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« < a href = "filetypes.html" > 文件类型< / a >
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< h1 > Attributes（ ） < / h1 >
< p > 属性是一些数据段，它们属于文件，但却不是文件的组成部分，例如：它们不计入文件的大小，而且可以在不改变文件本身的情况下，进行复制和修改。系统利用属性来储存文件信息，例如：文件大小，类型以及最近的修改日期。这与其他的系统和文件系统相类似。< / p >
< p > 所不同的是，您可以为文件添加任何类型的属性，并可以在 Tracker 窗口中显示和修改该属性。你只需要在文件类型中添加你所希望的属性类型（例如：字符串，整数或者时间），然后进行命名，给出相关的描述。< / p >
< p > 文件本身设置不需要任何的内容，请看下面 People 文件的例子：< / p >
< img src = "images/attributes-images/people.png" alt = "people.png" / >
< br / >
< p > 您可以看到，所有的零大小文件都有附加属性，而在 Tracker 中， < / p >
< p > 如果您对这些属性做出索引，类似于 People， < / p >
< h2 >
< a href = "#" > < img src = "../images/up.png" style = "border:none;float:right" alt = "index" / > < / a >
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< a id = "attributes-tracker" name = "attributes-tracker" > Tracker中的属性< / a > < / h2 >
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< p > 属性的显示非常类似于数据库或者电子表格。利用Tracker， （ ） ， （ ） < / p >
< p > 为此，打开一个 Tracker 窗口，点击 < span class = "menu" > Attributes< / span > 菜单，选择希望显示的属性。或者，右键点击列标题，然后在快捷菜单中标记该项目。您可以通过简单的拖拽来进行纵列排序；降序排列标题。最快的移除您不需要的列的方式是直接从窗口中移出该列。< / p >
< p > 双击标题中两个属性之间的竖线，可以自动地对列的宽度进行最佳的调整。< / p >
< p > 您可以通过点击列标题来进行升序或者降序的排列 您也可以在点击列标题的同时按下 < span class = "key" > SHIFT< / span > 键来进行二次排序。 例如，你可以在联系人姓名排序的基础上，再次通过公司来对你的 People 文件进行排序。以上面的截图为例，在标题中，二次排序以较浅的颜色进行了标记。< / p >
< p > 属性的编辑和修改文件名一样简单：点击该项或者按 < span class = "key" > ALT< / span > < span class = "key" > E< / span > 键，然后使用 < span class = "key" > TAB< / span > 和 < span class = "key" > SHIFT< / span > < span class = "key" > TAB< / span > 键在属性之间移动。按下 < span class = "key" > ESC< / span > 键，退出编辑状态，不执行修改。< / p >
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< a href = "#" > < img src = "../images/up.png" style = "border:none;float:right" alt = "index" / > < / a >
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< a id = "attributes-terminal" name = "attributes-terminal" > 终端中的属性< / a > < / h2 >
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< p > 如果你喜欢使用命令行，或者计划使用脚本来处理较多的文件，那么在 Terminal 中有一些可用于控制属性的命令。< / p >
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< a href = "#" > < img src = "../images/up.png" style = "border:none;float:right" alt = "index" / > < / a >
< a id = "listattr" name = "listattr" > listattr< / a > < / h3 >
< p > < span class = "cli" > listattr< / span > 命令列出了文件的属性，但不显示属性内容。< / p >
< pre > usage: listattr 'filename' ['filename' ...]< / pre >
< p > 上面我们的截图中的例子：< / p >
< pre class = "terminal" > ~/people -> listattr Clara\ Botters
File: Clara Botters
Type Size Name
----------- --------- -------------------------------
MIME String 21 "BEOS:TYPE"
Text 14 "META:name"
Text 6 "META:nickname"
Text 1 "META:company"
Text 18 "META:address"
Text 8 "META:city"
Text 1 "META:state"
Text 1 "META:zip"
Text 1 "META:country"
Text 1 "META:hphone"
Text 13 "META:wphone"
Text 1 "META:fax"
Text 19 "META:email"
Text 1 "META:url"
Text 5 "META:group"
Raw Data 20 "_trk/pinfo_le"
131 bytes total in attributes.< / pre >
< p > 除了所有的 "< tt > META:*< / tt > " 属性用于显示联系方式，还有两个由系统管理的属性：< / p >
< ul >
