rack doesn't identified as a command in rails4

Question

I have a rails4 project gem 'rails', '4.0.2', and I have created a custom rack module in config/initializers/request_timer.rb, from Ryan bates screencast

but when I run the command rack middleware, inside my project, it says

-bash: rack: command not found

I havent add the rack gem to my Gemfile and I believe it should come with rails by default.

Following is my Gemfile

source 'https://rubygems.org'

gem 'rails', '4.0.2'

gem 'sqlite3'

gem 'sass-rails', '~> 4.0.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'

gem 'jbuilder', '~> 1.2'

group :doc do
  gem 'sdoc', require: false
end

any help would be appreciated

Answer 1

http://guides.rubyonrails.org/rails_on_rack.html

Try:

rake middleware

Am not sure if that is what you're after