如何找出将在`cd -`中使用的路径? [英] How to find out the path that will be used in `cd -`?

问题描述

我知道可以使用 cd-在2条路径之间切换:

I know that it is possible to use cd - to switch between 2 paths:

user@server:~$ cd a
user@server:~/a$ cd ~/b
user@server:~/b$ cd -
/home/user/a
user@server:~/a$ cd -
/home/user/b
user@server:~/b$

我想使用此功能对上一条路径进行操作.也许有一些变量指向先前的路径，所以我可以像以下那样进行稀化:

I want to use this feature to do something with the previous path. Maybe there is some variable that points to the previous path so I can do thins like:

user@server:~/a$ cd ~/b
user@server:~/a$ ls -d $PREVIOUS_PATH
/home/user/a
user@server:~/a$ cp file $PREVIOUS_PATH # will copy file to /home/user/a
user@server:~/b$ cd -

推荐答案

旧工作目录存储在 OLDPWD 环境变量中.每次我们更改目录时，此变量都会更新.这也意味着我们在启动终端时未设置它.

Old working directory is stored in OLDPWD environment variable. This variable is updated every time we change directory. This also means that it is not set when we launch terminal.

user@server:~/a$ cd ~/b
user@server:~/a$ ls -d "$OLDPWD"
/home/user/a
user@server:~/a$ cp file "$OLDPWD" # will copy file to /home/user/a, ""
user@server:~/b$ cd -

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