gem
$ sudo gem install rvm Password: ******************************************************************************* This gem contains only the Ruby libraries for the RVM Ruby API. In order to install RVM please use one of the methods listed i…
$ gem list rails *** LOCAL GEMS *** rails (3.0.1, 3.0.0, 2.3.5, 2.2.2, 1.2.6)$ rails -v Rails 3.0.1$ rails _2.3.5_ -v Rails 2.3.5$ alias rails2='rails _2.3.5_' $ rails2 -v Rails 2.3.5