Multiple versions of ruby without RVM

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http://askubuntu.com – I have been trying to understand RVM and decided to do so by not using it and seeing the consequences. I am trying to see how I can manage different versions of ruby and their gemsets without RVM. I compiled Ruby 1.9.1 from source on my Ubuntu machine and found it in the path usr/local/bin/ruby. On saying ruby -v, I got the recently installed version. I did the same with Ruby 1.8.7 and upon doing a whereis ruby, got the following output : usr/local/bin/ruby usr/local/lib/ruby When I say which ruby, I get the usr/local/bin/ruby path. The contents of usr/local/bin/ruby were the same as be (HowTos)