These are the ones I use the most, hope it can help.
Backup a Database
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Backup Database from the prompt-
mysqldump -u(databaseusername) -p(databasepassword) (databasename)>backupfile.sql
Example-
mysqldump -uocsfoundation -ppassword forums>forumsbackup.sql
Import a Database
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Mysql Input
mysql -u(user) -p(password) (databasename)<(backupfile.sql)
mysql -uocsfoundation -ppassword forums<forumsbackup.sql
(Note: your database should be empty first)