to "export", type:
mysqldump -u<username> -p<your_password> <database_name> > output_file
eg. username=dolphin, password=passwd, database_name=whale, I would type:
mysqldump -udolphin -ppasswd whale > whaleDB.sql
Then, to "import", type the following:
mysql -udolphin -ppasswd whale < whaleDB.sql