-grant all privileges on *.* to kern@localhost with grant option;
-grant all privileges on *.* to kern@"%" with grant option;
-grant all privileges on *.* to kelvin@localhost with grant option;
-grant all privileges on *.* to kelvin@"%" with grant option;
-grant all privileges on *.* to bacula@localhost with grant option;
-grant all privileges on *.* to bacula@"%" with grant option;
+grant all privileges on ${db_name}.* to ${USER}@localhost;
+grant all privileges on ${db_name}.* to ${USER}@"%";