anchor.diff:      _ = leo_manager_mnesia:insert_history(Command),
       Reply = case string:tokens(binary_to_list(Option), ?COMMAND_DELIMITER) of
                   [] ->
  -                    io_lib:format("[ERROR] ~s\r\n",[?ERROR_COMMAND_NOT_FOUND]);
  +                    io_lib:format("[ERROR] ~s\r\n",[?ERROR_NO_PATH_SPECIFIED]);
                   [Key|_] ->
                       case catch leo_manager_api:purge(Key) of
                           ok ->
  
positive.code: -define(ERROR_COULD_NOT_DETACH_NODE, "could not detach a node").
  -define(ERROR_COMMAND_NOT_FOUND,     "command not exist").
  -define(ERROR_NO_NODE_SPECIFIED,     "no node specified").
  
  
  %%----------------------------------------------------------------------
  
negative.code:     {Reply, NewState} =
          case string:tokens(binary_to_list(Option), ?COMMAND_DELIMITER) of
              [] ->
                  {io_lib:format("[ERROR] ~s\r\n",["no user specified"]),State};
              [UserId|_] ->
                  case leo_s3_auth:gen_key(UserId) of
                      {ok, Keys} ->
  