RVM

[~@rish]ruby -v
ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]
[~@rish]echo $GEM_HOME

[~@rish]rvm 1.9.2
[~@rish]ruby -v
ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.6.0]
[~@rish]which ruby irb rake gem
/Users/rish/.rvm/rubies/ruby-1.9.2-p180/bin/ruby
/Users/rish/.rvm/rubies/ruby-1.9.2-p180/bin/irb
/Users/rish/.rvm/gems/ruby-1.9.2-p180/bin/rake
/Users/rish/.rvm/rubies/ruby-1.9.2-p180/bin/gem
[~@rish]ruby -v
ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.6.0]
[~@rish]echo $GEM_HOME
/Users/rish/.rvm/gems/ruby-1.9.2-p180
[~@rish]echo $GEM_PATH
/Users/rish/.rvm/gems/ruby-1.9.2-p180:/Users/rish/.rvm/gems/ruby-1.9.2-p180@global
[~@rish]rvm 1.9.2 --default

RVMはどうも苦手意識があったけど、逆にカオス化していたRuby環境がすっきりして良かった。