ruby -ryaml -e "File.open('config/database.yml') { |f| puts YAML.load(f).inspect }"
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ruby -ryaml -e "File.open('config/database.yml') { |f| puts YAML.load(f).inspect }"
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ruby -ryaml -e "p YAML.load(File.read('config/database.yml'))"
or
ruby -Iconfig -renvironment -e "p ActiveRecord::Base.connection"