RVM

Assumed knowledge

• Don't type in the <> Just put whatever you want to use in there like the particular Rails version.
• Don't type in the $ This means type it in your terminal.

$ rvm list - lists rubies

    rvm rubies

     ruby-1.9.3-p545 [ x86_64 ]
     ruby-2.0.0-p451 [ x86_64 ]
     =* ruby-2.1.1 [ x86_64 ]
     # => - current    # =* - current && default    # * - default

$ rvm use ruby 2.1.0-p547  (p means patch)

$ rvm gemset list

   gemsets for ruby-2.1.1 (found in /home/user/.rvm/gems/ruby-2.1.1)
   (default)
   global

L
  rvm gemset use <rails 4.0>

rvm gemset create <name> - (for example: name = rails -v 4.0.4)
L
  rvm gemset use

rvm install
L
  rvm use <ruby>