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<h1>索引</h1>
<p><a href="attributes.html">属性</a>和<a href="queries.html">查询</a>是Haiku的主要特性。由于属性只能独立的用于显示文件的附加信息，而对于查询，则需要建立索引。索引把属性放置在一个查询表中，而这也将会使查询更加轻量化和快速。<br />
索引是文件系统的一部分，而且它独立于特定的磁卷和分区。</p>
<h2>终端中的索引命令</h2>
<p>有几个命令可以用于管理索引：</p>
<ul>
<li><b>lsindex</b> - 显示当前磁卷或者分区中的索引属性。<br />
下面是默认索引的属性：</li>
</ul>
<pre class="terminal"> ~ ->lsindex
BEOS:APP_SIG
MAIL:account
MAIL:cc
MAIL:chain
MAIL:draft
MAIL:flags
MAIL:from
MAIL:name
MAIL:pending_chain
MAIL:priority
MAIL:reply
MAIL:status
MAIL:subject
MAIL:thread
MAIL:to
MAIL:when
META:address
META:city
META:company
META:country
META:email
META:fax
META:group
META:hphone
META:name
META:nickname
META:state
META:url
META:wphone
META:zip
_signature
_status
_trk/qrylastchange
_trk/recentQuery
be:deskbar_item_status
last_modified
name
size
</pre>
<ul>
<li><b>mkindex</b> - 为磁卷或者分区的索引添加属性。 </li>
</ul>
<pre>Usage: mkindex [options] <attribute>
Creates a new index for the specified attribute.
-d, --volume=PATH a path on the volume to which the index will be added,
defaults to current volume.
-t, --type=TYPE the type of the attribute being indexed. One of "int",
"llong", "string", "float", or "double".
Defaults to "string".
--copy-from path to volume to copy the indexes from.
-v, --verbose print information about the index being created
</pre>
<p>只有具有该属性的 <b>新建</b> 文件才可以自动添加到该索引中！
<br />
现存的文件必须通过手动的复制该文件，然后删除原件才可以添加到索引中。当然，您也可以使用 <span class="cli">reindex</span> 命令。
</p>
<ul>
<li><b>reindex</b> - 把已存在文件的属性添加到新建的磁卷或者分区的索引中。</li>
</ul>
<pre>Usage: reindex [-rvf] attr <list of filenames and/or directories>
-r enter directories recursively
-v verbose output
-f create/update all indices from the source volume,
"attr" is the path to the source volume
</pre>
<ul>
<li><b>rmindex</b> - 从磁卷或者分区的索引中删除属性。</li>
</ul>
<pre>Usage: rmindex [OPTION]... INDEX_NAME
Removes the index named INDEX_NAME from a disk volume. Once this has been
done, it will no longer be possible to use the query system to search for
files with the INDEX_NAME attribute.
-d, --volume=PATH a path on the volume from which the index will be
removed
-h, --help display this help and exit
-p, --pattern INDEX_NAME is a pattern
-v, --verbose print information about the index being removed
INDEX_NAME is the name of a file attribute.
If no volume is specified, the volume of the current directory is assumed.</pre>
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