PRAW Environment Variables
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The second-highest priority configuration options can be passed to a
program via environment variables prefixed with "praw_".

For example, you can invoke your script as follows:

   praw_username=bboe praw_password=not_my_password python my_script.py

The "username" and "password" provided via environment variables will
override any values contained in a "praw.ini" file., but not any
variables passed in through "Reddit".

All Configuration Options can be provided in this manner, except for
custom options.
