execute

# File lib/rubygems/commands/environment_command.rb, line 64
  def execute
    out = ''
    arg = options[:args][0]
    case arg
    when /^packageversion/ then
      out << Gem::RubyGemsPackageVersion
    when /^version/ then
      out << Gem::VERSION
    when /^gemdir/, /^gemhome/, /^home/, /^GEM_HOME/ then
      out << Gem.dir
    when /^gempath/, /^path/, /^GEM_PATH/ then
      out << Gem.path.join(File::PATH_SEPARATOR)
    when /^remotesources/ then
      out << Gem.sources.join("\n")
    when /^platform/ then
      out << Gem.platforms.join(File::PATH_SEPARATOR)
    when nil then
      out = "RubyGems Environment:\n"

      out << "  - RUBYGEMS VERSION: #{Gem::VERSION}\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 << "  - EXECUTABLE DIRECTORY: #{Gem.bindir}\n"

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

      out << "  - GEM PATHS:\n"
      out << "     - #{Gem.dir}\n"

      path = Gem.path.dup
      path.delete Gem.dir
      path.each do |p|
        out << "     - #{p}\n"
      end

      out << "  - GEM CONFIGURATION:\n"
      Gem.configuration.each do |name, value|
        value = value.gsub(/./, '*') if name == 'gemcutter_key'
        out << "     - #{name.inspect} => #{value.inspect}\n"
      end

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

    else
      raise Gem::CommandLineError, "Unknown environment option [#{arg}]"
    end
    say out
    true
  end