitbucket.org/medoc/unity-scope-recoll" target="_top">
Scope</a> (for current versions) modules.
</p></div><script type="text/javascript" src="common/main.js"></script><script type="text/javascript" src="common/splitterInit.js"></script><div class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="RCL.INTRODUCTION.SEARCH.html">Prev</a>��</td><td width="20%" align="center"><a accesskey="u" href="RCL.INTRODUCTION.html">Up</a></td><td width="40%" align="right">��<a accesskey="n" href="RCL.INDEXING.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">��</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">��</td></tr></table></div></div><div id="sidebar"><div id="leftnavigation" style="padding-top:3px;"><div id="tabs"><ul><li><a href="#treeDiv" style="outline:0;" tabindex="1"><span class="contentsTab">Contents</span></a></li><li><a href="#searchDiv" style="outline:0;" tabindex="1" onclick="doSearch()"><span class="searchTab">Search</span></a></li></ul><div id="treeDiv"><img src="common/images/loading.gif" alt="loading table of contents..." id="tocLoading" style="display:block;"></img><div id="ulTreeDiv" style="display:none"><ul id="tree" class="filetree"><li><span class="file"><a href="RCL.INTRODUCTION.html" tabindex="1">Introduction</a></span><ul><li><span class="file"><a href="RCL.INTRODUCTION.TRYIT.html" tabindex="1">Giving it a try</a></span></li><li><span class="file"><a href="RCL.INTRODUCTION.SEARCH.html" tabindex="1">Full text search</a></span></li><li id="webhelp-currentid"><span class="file"><a href="RCL.INTRODUCTION.RECOLL.html" tabindex="1">Recoll overview</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.html" tabindex="1">Indexing</a></span><ul><li><span class="file"><a href="RCL.INDEXING.INTRODUCTION.html" tabindex="1">Introduction</a></span><ul><li><span class="file"><a href="RCL.INDEXING.INTRODUCTION.MODES.html" tabindex="1">Indexing modes</a></span></li><li><span class="file"><a href="RCL.INDEXING.INTRODUCTION.CONFIG.html" tabindex="1">Configurations, multiple indexes</a></span></li><li><span class="file"><a href="ch02s01s03.html" tabindex="1">Document types</a></span></li><li><span class="file"><a href="ch02s01s04.html" tabindex="1">Indexing failures</a></span></li><li><span class="file"><a href="ch02s01s05.html" tabindex="1">Recovery</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.STORAGE.html" tabindex="1">Index storage</a></span><ul><li><span class="file"><a href="RCL.INDEXING.STORAGE.FORMAT.html" tabindex="1">Xapian index formats</a></span></li><li><span class="file"><a href="RCL.INDEXING.STORAGE.SECURITY.html" tabindex="1">Security aspects</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.CONFIG.html" tabindex="1">Index configuration</a></span><ul><li><span class="file"><a href="RCL.INDEXING.CONFIG.MULTIPLE.html" tabindex="1">Multiple indexes</a></span></li><li><span class="file"><a href="RCL.INDEXING.CONFIG.SENS.html" tabindex="1">Index case and diacritics sensitivity</a></span></li><li><span class="file"><a href="RCL.INDEXING.CONFIG.GUI.html" tabindex="1">The index configuration GUI</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.WEBQUEUE.html" tabindex="1">Indexing WEB pages you wisit</a></span></li><li><span class="file"><a href="RCL.INDEXING.EXTATTR.html" tabindex="1">Extended attributes data</a></span></li><li><span class="file"><a href="RCL.INDEXING.EXTTAGS.html" tabindex="1">Importing external tags</a></span></li><li><span class="file"><a href="RCL.INDEXING.PERIODIC.html" tabindex="1">Periodic indexing</a></span><ul><li><span class="file"><a href="RCL.INDEXING.PERIODIC.EXEC.html" tabindex="1">Running indexing</a></span></li><li><span class="file"><a href="RCL.INDEXING.PERIODIC.AUTOMAT.html" tabindex="1">Using cron to automate
indexing</a></span></li></ul></li><li><span class="file"><a href="RCL.INDEXING.MONITOR.html" tabindex="1">Real time indexing</a></span><ul><li><span class="file"><a href="RCL.INDEXING.MONITOR.FASTFILES.html" tabindex="1">Slowing down the reindexing rate for fast changing
