RVM : Ruby Version Manager : A Complete Guide

Install RVM
bash < <( curl http://rvm.beginrescueend.com/releases/rvm-install-head ) 
Show all rubies and gemsets
rvm list gemsets

Upgrade to the latest version of rvm from github
rvm update --head
Ruby on Rails 3 Tutorial says to follow this with
    rvm reload
    rvm install 1.8.7
    rvm install 1.9.2

and, if you need a patchlevel, do something like
    rvm install 1.8.7-p174
Install a given version of ruby

    rvm install 1.9.2

If this fails with compiler errors, you may need to install some packages.
    rvm package install openssl
    rvm package install readline
    rvm package install iconv
    rvm install 1.9.2 --with-openssl-dir=$HOME/.rvm/usr \
      --with-readline-dir=$HOME/.rvm/usr \
  On Mac, you may need to install some libraries via MacPorts.
    sudo port install ncurses
    sudo port install libyaml
    sudo port install zlib  
    rvm install 1.9.2 --with-libyaml-dir=/opt/local \
      --with-openssl-dir=$HOME/.rvm/usr \
      --with-readline-dir=$HOME/.rvm/usr \
  On Linux
    sudo apt-get install git-core git curl file   \
                  gcc make automake autoconf automake1.9 \
                  binutils g++ g++-multilib checkinstall
    sudo apt-get install libssl-dev libxslt-dev libxml2-dev
    sudo apt-get install libcurl4-openssl-dev libmysql++-dev
    sudo apt-get install libpcre3 libpcre3-dev
Open a new shell and rvm!

    rvm use 1.9.1 

    >> Switching to ruby 1.9.1 ... 
    ruby -v 
    >> ruby 1.9.1p243 (2009-07-16 revision 24175) [x86_64-linux] 
    which ruby 
    >> /home/wayne/.rvm/ruby-1.9.1-p243/bin/ruby
Make 1.9.2 default for all new shells

    rvm --default 1.9.2

Reverting to system default

    rvm system
    ruby -v 
    >> ruby 1.8.7 (2008-08-11 patchlevel 72) [universal-darwin10.0] 
    which ruby 
    >> /usr/bin/ruby
Installing gems in multiple ruby versions

    rvm 1.8.6,1.9.1 gem install rspec json --no-rdoc --no-ri
Starting a new project? Create a Gemset and rvmrc at the same time:

    rvm --create --rvmrc ree@project_name
Working with gemsets

    rvm 1.8.7                       # use the ruby to manage gemsets for
    rvm gemset create project_name  # create a gemset
    rvm gemset use project_name     # use a gemset in this ruby
    rvm gemset list                 # list gemsets in this ruby
    rvm gemset delete project_name  # delete a gemset
    rvm 1.9.1@other_project_name    # use another ruby and gemset
The global gemset

With every ruby, rvm creates the global gemset.  Gems installed into this
gemset are available to all gemsets in the ruby.
      rvm 1.8.7
      rvm gemset create project_name
      gem list # no gems :(
      rvm gemset use global
      gem install rake
      rvm gemset use project_name
      gem list # rake :)

Install a gem directly into the global gemset:
      rvm 1.8.7@global gem install shoulda

rvm can automatically use a ruby and gemset when you cd to a project directory.
    echo "rvm 1.8.7@project_name" > ~/projects/project_name/.rvmrc


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