How do I see the ENV vars in a Rails app?

Assuming the staging environment, as your example points to. You'll want to load the console by prepending the RAILS_ENV environment variable to the rails console command.

RAILS_ENV=staging rails console

That should get you in. Once you're in, you can just access the ENV variable directly.

2.2.2 (main):0 > ENV

And that will dump out the environment variables for you. Note, your prompt may look different. If you want to access a specific value, such as the database password, you can:

2.2.2 (main):0 > ENV['STAGE_DATABASE_PASSWORD']

Within your app directory, simply launch the Rails Console:

rails c

Then at the prompt:

ENV

This will list all loaded environmental variables for whichever environment you last exported.

Sorry, after posting this, I realized that the author had already tried to use rails console with errors...but I am fairly sure this should always work. You can't ask for printenv or env within the console, you must use all caps "ENV"