RVM : Ruby Version Manager : A Complete Guide

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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 \
      --with-iconv-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 \
      --with-iconv-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
  


.rvmrc



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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