SHOW GRANTS

mysql> SHOW GRANTS;
+-------------------------------------------+
| Grants for User                           |
+-------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' |
+-------------------------------------------+
1 row in set (0.00 sec)

mysql> SHOW GRANTS FOR 'u1';
ERROR 1141 (42000): There is no such grant defined for user 'u1' on host '%'
mysql> CREATE USER u1;
Query OK, 1 row affected (0.04 sec)

mysql> GRANT SELECT ON test.* TO u1;
Query OK, 0 rows affected (0.04 sec)

mysql> SHOW GRANTS FOR u1;
+------------------------------------+
| Grants for u1@%                    |
+------------------------------------+
| GRANT USAGE ON *.* TO 'u1'@'%'     |
| GRANT Select ON test.* TO 'u1'@'%' |
+------------------------------------+
2 rows in set (0.00 sec)