Generates a new secret token in a Rails app

rails_generate_secret_token.sh

# This oneliner generates a new secret_token.rb file, 
# just paste it in your terminal at the root of your project
# and it will take care of the rest.
echo "$(rails r "p Rails.application.class.parent_name" | sed "s/\"//g")::Application.config.secret_token = '$(rake secret)'" > ./config/initializers/secret_token.rb

You can also run the no-magic version and just replace MyApp with the name of your app.

echo "MyApp::Application.config.secret_token = '$(rake secret)'" > ./config/initializers/secret_token.rb