当您希望临时切换目录然后返回原始目录时，通常使用此目录功能。
The directory functionality is most often used when you want to temporarily change your directory and then go back to the original directory.
通常，通过设置su账户让用户可以临时切换为另一个账户，例如root用户或应用程序所有者。
Typically, su accounts are setup so that a user can temporarily switch to another account, for example the root user or an application owner.
阅读“ 针对 Linux 开发新手的基本任务”（developerWorks，2003 年），了解如何临时切换到不同的用户。
Read " Basic tasks for new Linux developers" (developerWorks, 2003) for instructions on how to temporarily switch to a different user.
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