< li > < p > < tt > BEOS:TYPE< / tt > 以 < acronym title = "Multipurpose Internet Mail Extensions" > MIME< / acronym > 字符串的形式保存文件类型，保存于 "< tt > application/x-person< / tt > " 。它决定了默认的图标以及当你双击打开该文件时所要运行的程序。< / p > < / li >
< li > < p > "< tt > _trk/pinfo_le< / tt > " 是一个位置属性， < / p > < / li > < / ul >
< div class = "box-info" > 需要注意的是 "Clara" 之后的反斜杠。在 Terminal 中您必须 "避开" 特殊字符，例如 < tt > '"*\$?!< / tt > ；同时，处于 "Clara" 和 "Botters" 之间的空格也属于此类字符。所以反斜杠真实的出现在空格字符之前，而不是 "Clara" 之后。< / div >
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< a href = "#" > < img src = "../images/up.png" style = "border:none;float:right" alt = "index" / > < / a >
< a id = "catattr" name = "catattr" > catattr< / a > < / h3 >
< p > < span class = "cli" > catattr< / span > 命令显示了文件特有属性的内容。< / p >
< pre > usage: catattr [--raw|-r] attr_name file1 [file2...]< / pre >
< p > 还是上面的例子：< / p >
< pre class = "terminal" > ~/people -> catattr META:city Clara\ Botters
Clara Botters : string : Whelton< / pre >
< h3 >
< a href = "#" > < img src = "../images/up.png" style = "border:none;float:right" alt = "index" / > < / a >
< a id = "addattr" name = "addattr" > addattr< / a > < / h3 >
< p > < span class = "cli" > addattr< / span > 命令用于为文件添加属性，并进行赋值。< / p >
< pre > usage: addattr [-t type] attr value file1 [file2...]
or: addattr [-f value-from-file] [-t type] attr file1 [file2...]
Type is one of:
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string, mime, int, llong, float, double, bool, icon, raw
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or a numeric value (ie. 0x1234, 42, 'ABCD', ...)
The default is "string"< / pre >
< p > 所以当亲爱的 Clara 在跨国公司 Barkelbaer Inc.找到了工作，你就可以为原本空白的 "Company" 属性补充该数据 (而此数据也属于 "string" 类型)： < / p >
< pre class = "terminal" > ~/people -> addattr -t string META:company Barkelbaer\ Inc. Clara\ Botters< / pre >
< h3 >
< a href = "#" > < img src = "../images/up.png" style = "border:none;float:right" alt = "index" / > < / a >
< a id = "rmattr" name = "rmattr" > rmattr< / a > < / h3 >
< p > < span class = "cli" > rmattr< / span > 命令用于从文件中完全移除其某一属性。< / p >
< pre > usage: rmattr [-p] attr filename1 [filename2...]
'attr' is the name of an attribute of the file
If '-p' is specified, 'attr' is regarded as a pattern.< / pre >
< p > 即使不填写 "Fax" 属性，在实际应用中也已经足够了；所以你可以通过键入下面的命令来从 Clara 文件中完全删除它：< / p >
< pre class = "terminal" > ~/people -> rmattr META:fax Clara\ Botters< / pre >
< h3 >
< a href = "#" > < img src = "../images/up.png" style = "border:none;float:right" alt = "index" / > < / a >
< a id = "copyattr" name = "copyattr" > copyattr< / a > < / h3 >
< p > < span class = "cli" > copyattr< / span > 命令用于从一些文件向另一些文件拷贝属性。默认情况下，文件的实际内容并< b > 没有< / b > 进行拷贝。< / p >
< pre > Usage: copyattr < options> < source> [ ... ] < destination> < / pre >
< p > 如果您希望完全拷贝文件的属性及其数据文件，你可以在命令后添加 "< span class = "cli" > -d< / span > " 或者 "< span class = "cli" > --data< / span > " 来完成。< / p >
< p > < br / > < / p >
< p > 更多有关这些命令和它们的参数选项的信息，您可以通过键入命令名，然后辅以 "< span class = "cli" > -h< / span > " 或者 "< span class = "cli" > --help< / span > " 选项来获取。< / p >
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