# File lib/rubygems/command.rb, line 40
    def initialize(command, summary=nil, defaults={})
      @command = command
      @summary = summary
      @program_name = "gem #{command}"
      @defaults = defaults
      @options = defaults.dup
      @option_groups = Hash.new { |h,k| h[k] = [] }
      @parser = nil
      @when_invoked = nil
    end