execute (Gem::Commands::EnvironmentCommand)

    # File lib/rubygems/commands/environment_command.rb, line 26
      def execute
        out = ''
        arg = options[:args][0]
        if begins?("packageversion", arg) then
          out << Gem::RubyGemsPackageVersion
        elsif begins?("version", arg) then
          out << Gem::RubyGemsVersion
        elsif begins?("gemdir", arg) then
          out << Gem.dir
        elsif begins?("gempath", arg) then
          out << Gem.path.join("\n")
        elsif begins?("remotesources", arg) then
          out << Gem.sources.join("\n")
        elsif arg then
          fail Gem::CommandLineError, "Unknown enviroment option [#{arg}]"
        else
          out = "RubyGems Environment:\n"

          out << "  - RUBYGEMS VERSION: #{Gem::RubyGemsVersion} (#{Gem::RubyGemsPackageVersion})\n"

          out << "  - RUBY VERSION: #{RUBY_VERSION} (#{RUBY_RELEASE_DATE}"
          out << " patchlevel #{RUBY_PATCHLEVEL}" if defined? RUBY_PATCHLEVEL
          out << ") [#{RUBY_PLATFORM}]\n"

          out << "  - INSTALLATION DIRECTORY: #{Gem.dir}\n"

          out << "  - RUBYGEMS PREFIX: #{Gem.prefix}\n" unless Gem.prefix.nil?

          out << "  - RUBY EXECUTABLE: #{Gem.ruby}\n"

          out << "  - RUBYGEMS PLATFORMS:\n"
          Gem.platforms.each do |platform|
            out << "    - #{platform}\n"
          end

          out << "  - GEM PATHS:\n"
          Gem.path.each do |p|
            out << "     - #{p}\n"
          end

          out << "  - GEM CONFIGURATION:\n"
          Gem.configuration.each do |name, value|
            out << "     - #{name.inspect} => #{value.inspect}\n"
          end

          out << "  - REMOTE SOURCES:\n"
          Gem.sources.each do |s|
            out << "     - #{s}\n"
          end
        end
        say out
        true
      end