MySQL: How to export and import an .sql file from command line?

<?php

set_time_limit(0);
exec("mysqldump -u root -pPASSWORD databasename | gzip > dump.sql.gz");
?>

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To EXPORT

   
If it's an entire DB, then:
$ mysqldump -u [uname] -p[pass] db_name > db_backup.sql


If it's all DBs, then:
$ mysqldump -u [uname] -p[pass] --all-databases > all_db_backup.sql


If it's specific tables within a DB, then:
$ mysqldump -u [uname] -p[pass] db_name table1 table2 > table_backup.sql


You can even go as far as auto-compressing the output using gzip (if your DB is very big):
$ mysqldump -u [uname] -p[pass] db_name | gzip > db_backup.sql.gz


If you want to do this remotely and you have the access to the server in question, then the following would work (presuming the MySQL server is on port 3306):

$ mysqldump -P 3306 -h [ip_address] -u [uname] -p[pass] db_name > db_backup.sql

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To import

Type the following command to import sql data file:
$ mysql -u username -p -h localhost DATA-BASE-NAME < data.sql


In this example, import 'data.sql' file into 'blog' database using Sathish as username:
$ mysql -u sat -p -h localhost blog < data.sql


If you have a dedicated database server, replace localhost hostname with with actual server name or IP address as follows:
$ mysql -u username -p -h 202.54.1.10 databasename < data.sql


OR use hostname such as mysql.cyberciti.biz
$ mysql -u username -p -h mysql.cyberciti.biz database-name < data.sql



If you do not know the database name or database name is included in sql dump you can try out something as follows:
$ mysql -u username -p -h 202.54.1.10 < data.sql

Refer: http://dev.mysql.com/doc/refman/5.6/en/mysqldump.html