I had never looked deeply into automating the OBIEE Web Catalog, as on previous engagements I had a technical architecture team which handled all deployments. They were used to doing a manual process utilizing the Catalog Manager. On my latest engagement, I am the technical architecture team, and I like automation.
After poking around, I found that you can call the catalog manager form the command line, and along with WLST scripting, you can do a fully automated web catalog deployment.
After the jump is a script which can be used to do OBIEE 11g web catalog deployments. This script assumes you have setup ssh keys on the various servers so you can login without typing a password (http://www.linuxproblem.org/art_9.html).