udev provides an ENV key for environment variables which can be used for both matching and assignment.
udev为环境变量提供了一个ENV键, 即可用来匹配也可用来赋值.
Env, the process environment (don't do this in production!)
进程环境(不要应用于生产中！)
In the profiles.xml file in Listing 7, I defined two profiles and activated them based on the value in the env (environment) property.
在 清单 7 的 profiles.xml 文件中，我定义了两个配置文件，并根据 env （环境）属性的值激活它们。
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