To create a dump file use the following syntax:
/var/lib/mysql # mysqldump -u root -p mysqldatabase > backup.sql
You will be prompted for the password and the backup file will be created.
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To restore a backup dump file use the following syntax:
/var/lib/mysql # mysql -u root -p mysqldatabase < backup.sql
You will be promted for the password and the backup will be restored.