This was written using webgui 7.4.40, wre .8.4
It's as simple as promised:
It'll do all the stuff for you:
--adminPassword The password for the "root" in your MySQL database.
--databaseUser The username you'd like created to access this site's database.
--databasePassword The password you'd like created to access this site's database.
--databaseName The name of the database to create in MySQL (defaults to www_site_com for the domain www.site.com).
--help list of command line options
--sitename The name of the site you'd like to create. For example: www.example.com or intranet.example.com
--var0-9 A series of variables you can use to pass arbitrary information into the site creation process. These variables will be exposed to all templates used to create this site.
document the var0-9 commandline option - I didn't understand it, I didn't use it.
Keywords: add multi-site WRE