files</a></span></li></ul></li></ul></li><li><span class="file"><a href="RCL.SEARCH.html" tabindex="1">Searching</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.html" tabindex="1">Searching with the Qt graphical user interface</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.SIMPLE.html" tabindex="1">Simple search</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.RESLIST.html" tabindex="1">The default result list</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.RESLIST.SUGGS.html" tabindex="1">No results: the spelling suggestions</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.RESULTLIST.MENU.html" tabindex="1">The result list right-click menu</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.GUI.RESTABLE.html" tabindex="1">The result table</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.RUNSCRIPT.html" tabindex="1">Running arbitrary commands on result files (1.20 and later)</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.THUMBNAILS.html" tabindex="1">Displaying thumbnails</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.PREVIEW.html" tabindex="1">The preview window</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.PREVIEW.SEARCH.html" tabindex="1">Searching inside the preview</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.GUI.FRAGBUTS.html" tabindex="1">The Query Fragments window</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.COMPLEX.html" tabindex="1">Complex/advanced search</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.COMPLEX.TERMS.html" tabindex="1">Avanced search: the "find" tab</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.COMPLEX.FILTER.html" tabindex="1">Avanced search: the "filter" tab</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.COMPLEX.HISTORY.html" tabindex="1">Avanced search history</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.GUI.TERMEXPLORER.html" tabindex="1">The term explorer tool</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.MULTIDB.html" tabindex="1">Multiple indexes</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.HISTORY.html" tabindex="1">Document history</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.SORT.html" tabindex="1">Sorting search results and collapsing duplicates</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.TIPS.html" tabindex="1">Search tips, shortcuts</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.TIPS.TERMS.html" tabindex="1">Terms and search expansion</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.TIPS.PHRASES.html" tabindex="1">Working with phrases and proximity</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.TIPS.MISC.html" tabindex="1">Others</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.SAVING.html" tabindex="1">Saving and restoring queries (1.21 and later)</a></span></li><li><span class="file"><a href="RCL.SEARCH.GUI.CUSTOM.html" tabindex="1">Customizing the search interface</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.CUSTOM.RESLIST.html" tabindex="1">The result list format</a></span><ul><li><span class="file"><a href="RCL.SEARCH.GUI.CUSTOM.RESLIST.html#RCL.SEARCH.GUI.CUSTOM.RESLIST.PARA" tabindex="1">The paragraph format</a></span></li></ul></li></ul></li></ul></li><li><span class="file"><a href="RCL.SEARCH.KIO.html" tabindex="1">Searching with the KDE KIO slave</a></span><ul><li><span class="file"><a href="RCL.SEARCH.KIO.INTRO.html" tabindex="1">What's this</a></span></li><li><span class="file"><a href="RCL.SEARCH.KIO.SEARCHABLEDOCS.html" tabindex="1">Searchable documents</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.COMMANDLINE.html" tabindex="1">Searching on the command line</a></span></li><li><span class="file"><a href="RCL.SEARCH.SYNONYMS.html" tabindex="1">Using Synonyms (Recoll 1.22 and later)</a></span></li><li><span class="file"><a href="RCL.SEARCH.PTRANS.html" tabindex="1">Path translations</a></span></li><li><span class="file"><a href="RCL.SEARCH.LANG.html" tabindex="1">The query language</a></span><ul><li><span class="file"><a href="RCL.SEARCH.LANG.MODIFIERS.html" tabindex="1">Modifiers</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.CASEDIAC.html" tabindex="1">Search case and diacritics sensitivity</a></span></li><li><span class="file"><a href="RCL.SEARCH.ANCHORWILD.html" tabindex="1">Anchored searches and wildcards</a></span><ul><li><span class="file"><a href="RCL.SEARCH.WILDCARDS.html" tabindex="1">More about wildcards</a></span><ul><li><span class="file"><a href="RCL.SEARCH.WILDCARDS.PATH.html" tabindex="1">Wildcards and path filtering</a></span></li></ul></li><li><span class="file"><a href="RCL.SEARCH.ANCHOR.html" tabindex="1">Anchored 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