I’m fed-up with forgetting the simple syntax for this!
useradd -c “<comment about user>” -d <home_directory> -m -s /bin/bash -g <primary_group> -G <secondary_groups, comma delimited> <user_id>
BEA docs on creating a domain in Weblogic 8.1
http://edocs.bea.com/wls/docs81/adminguide/createdomain.html