PURGE {MASTER | BINARY} LOGS TO ‘log_name'

 PURGE {MASTER | BINARY} LOGS BEFORE ‘date'

 PURGE {MASTER|BINARY} LOGS BEFORE DATE_SUB(NOW(),INTERVAL 7 DAY);

 mysql>PURGE MASTER LOGS TO ‘mysql-bin.010′;

 mysql>PURGE MASTER LOGS BEFORE ‘2008-06-22 13:00:00′;

 mysql>PURGE MASTER LOGS BEFORE DATE_SUB( NOW( ), INTERVAL 7 DAY);