To use the MySQL command line with MAMP or MAMP PRO, perform the following steps:

Using MySQL command line with MAMP

-- 1.- Start MAMP or MAMP PRO
-- 2.- Start the server
-- 3.- Open Terminal (Applications -> Utilities)
-- 4.- Type in: (one line)
/Applications/MAMP/Library/bin/mysql --host=localhost -uroot -proot

-- select database
mysql> use DATABASE_NAME;

-- select sql
mysql> source path/to/file.sql;