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我们知道根目录是/，根据posix，还有另一个目录//与/不同。当你 ls / 和 ls // 时，输出是一样的，就像 stat，但是如果你 cd / 和 cd //，它们是不同的，尽管目录内容是一样的。这真的让我很困惑。有人有答案吗？

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来自Bash 常见问题解答：

E10) Why does `cd //' leave $PWD as `//'?

POSIX.2, in its description of `cd', says that *three* or more leading
slashes may be replaced with a single slash when canonicalizing the
current working directory.

This is, I presume, for historical compatibility.  Certain versions of
Unix, and early network file systems, used paths of the form
//hostname/path to access `path' on server `hostname'.
于 2013-05-30T16:32:43.837 回答