Ubuntu: MySQL Export/Import all databases in CLI

To Export all your MySQL databases, do this :

mysqldump -u yourusername -p -h localhost --all-databases | gzip > filename.sql.gz

To Import all your MySQL databases, do this :

mysql -u yourusername -p -h localhost < filename.sql

Also you might wonder how I unzipped the gz file. You can do this

gunzip filename.sql.gz