/applications/MAMP/library/bin/mysql -u root -p wordpress_db < /Applications/MAMP/htdocs/backupDB.sql

UPDATE wp_options SET option_value="http://newdomain.com" WHERE option_name="siteurl";
UPDATE wp_options SET option_value="http://newdomain.com" WHERE option_name="home";
UPDATE wp_options SET option_value = replace(option_value, 'http://olddomain.com', 'http://newdomain.com') WHERE option_name = 'home' OR option_name = 'siteurl';
UPDATE wp_posts SET guid = replace(guid, 'http://olddomain.com','http://newdomain.com');
UPDATE wp_posts SET post_content = replace(post_content, 'http://olddomain.com', 'http://newdomain.com');
UPDATE wp_postmeta SET meta_value = replace(meta_value, 'http://olddomain.com', 'http://newdomain.com');

define( 'DB_NAME', 'wordpress_db' );  // only if you changed db name (don't)
define( 'DB_USER', 'root' );
define( 'DB_PASSWORD', 'root' );
define( 'DB_HOST', 'localhost' );

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /your_site/index.php [L]
</IfModule>