ENV.replace(hash) â env Class Public methods Replaces the contents of the environment

ENV.keep_if { |name, value| } â HashENV.keep_if â Enumerator Class Public methods

ENV.select! { |name, value| } â ENV or nilENV.select! â Enumerator Class Public methods

ENV.size Class Public methods Returns the number of environment variables.

ENV.shift â Array or nil Class Public methods Removes an environment variable

ENV.each_value { |value| } â HashENV.each_value â Enumerator Class Public methods

ENV.fetch(name) â valueENV.fetch(name, default) â valueENV.fetch(name) { |missing_name| ... } â value

ENV.each_pair { |name, value| } â HashENV.each_pair â Enumerator Class Public methods

ENV.inspect â string Class Public methods Returns the contents of the environment

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