def get_variables
      return unless File.exists?(ENV_FILE)

      File.open(ENV_FILE).each do |line|
        var_name = line.split("=").first
        yield var_name unless line =~ /^\#/
      end
    end
def get_variables
      return unless File.exists?(ENV_FILE)

      File.open(ENV_FILE).each do |line|
        var_name = line.split("=").first
        yield var_name unless line =~ /^\#/
      end
    end
build a list of variables from ENV_FILE and yeilds it