使用rvm在Mac中安装ruby和rails

bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)

cd ~/
sudo vim .bash_profile
 
#在.bash_profile中加入
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"  # This loads RVM into a shell session.

$ rvm list known
# MRI Rubies
1.8.6[-p420]
1.8.6-head
1.8.7[-p352]
1.8.7-head
1.9.1-p378
1.9.1[-p431]
1.9.1-head
1.9.2-p180
1.9.2[-p290]
1.9.2-head
ruby-head
...

rvm install 1.9.2

$rvm use 1.9.2
Using /Users/elton/.rvm/gems/ruby-1.9.2-p290
$ruby -v
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin11.1.0]

rvm --default use 1.9.2

gem install rails