exit status

steven@steven-laptop ~/refinerycms/master $ irb
ruby-1.9.2-p0 > `false`
 => "" 
ruby-1.9.2-p0 > $?.to_i
 => 256 
ruby-1.9.2-p0 > `rails new` # empty
Options should be given after the application name. For details run: rails --help
 => "" 
ruby-1.9.2-p0 > $?.to_i
 => 0 
ruby-1.9.2-p0 > `rails new test` # reserved word
Invalid application name test. Please give a name which does not match one of the reserved rails words.
 => "" 
ruby-1.9.2-p0 > $?.to_i
 => 0 
ruby-1.9.2-p0 > `rails new my_app` # good
 => "\e[1m\e[32m      create\e[0m  \n\e[1m\e[32m      create\e[0m  README\n\e[1m\e[32m      create\e[0m  Rakefile\n\e[1m\e[32m      create\e[0m  config.ru\n\e[1m\e[32m      create\e[0m  .gitignore\n\e[1m\e[32m      create\e[0m  Gemfile\n\e[1m\e[32m      create\e[0m  app\n\e[1m\e[32m      create\e[0m  app/views/layouts/application.html.erb\n\e[1m\e[32m      create\e[0m  app/helpers/application_helper.rb\n\e[1m\e[32m      create\e[0m  app/controllers/application_controller.rb\n\e[1m\e[32m      create\e[0m  app/models\n\e[1m\e[32m      create\e[0m  app/mailers\n\e[1m\e[32m      create\e[0m  config\n\e[1m\e[32m      create\e[0m  config/routes.rb\n\e[1m\e[32m      create\e[0m  config/application.rb\n\e[1m\e[32m      create\e[0m  config/environment.rb\n\e[1m\e[32m      create\e[0m  config/environments\n\e[1m\e[32m      create\e[0m  config/environments/test.rb\n\e[1m\e[32m      create\e[0m  config/environments/production.rb\n\e[1m\e[32m      create\e[0m  config/environments/development.rb\n\e[1m\e[32m      create\e[0m  config/initializers\n\e[1m\e[32m      create\e[0m  config/initializers/session_store.rb\n\e[1m\e[32m      create\e[0m  config/initializers/mime_types.rb\n\e[1m\e[32m      create\e[0m  config/initializers/backtrace_silencers.rb\n\e[1m\e[32m      create\e[0m  config/initializers/secret_token.rb\n\e[1m\e[32m      create\e[0m  config/initializers/inflections.rb\n\e[1m\e[32m      create\e[0m  config/locales\n\e[1m\e[32m      create\e[0m  config/locales/en.yml\n\e[1m\e[32m      create\e[0m  config/boot.rb\n\e[1m\e[32m      create\e[0m  config/database.yml\n\e[1m\e[32m      create\e[0m  db\n\e[1m\e[32m      create\e[0m  db/seeds.rb\n\e[1m\e[32m      create\e[0m  doc\n\e[1m\e[32m      create\e[0m  doc/README_FOR_APP\n\e[1m\e[32m      create\e[0m  lib\n\e[1m\e[32m      create\e[0m  lib/tasks\n\e[1m\e[32m      create\e[0m  lib/tasks/.gitkeep\n\e[1m\e[32m      create\e[0m  log\n\e[1m\e[32m      create\e[0m  log/server.log\n\e[1m\e[32m      create\e[0m  log/production.log\n\e[1m\e[32m      create\e[0m  log/development.log\n\e[1m\e[32m      create\e[0m  log/test.log\n\e[1m\e[32m      create\e[0m  public\n\e[1m\e[32m      create\e[0m  public/500.html\n\e[1m\e[32m      create\e[0m  public/robots.txt\n\e[1m\e[32m      create\e[0m  public/favicon.ico\n\e[1m\e[32m      create\e[0m  public/404.html\n\e[1m\e[32m      create\e[0m  public/index.html\n\e[1m\e[32m      create\e[0m  public/422.html\n\e[1m\e[32m      create\e[0m  public/images\n\e[1m\e[32m      create\e[0m  public/images/rails.png\n\e[1m\e[32m      create\e[0m  public/stylesheets\n\e[1m\e[32m      create\e[0m  public/stylesheets/.gitkeep\n\e[1m\e[32m      create\e[0m  public/javascripts\n\e[1m\e[32m      create\e[0m  public/javascripts/application.js\n\e[1m\e[32m      create\e[0m  public/javascripts/controls.js\n\e[1m\e[32m      create\e[0m  public/javascripts/effects.js\n\e[1m\e[32m      create\e[0m  public/javascripts/prototype.js\n\e[1m\e[32m      create\e[0m  public/javascripts/rails.js\n\e[1m\e[32m      create\e[0m  public/javascripts/dragdrop.js\n\e[1m\e[32m      create\e[0m  script\n\e[1m\e[32m      create\e[0m  script/rails\n\e[1m\e[32m      create\e[0m  test\n\e[1m\e[32m      create\e[0m  test/performance/browsing_test.rb\n\e[1m\e[32m      create\e[0m  test/test_helper.rb\n\e[1m\e[32m      create\e[0m  test/functional\n\e[1m\e[32m      create\e[0m  test/integration\n\e[1m\e[32m      create\e[0m  test/fixtures\n\e[1m\e[32m      create\e[0m  test/unit\n\e[1m\e[32m      create\e[0m  tmp\n\e[1m\e[32m      create\e[0m  tmp/sessions\n\e[1m\e[32m      create\e[0m  tmp/sockets\n\e[1m\e[32m      create\e[0m  tmp/cache\n\e[1m\e[32m      create\e[0m  tmp/pids\n\e[1m\e[32m      create\e[0m  vendor/plugins\n\e[1m\e[32m      create\e[0m  vendor/plugins/.gitkeep\n" 
ruby-1.9.2-p0 > $?.to_i
 => 0 
ruby-1.9.2-p0 > exit