Accidently I have installed both versions of ruby on my system and now the default version is set to $ ruby -v ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux] but I need to set the default version to 2.0.0... for this I used the command $ rvm 2.0.0p294 --default but it says rvm is not currently installed though I installed it, typing various commands(via google) . Also I want to install an Integrated Ruby shell in ubuntu 13.04, do suggest how to do it. I have also installed Aptana Studio on my system, now how should I get started with it. Finally, the last problem is tell me how to check whether rails is currently installed in my system or not... Thanx in advance!!
to use a gemset try writing rvm use ruby_gemset_version
to check the rails version try to type rails -v