源文件包含bash中包含“破折号”字符的环境变量的文件？

Question

I'm using bash and have a file called x.config that contains the following:

MY_VAR=Something1
ANOTHER=Something2

To load these as environment variables I just use source:

$ source x.config

But this doesn't work if MY_VAR is called MY-VAR :

MY-VAR=Something1
ANOTHER=Something2

If I do the same thing I get:

x.config:1: command not found: MY-VAR=Something1

I've tried escaping - and a lot of other things but I'm stuck. Does anyone know a workaround for this?

Answer 1

A pure bash workaround that might work for you is to re-run the script using env to set the environment. Add this to the beginning of your script.

if [[ ! -v myscript_env_set ]]; then
    export myscript_env_set=1
    readarray -t newenv < x.config
    exec env "${newenv[@]}" "$0" "$@"
fi

# rest of the script here

This assumes that x.config doesn't contain anything except variable assignments. If myscript_env_set is not in the current environment, put it there so that the next invocation skips this block. Then read the assignments into an array to pass to env . Using exec replaces the current process with another invocation of the script, but with the desired variables in the environment.

Answer 2

A dash ( - ) in an environment variable is not portable, and as you noticed, will cause a lot of problems. You can't set these from bash. Fix the application you want to invoke .

That being said, if you can't change the target app, you can do this from python:

#!/usr/bin/python

import os

with open('x.config') as f:
    for line in f:
        name, value = line.strip().split('=')
        os.environ[name] = value

os.system('/path/to/your/app')

This is a very simplistic config reader, and for a more complex syntax you might want to use ConfigParser .