# PRAW Environment Variables

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.