ENV.include?(name) â true or false Class Public methods Returns true

ENV.to_hash â hash Class Public methods Creates a hash with a copy of the environment

ENV[name] = value Class Public methods Sets the environment variable name

ENV.has_key?(name) â true or false Class Public methods Returns true

ENV.values â Array Class Public methods Returns every environment variable

ENV.rassoc(value) Class Public methods Returns an Array of the name and value

ENV.update(hash) â HashENV.update(hash) { |name, old_value, new_value| } â Hash

ENV.keys â Array Class Public methods Returns every environment variable name

ENV.clear Class Public methods Removes every environment variable.

ENV.empty? â true or false Class Public methods Returns true when there are