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'