execute

# File lib/rubygems/commands/setup_command.rb, line 82
  def execute
    @verbose = Gem.configuration.really_verbose

    install_destdir = options[:destdir]

    unless install_destdir.empty? then
      ENV['GEM_HOME'] ||= File.join(install_destdir,
                                    Gem.default_dir.gsub(/^[a-zA-Z]:/, ''))
    end

    check_ruby_version

    require 'fileutils'
    if Gem.configuration.really_verbose then
      extend FileUtils::Verbose
    else
      extend FileUtils
    end

    lib_dir, bin_dir = make_destination_dirs install_destdir

    install_lib lib_dir

    install_executables bin_dir

    remove_old_bin_files bin_dir

    say "RubyGems #{Gem::VERSION} installed"

    uninstall_old_gemcutter

    install_rdoc

    say
    if @verbose then
      say "-" * 78
      say
    end

    release_notes = File.join Dir.pwd, 'History.txt'

    release_notes = if File.exist? release_notes then
                      open release_notes do |io|
                        text = io.gets '==='
                        text << io.gets('===')
                        text[0...-3].sub(/^# coding:.*?^=/, '')
                      end
                    else
                      "Oh-no! Unable to find release notes!"
                    end

    say release_notes

    say
    say "-" * 78
    say

    say "RubyGems installed the following executables:"
    say @bin_file_names.map { |name| "\t#{name}\n" }
    say

    unless @bin_file_names.grep(/#{File::SEPARATOR}gem$/) then
      say "If `gem` was installed by a previous RubyGems installation, you may need"
      say "to remove it by hand."
      say
    end
  end