符号链接文件也称为symlink，是一种简单的文件，当被访问时，它会将请求重定向到另一个文件。

When accessed, a symbolic link file, also called a symlink, redirects the requester to another file.

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UNIX 系统中大量使用符号链接来链接文件系统的两个区域。

Symbolic links are used extensively on UNIX systems to link two areas of a file system.

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它的工作机理是这样的：当系统处理的文件是一个符号链接时，系统会自动的将这个符号链接映射到符号链接指向的文件。

Here's how it works: Whenever the system is given a file name that is a symbolic link, it transparently maps it to the file it is pointing to.

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