ruby script/plugin install ...

I am trying to migrate a rails app from the rails 2.x world (which was the last time I worked with rails) and I’m trying to run the command:

ruby script/plugin install git://github.com/activescaffold/active_scaffold.git --force

which returns:

/home/user/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:53:in require': cannot load such file -- script/../config/boot (LoadError) from /home/user/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:53:in require’
from script/plugin:2:in `’

evidently this command is deprecated in ruby 2.0.0p247 (with rails 4.0.0). Can anyone tell me how this command might be specified nowadays (under ruby 2.0.0 ?). Thanks, RVic