rails のバージョンを指定して新規アプリケーションを作成
rails _2.2.2_ <app_name>
実際の処理は下記のようになっている。
vi /usr/bin/rails 1 #!/usr/bin/ruby 2 # 3 # This file was generated by RubyGems. 4 # 5 # The application 'rails' is installed as part of a gem, and 6 # this file is here to facilitate running it. 7 # 8 9 require 'rubygems' 10 version = "> 0" 11 if ARGV.first =~ /^_(.*)_$/ and Gem::Version.correct? $1 then 12 version = $1 13 ARGV.shift 14 end 15 gem 'rails', version 16 load 'rails'