wget ftp://ftp.ruby-lang.org:21//pub/ruby/1.9/ruby-1.9.2-p180.tar.gz
tar -zxvf ruby-1.9.2-p180.tar.gz
cd ruby-1.9.2-p180
./configure --prefix=/usr/local/ruby-1.9.2-p180
make
sudo make install
export PATH=/usr/local/ruby-1.9.2-p180/bin:$PATH
echo export PATH=/usr/local/ruby-1.9.2-p180/bin:$PATH >> ~/.profile
sudo gem i passenger
sudo passenger-install-nginx-module
sudo gem i rails
sudo gem i sqlite3
rails new demo -d sqlite3