# File lib/rubygems/gem_commands.rb, line 22
    def get_one_gem_name
      args = options[:args]
      if args.nil? or args.empty?
        fail Gem::CommandLineError,
          "Please specify a gem name on the command line (e.g. gem build GEMNAME)"
      end
      if args.size > 1
        fail Gem::CommandLineError,
          "Too many gem names (#{args.join(', ')}); please specify only one"
      end
      args.first
    end