When you write rules based on sysfs information, you are simply matching attribute contents of some files in one part of the chain. For example, I can read the size of my hard disk as follows.
当我们编写基于sysfs信息的规则时，只是简单的匹配链条上一部分文件的属性内容。
A typical relation, for instance, would associate two classes with a matching identifier attribute.
比如，一个典型的关联会用一个匹配标志符属性联系两个类。
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