什么是路径//，它与/有何不同 [英] What is path //, how is it different from /

问题描述

我们知道根目录是/，根据posix，还有另一个目录//与/不同.当使用ls/和ls//时，输出与stat相同，但是，如果cd/和cd//则输出不同，尽管目录内容相同. 那真的让我感到困惑.有人得到答案了吗?

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'.

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