什么是路径//，它与/有什么不同？

Question

我们知道根目录是/，并且根据posix，还有另一个目录//与/不同。当你ls /和ls //时，输出是相同的，所以作为stat，但是如果你cd /和cd //，它们是不同的，虽然目录内容是相同的。 这让我很困惑。有人得到了答案吗？

Answer 1

来自Bash FAQ：

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'.