Export
In order to export the database from mysql,Open your terminal and type the following command.
mysqldump -u [your_username] -p[your_database_password] [database_name] > path_to_your_directory/[database name].sql
Incase of database from remote server.
mysqldump -u [your_username] -p[your_database_password] -h [your_host_name] [database_name] > path_to_your_directory/[database_name].sql
Import
In order to import the database to mysql,Open your terminal and first you need to create database.
To create database use following command.
CREATE DATABASE database_name;
Now import the database to newly created database using following command.
mysql -u [username] -p database_name < [database_name].sql
In case for remote database host.
mysql -u [username] -p -h [your_host_name] -D database_name < [your_sql_file].sql