drush site install

I'm using Drupal 6.x.

While I have my own shell script that will create a new database to use with a new drupal install, I would like to do this with drush.

Drush has some sql commands, but they seem to be for post creation.

I've looked inside the drush 3 beta and found the drush_core_pre_site_install() function, but I don't see where it is exposed. I tried to guess at a command name (pre-site-install), but those attempts failed. Another function in that same file, drush_core_site_install gave me an error message that it requires Drupal 7.