Syntax:
SHOW GRANTS [FOR user]

This statement displays the privileges that are assigned to a MySQL
user account, in the form of GRANT statements that must be executed to
duplicate the privilege assignments.

SHOW GRANTS requires the SELECT privilege for the mysql system
database, except to display privileges for the current user. For output
that includes an IDENTIFIED BY PASSWORD clause displaying an account
password hash value, the SUPER privilege is required to see the actual
hash value. Otherwise, the value displays as <secret>.

To name the account for SHOW GRANTS, use the same format as for the
GRANT statement; for example, 'jeffrey'@'localhost':

mysql> SHOW GRANTS FOR 'jeffrey'@'localhost';
+------------------------------------------------------------------+
| Grants for jeffrey@localhost                                     |
+------------------------------------------------------------------+
| GRANT USAGE ON *.* TO `jeffrey`@`localhost`                      |
| GRANT SELECT, INSERT, UPDATE ON `db1`.* TO `jeffrey`@`localhost` |
+------------------------------------------------------------------+

The host part, if omitted, defaults to '%'. For additional information
about specifying account names, see
http://dev.mysql.com/doc/refman/5.5/en/account-names.html.

To display the privileges granted to the current user (the account you
are using to connect to the server), you can use any of the following
statements:

SHOW GRANTS;
SHOW GRANTS FOR CURRENT_USER;
SHOW GRANTS FOR CURRENT_USER();

If SHOW GRANTS FOR CURRENT_USER (or any of the equivalent syntaxes) is
used in definer context, such as within a stored procedure that
executes with definer rather than invoker privileges), the grants
displayed are those of the definer and not the invoker.

SHOW GRANTS does not display privileges that are available to the named
account but are granted to a different account. For example, if an
anonymous account exists, the named account might be able to use its
privileges, but SHOW GRANTS does not display them.

URL: http://dev.mysql.com/doc/refman/5.5/en/show-grants.html

