mysql> SELECT USER(),CURRENT_USER();

| USER()          | CURRENT_USER() | apple@localhost | @localhost     |1 row in set (0.00 sec)

mysql> SHOW GRANTS FOR 'apple'@'localhost';

--------------------
Connection:
Name: LOCAL
Host: localhost (UNIX socket)
Server: MySQL Community Server (GPL)
Version: 5.6.16
Login User: apple
Current User: @localhost

Shell> mysql --user=user_name --password=your_password db_name