The upgrade command was originally created with the intention of being
able to automate some of the upgrade process, as the number of plugins
and the complexity of the upgrade process increased we realised it
wasn't go to be able to meet users expectations and we shifted most of
the upgrade information to the documentation making the name 'upgrade'
for the command no longer suitable. The only useful functionality of
'upgrade' is to set the Grails version and hence it has been replaced
by 'set-grails-version'
Cheers
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Graeme Rocher
Grails Project Lead
Pivotal