[CentOS] A full detailed add user script

Anyone here have any sample script, using BASH, for adding user. The 
script can define:
- home directory
- quota
- create public_html folder
- update shadow password (in replace to manually using passwd 
particularly to related user)

Thank you.

Dwi Suharto
Rumahweb's TSO
http://www.rumahweb.com