什么是路径//，它和/有什么不同 [英] What is path //, how is it different from /

问题描述

我们知道根目录是/，根据posix，还有一个不同于/的目录//.当你 ls/和 ls//时，输出是一样的，stat 也是一样，但是如果你 cd/和 cd//，它们是不同的，虽然目录内容是一样的.这真的让我很困惑.有人有答案吗?

We know root directory is /, and according to posix, there is another directory // which differs from /. When you ls / and ls //, the output is the same, so as stat, however if you cd / and cd //, they are different, though the directory content are the same. That really confused me. Anyone got an answer?

推荐答案

来自 Bash 常见问题:

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'.

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