符号链接CD的行为/ bash的 [英] Behavior of cd/bash on symbolic links

问题描述

假设我在我的个人文件夹中的文件夹〜/ A / B，并将该文件夹B包含
一个符号链接'..'名为符号链接。然后，我执行以下操作
庆典：

Assume I have the folders ~/a/b in my home folder, and the folder b contains a symbolic link to '..' named 'symlink'. Then I perform the following actions in bash:

hm@mach:~$ cd a/b/symlink
hm@mach:~/a/b/symlink$ pwd -P
/home/hm/a
hm@mach:~/a/b/symlink$ cd ..
hm@mach:~/a/b$ pwd -P
/home/hm/a/b

PWD -P打印当前工作目录，取消引用所有符号链接。
为什么工作目录/ home / HM / A /末B，而不是/家/嗯？

pwd -P prints the current working directory, dereferencing all symbolic links. Why is the working directory /home/hm/a/b at the end, and not /home/hm?

推荐答案

庆典是被友好;当你 CD /到/ A /符号链接/ ，外壳记得原来的位置（在 $ OLDPWD ）和意志使用的是的目录，当你 CD .. 要回到你刚才是在目录中的假设下。

bash is being "friendly"; when you cd /into/a/symlink/, the shell remembers the old location (in $OLDPWD) and will use that directory when you cd .. under the assumption that you want to return to the directory you were just in.

如果您想使用的真正的 .. ，则还必须使用 CD-P ：

If you want to use the real .., then you must also use cd -P:

          The -P option says to use the physical directory
          structure instead of following symbolic links (see
          also the -P option to the set builtin command);
          the -L option forces symbolic links to be followed.

$ cd
$ cd a/b/symlink
$ cd -P ..
$ pwd -P
/home/sarnold
$ 

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