在特定目录中设置环境变量 [英] Set environmental variables in a particular directory

问题描述

这是一个.bashrc问题.我想在诸如 .rvmrc 之类的特定目录中为.bashrc设置"export FOO = bar" .

我在下面尝试过

  $ touch〜/foo/.bashrc$ echo'export RAILS_ENV = development'>>〜/foo/.bashrc$ cd foo/$ env | grep RAILS_ENV 

但是在这种情况下， RAILS_ENV 不应设置任何内容.

如果我设置为 .rvmrc 而不是.bashrc，它将通过！但这是设置为 .bashrc 的更好方法，因为我不需要安装rvm环境.

有解决方案吗?

在您的bashrc中的

解决方案

设置为:

  PROMPT_COMMAND ='[[$ PWD =="/foo/bar/"]]&&出口FOO = BAR ||未设置FOO' 

每次对提示进行重写时(实际上是在实际写入提示之前)，都会执行PROMPT_COMMAND变量的内容，上面的命令针对"/foo/bar"来检查$ PWD变量(保存您的shell的当前工作目录).如果匹配，则导出您的变量(如果不匹配)，则该变量未设置.

EG

  peteches @ yog-sothoth $ PROMPT_COMMAND ='[[$ PWD =="/home/peteches/test"]]&&出口FOO = BAR ||未设置FOO'peteches @ yog-sothoth $ pwd/home/petechespeteches @ yog-sothoth $ cd测试peteches @ yog-sothoth $ pwd/home/peteches/testpeteches @ yog-sothoth $ env |grep FOO6:FOO = BAR73:PROMPT_COMMAND = [[$ PWD =="/home/peteches/test"]]&&出口FOO = BAR ||未设置FOOpeteches @ yog-sothoth $ cd ../peteches @ yog-sothoth $ pwd/home/petechespeteches @ yog-sothoth $ env |grep FOO72:PROMPT_COMMAND = [[$ PWD =="/home/peteches/test"]]&&出口FOO = BAR ||未设置FOOpeteches @ yog-sothoth $ 

This is a .bashrc question. I would like to set "export FOO=bar" for .bashrc in a particular directory like .rvmrc.

I tried below.

$ touch ~/foo/.bashrc
$ echo 'export RAILS_ENV=development' >> ~/foo/.bashrc
$ cd foo/
$ env|grep RAILS_ENV

But RAILS_ENV shall be set nothing in this case.

If I set onto .rvmrc instead of .bashrc, it pass! But it is better way to set onto .bashrc because I do not need to install rvm environment.

Any solutions?

解决方案

in your bashrc set this:

PROMPT_COMMAND='[[ $PWD == "/foo/bar/" ]] && export FOO=BAR || unset FOO'

The contents of the PROMPT_COMMAND variable will be executed every time your prompt is rewritten ( just before it's written actually ) the command above checks the $PWD variable ( which holds the current working directory of your shell ) against "/foo/bar" if it matches it exports your variable if it doesn't then the variable is unset.

EG

peteches@yog-sothoth$ PROMPT_COMMAND='[[ $PWD == "/home/peteches/test" ]] && export FOO=BAR || unset FOO'
peteches@yog-sothoth$ pwd
/home/peteches
peteches@yog-sothoth$ cd test
peteches@yog-sothoth$ pwd
/home/peteches/test
peteches@yog-sothoth$ env | grep FOO
6:FOO=BAR
73:PROMPT_COMMAND=[[ $PWD == "/home/peteches/test" ]] && export FOO=BAR || unset FOO
peteches@yog-sothoth$ cd ../
peteches@yog-sothoth$ pwd
/home/peteches
peteches@yog-sothoth$ env | grep FOO
72:PROMPT_COMMAND=[[ $PWD == "/home/peteches/test" ]] && export FOO=BAR || unset FOO
peteches@yog-sothoth$ 

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