mysql> grant select on *.* to ''@'%' identified by '123';
Query OK, 0 rows affected (0.00 sec)
mysql> grant select,createon *.* to 'bruce'@'10.20.0.232' identified by '123';
Query OK, 0 rows affected (0.01 sec)
mysql> grant select,create,deleteon *.* to 'bruce'@'%' identified by'123';
Query OK, 0rows affected (0.00 sec)

[root@brucetest7 ~]# mysql -ubruce -p -h10.20.0.231
Enter password: 
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.5.20-log MySQL Community Server (GPL)
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome tomodify and redistribute it under the GPL v2 license
Type 'help;' or '\h' for help. Type'\c'to clear the current inputstatement.
MySQL [(none)]> show grants;
+-------------------------------------------------------------------------------------------------------------------------+
| Grants for bruce@10.20.0.232                       |
+-------------------------------------------------------------------------------------------------------------------------+
| GRANT SELECT, CREATEON *.* TO 'bruce'@'10.20.0.232' IDENTIFIED BY PASSWORD'*23AE809DDACAF96AF0FD78ED04B6A265E05AA257' |
+-------------------------------------------------------------------------------------------------------------------------+
1 row inset (0.00 sec)
MySQL [(none)]> select user(), current_user();
+-------------------+-------------------+
| user()   | current_user() |
+-------------------+-------------------+
| bruce@10.20.0.232 | bruce@10.20.0.232 |
+-------------------+-------------------+
1 row in set (0.03 sec)

[root@brucetest7 ~]# mysql -ubruce -p -h10.20.0.231
Enter password: 
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 5.5.20-log MySQL Community Server (GPL)
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome tomodify and redistribute it under the GPL v2 license
Type 'help;' or '\h' for help. Type '\c'to clear the current inputstatement.
MySQL [(none)]> show grants;
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Grants for @%                                              |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| GRANT SELECT ON*.* TO''@'%' IDENTIFIED BY PASSWORD '*23AE809DDACAF96AF0FD78ED04B6A265E05AA257'                         |
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, REFERENCES, INDEX, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES, CREATE VIEW, SHOW VIEW, CREATEROUTINE, EVENT, TRIGGER ON `test`.* TO''@'%' |
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, REFERENCES, INDEX, ALTER, CREATETEMPORARY TABLES, LOCK TABLES, CREATE VIEW, SHOW VIEW, CREATEROUTINE, EVENT, TRIGGER ON `test\_%`.* TO''@'%' |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
MySQL [(none)]> select user(), current_user();
+-------------------+----------------+
| user()   | current_user() |
+-------------------+----------------+
| bruce@10.20.0.232 | @%    |
+-------------------+----------------+
1 row in set (0.00 sec)