bash `cd //` 中的双斜杠 // 在 Linux 中是什么意思？
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What does double slash // in `cd //` mean in Linux?
提问by vitaut
I've entered a command cd //instead of cd /by mistake and instead of getting an error as I'd expect the shell (Bash) showed a prompt as if I'm in the //directory:-
我输入了一个命令，cd //而不是cd /错误地输入了一个命令，而不是像我期望的那样，shell (Bash) 显示一个提示，就好像我在//目录中一样：-
<username>@<hostname>://$
<username>@<hostname>://$ pwd
//
Listing the content of the directory shows that it is the same as /.
列出目录的内容表明它与/.
So what exactly cd //do and what's the difference from cd /?
那么究竟是cd //做什么的，和有什么区别cd /？
回答by Rahul Tripathi
Actually it means nothing and is ignored.
实际上它没有任何意义并且被忽略。
From the Bash FAQ E10::
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'.
E10) 为什么 'cd //' 将 $PWD 保留为 '//'？
POSIX.2 在其对 'cd' 的描述中说，在规范化当前工作目录时，三个或更多前导斜杠可以替换为单个斜杠。
我认为这是为了历史兼容性。某些版本的 Unix 和早期的网络文件系统使用 //hostname/path 形式的路径来访问服务器“主机名”上的“路径”。
Also the Unix standardsstates:
另外，Unix的标准规定：
A pathname that begins with two successive slashes may be interpreted in an implementation-defined manner, although more than two leading slashes shall be treated as a single slash.
以两个连续斜杠开头的路径名可以以实现定义的方式解释，但两个以上的前导斜杠应视为单个斜杠。
回答by Serpentine Cougar
This answeron AskUbuntu confirms that they are the same directory. Further, it helpfully quotes from the POSIX Pathname Resolution specification:
AskUbuntu 上的这个答案确认它们是相同的目录。此外，它有用地引用了POSIX 路径名解析规范：
A pathname consisting of a single slash shall resolve to the root directory of the process. A null pathname shall not be successfully resolved. A pathname that begins with two successive slashes may be interpreted in an implementation-defined manner, although more than two leading slashes shall be treated as a single slash.
由单个斜杠组成的路径名应解析为进程的根目录。不应成功解析空路径名。以两个连续斜杠开头的路径名可以以实现定义的方式解释，但两个以上的前导斜杠应视为单个斜杠。
