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I have 2 different Rails Rubygems installed on my Linux OS [2.3.8 and 3.0.3], but the current active Rails version is 3.0.3. So is it possible to generate Rails app using 2.3.8 style generator:rails testapp not new one: rails new testapp?
I’d recommend installing RVM and setting up different gemsets for each version of Rails. That way you can easily switch between Rails versions by just switching gemsets.