How to I export a system scope environment variable in bash

I need to set a system environment variable from a bash script that would be available outside of the current scope. So you would normally export environment variables like this:

export MY_VAR=/opt/my_var

But I need the environment variable to be available at a system level though. Is this possible?

Answers


This is the only way I know to do what you want:

In foo.sh, you have:

#!/bin/bash
echo MYVAR=abc123

And when you want to get the value of the variable, you have to do the following:

$ eval "$(foo.sh)"  # assuming foo.sh is in your $PATH
$ echo $MYVAR #==> abc123

Depending on what you want to do, and how you want to do it, Douglas Leeder's suggestion about using source could be used, but it will source the whole file, functions and all. Using eval, only the stuff that gets echoed will be evaluated.


Not really - once you're running in a subprocess you can't affect your parent.

There two possibilities:

1) Source the script rather than run it (see source .):

    source {script}

2) Have the script output the export commands, and eval that:

    eval `bash {script}`
OR:
    eval "$(bash script.sh)"

EDIT: Corrected the second option to be eval rather than source. Opps.


Need Your Help

best practice to handle this exception case

c# exception-handling

let's say methodA and methodB will both throw a couple of types of exceptions, and some exceptions are of the same type, some are not, so what's the best practice to handle this?

Dropdown menu behind text

css z-index

I tried to create a drop down menu. That's what I did so far: