虎搞瞎搞

依照以下語法執行

ubuntu 系統更新
$ sudo apt-get update
$ sudo apt-get upgrade

安裝套件
$ sudo apt-get install build-essential bison openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev autoconf libc6-dev
下載ruby 
$ wget http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gz
編譯ruby
$ tar xvfz ruby-2.1.5.tar.gz
$ cd ruby-2.1.5/
$ ./configure
$ make
安裝ruby 
$ sudo make install
測試ruby 安裝有否成功
$ git --version
$ ruby -v
設定gem不產生文件
echo 'gem: --no-ri --no-rdoc' >> ~/.gemrc
安裝rails
$ sudo gem install rails