mysql -u username -p database_name < file.sql
Check MySQL Options.
Note-1: It is better to use the full path of the SQL file
--triggers to keep the routines and triggers of original database. They are not copied by default.
Note-3 You may have to create the (empty) database from mysql if it doesn't exist already and the exported SQL don't contain
CREATE DATABASE (exported with
-n option), before you can import it.