If you are using drupal, you must have heard of drush, if not check it now, its the one of the awesomest thing in drupal.More links
Now i suppose you have drush installed on your system. So you can install drupal in three easy steps.
Drush dl drupal
mv drupal-7.x your_site_name && cd your_site_name
drush si --db-url=mysql://mysql_username:firstname.lastname@example.org/db_name --account-name=you_choose --account-pass=you_choose --account-email=your_email --locale=pt_br --site-name="Drupal Test"