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  61 <h1>索引</h1>
  62
  63 <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 />
  64 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>
  65
  66 <h2>终端中的索引命令</h2>
  67 <p>有几个命令可以用于管理索引：</p>
  68 <ul>
  69 <li><b>lsindex</b> - 显示当前磁卷或者分区中的索引属性。<br />
  70 下面是默认索引的属性：</li>
  71 </ul>
  72 <pre class="terminal"> ~ -&gt;lsindex
  73 BEOS:APP_SIG
  74 MAIL:account
  75 MAIL:cc
  76 MAIL:chain
  77 MAIL:draft
  78 MAIL:flags
  79 MAIL:from
  80 MAIL:name
  81 MAIL:pending_chain
  82 MAIL:priority
  83 MAIL:reply
  84 MAIL:status
  85 MAIL:subject
  86 MAIL:thread
  87 MAIL:to
  88 MAIL:when
  89 META:address
  90 META:city
  91 META:company
  92 META:country
  93 META:email
  94 META:fax
  95 META:group
  96 META:hphone
  97 META:name
  98 META:nickname
  99 META:state
 100 META:url
 101 META:wphone
 102 META:zip
 103 _signature
 104 _status
 105 _trk/qrylastchange
 106 _trk/recentQuery
 107 be:deskbar_item_status
 108 last_modified
 109 name
 110 size
 111 </pre>
 112 <ul>
 113 <li><b>mkindex</b> - 为磁卷或者分区的索引添加属性。 </li>
 114 </ul>
 115 <pre>Usage: mkindex [options] &lt;attribute&gt;
 116 Creates a new index for the specified attribute.
 117
 118   -d, --volume=PATH     a path on the volume to which the index will be added,
 119                         defaults to current volume.
 120   -t, --type=TYPE       the type of the attribute being indexed.  One of "int",
 121                         "llong", "string", "float", or "double".
 122                         Defaults to "string".
 123       --copy-from       path to volume to copy the indexes from.
 124   -v, --verbose         print information about the index being created
 125
 126 </pre>
 127 <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！
 128 <br />
 129 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。
 130 </p>
 131 <ul>
 132 <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>
 133 </ul>
 134 <pre>Usage: reindex [-rvf] attr &lt;list of filenames and/or directories&gt;
 135   -r    enter directories recursively
 136   -v    verbose output
 137   -f    create/update all indices from the source volume,
 138         "attr" is the path to the source volume
 139
 140 </pre>
 141 <ul>
 142 <li><b>rmindex</b> - 从磁卷或者分区的索引中删除属性。</li>
 143 </ul>
 144 <pre>Usage: rmindex [OPTION]... INDEX_NAME
 145
 146 Removes the index named INDEX_NAME from a disk volume.  Once this has been
 147 done, it will no longer be possible to use the query system to search for
 148 files with the INDEX_NAME attribute.
 149
 150   -d, --volume=PATH     a path on the volume from which the index will be
 151                          removed
 152   -h, --help            display this help and exit
 153   -p, --pattern         INDEX_NAME is a pattern
 154   -v, --verbose         print information about the index being removed
 155
 156 INDEX_NAME is the name of a file attribute.
 157
 158 If no volume is specified, the volume of the current directory is assumed.</pre>
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