update all projects maven version

[EJ Ciramella]

Is there a way to programattically update all the projects maven version
(or jdk or ant or w/e else)?
 
With cruise control, we'd just check out 20 or so <projname>.config.xml
files and just search/replace all the paths to the maven installation
directory.
 
I see the CLI bit for hudson, but not sure if this is how I should do
it.