# File lib/rubygems/command.rb, line 63
    def get_all_gem_names
      args = options[:args]

      if args.nil? or args.empty? then
        raise Gem::CommandLineError,
              "Please specify at least one gem name (e.g. gem build GEMNAME)"
      end

      gem_names = args.select { |arg| arg !~ /^-/ }
    end