使用代字号将目录更改为文件中指定的路径 [英] Change directory to a path specified in a file with tilde

问题描述

我有一个文件，说:~/cwd.该文件的内容为一行:

I have a file, say: ~/cwd. The content of this file is a single line:

~/tmp

我要fo cd到这个(〜/tmp)目录.我正在尝试:

I want fo cd to this (~/tmp) dir. I'm trying:

> cd `cat ~/cwd`

得到了:

-bash: cd: ~/tmp: No such file or directory

为什么相对路径失败?当~/cwd的内容是绝对路径时-它起作用.

Why the RELATIVE paths failed? When the content of the ~/cwd is absolute path - it works.

推荐答案

尝试一下:

eval cd `cat ~/cwd`

'〜'需要由shell扩展.评估会导致命令在外壳程序的命令处理过程中运行，其中包括〜"扩展.

The '~' needs to be expanded by the shell. The eval causes the command to be run through the shell's command processing, which includes '~' expansion.

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