该工具允许管理员将引用指定给特殊用户或组，使重定向基于角色。

The tool lets administrators assign references to particular users or groups, making redirection role-based.

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解决方法是利用一个301重定向告诉搜索引擎将这两个URL地址捆绑起来，使它们互相指向。

The solution is to tell the search engines to group both URLs together using a 301 redirect from one to the other.

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您了解了如何把数据重定向到stdin或stdout，如何使用管道，以及如何在UNIX中使用操作符；这些都有助于您编写出更强大的脚本，更好地捕捉错误，使逻辑更简洁清晰。

Knowing how to redirect data as stdin or stdout, how to use the pipe, and how to use operators in UNIX helps you write more powerful scripts with better error trapping and cleaner logic.

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