# File lib/chef/knife/role_show.rb, line 34
      def run 
        @role_name = @name_args[0]

        if @role_name.nil?
          show_usage
          Chef::Log.fatal("You must specify a role name")
          exit 1
        end
        
        role = Chef::Role.load(@role_name)
        output(format_for_display(role))
      end