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$ rails new commandsapp
    create
    create README.rdoc
    create Rakefile
    create config.ru
    create .gitignore
    create Gemfile
    create app
    ...
    create  tmp/cache
    ...
        run bundle install

$ cd commandsapp
$ bin/rails server
=> Booting WEBrick
=> Rails 4.2.0 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2013-08-07 02:00:01] INFO  WEBrick 1.3.1
[2013-08-07 02:00:01] INFO  ruby 2.0.0 (2013-06-27) [x86_64-darwin11.2.0]
[2013-08-07 02:00:01] INFO  WEBrick::HTTPServer#start: pid=69680 port=3000

$ bin/rails server -e production -p 4000

$ bin/rails generate
Usage: rails generate GENERATOR [args] [options]

...
...

Please choose a generator below.

Rails:
  assets
  controller
  generator
  ...
  ...

$ bin/rails generate controller
Usage: rails generate controller NAME [action action] [options]

    ...
    ...

    Description:
    ...

    To create a controller within a module, specify the controller name as a path like 'parent_module/controller_name'.

    ...

Example:
    `rails generate controller CreditCards open debit credit close`

    Credit card controller with URLs like /credit_cards/debit.
        Controller: app/controllers/credit_cards_controller.rb
        Test:       test/controllers/credit_cards_controller_test.rb
        Views:      app/views/credit_cards/debit.html.erb [...]
        Helper:     app/helpers/credit_cards_helper.rb

$ bin/rails generate controller Greetings hello
     create  app/controllers/greetings_controller.rb
      route  get "greetings/hello"
     invoke    erb 
     create    app/views/greetings
     create    app/views/greetings/hello.html.erb
     invoke  test_unit
     create    test/controllers/greetings_controller_test.rb
     invoke  helper
     create    app/helpers/greetings_helper.rb
     invoke  assets
     invoke    coffee
     create      app/assets/javascripts/greetings.js.coffee
     invoke    scss
     create      app/assets/stylesheets/greetings.css.scss

class GreetingsController < ApplicationController
  def hello
    @message = "Hello, how are you today?"
  end 
end 

<h1>A Greeting for You!</h1>
<p><%= @message %></p>

$ bin/rails server
=> Booting WEBrick...

$ bin/rails generate model
Usage:
  rails generate model NAME [field[:type][:index] field[:type][:index]] [options]

...

Active Record options:
      [--migration]            # Indicates when to generate migration
                               # Default: true

...

Description:
    Create rails files for model generator.

$ bin/rails generate scaffold HighScore game:string score:integer
    invoke  active_record
    create    db/migrate/20130717151933_create_high_scores.rb
    create    app/models/high_score.rb
    invoke  test_unit
    create      test/models/high_score_test.rb
    create      test/fixtures/high_scores.yml
    invoke  resource_route
     route    resources :high_scores
    invoke  scaffold_controller
    create    app/controllers/high_scores_controller.rb
    invoke    erb 
    create      app/views/high_scores
    create      app/views/high_scores/index.html.erb
    create      app/views/high_scores/edit.html.erb
    create      app/views/high_scores/show.html.erb
    create      app/views/high_scores/new.html.erb
    create      app/views/high_scores/_form.html.erb
    invoke  test_unit
    create      test/controllers/high_scores_controller_test.rb
    invoke  helper
    create      app/helpers/high_scores_helper.rb
    invoke    jbuilder
    create      app/views/high_scores/index.json.jbuilder
    create      app/views/high_scores/show.json.jbuilder
    invoke  assets
    invoke    coffee
    create      app/assets/javascripts/high_scores.js.coffee
    invoke    scss
    create      app/assets/stylesheets/high_scores.css.scss
    invoke    scss
   identical    app/assets/stylesheets/scaffolds.css.scss

$ bin/rails db:migrate
==  CreateHighScores: migrating ===============================================
-- create_table(:high_scores)
   -> 0.0017s
==  CreateHighScores: migrated (0.0019s) ======================================

$ bin/rails server

$ bin/rails console staging

$ bin/rails console --sandbox
Loading development environment in sandbox (Rails 4.2.0)
Any modifications you make will be rolled back on exit
irb(main):001:0>

>> app.root_path
=> "/"

>> app.get _
Started GET "/" for 127.0.0.1 at 2014-06-19 10:41:57 -0300
...

>> helper.time_ago_in_words 30.days.ago
=> "about 1 month"

>> helper.my_custom_helper
=> "my custom helper"

$ bin/rails runner "Model.long_running_method"

$ bin/rails runner -e staging "Model.long_running_method"

$ bin/rails generate model Oops
      invoke  active_record
      create    db/migrate/20120528062523_create_oops.rb
      create    app/models/oops.rb
      invoke  test_unit
      create      test/models/oops_test.rb
      create      test/fixtures/oops.yml

$ bin/rails destroy model Oops
      invoke  active_record
      remove    db/migrate/20120528062523_create_oops.rb
      remove    app/models/oops.rb
      invoke  test_unit
      remove      test/models/oops_test.rb
      remove      test/fixtures/oops.yml

$ bin/rails --tasks
rake about              # List versions of all Rails frameworks and the environment
rake assets:clean       # Remove old compiled assets
rake assets:clobber     # Remove compiled assets
rake assets:precompile  # Compile all the assets named in config.assets.precompile
rake db:create          # Create the database from config/database.yml for the current Rails.env
...
rake log:clear          # Truncates all *.log files in log/ to zero bytes (specify which logs with LOGS=test,development)
rake middleware         # Prints out your Rack middleware stack
...
rake tmp:clear          # Clear session, cache, and socket files from tmp/ (narrow w/ tmp:sessions:clear, tmp:cache:clear, tmp:sockets:clear)
rake tmp:create         # Creates tmp directories for sessions, cache, sockets, and pids

$ bin/rails about
About your application's environment
Ruby version              1.9.3 (x86_64-linux)
RubyGems version          1.3.6
Rack version              1.3
Rails version             4.2.0
JavaScript Runtime        Node.js (V8)
Active Record version     4.2.0
Action Pack version       4.2.0
Action View version       4.2.0
Action Mailer version     4.2.0
Active Support version    4.2.0
Middleware                Rack::Sendfile, ActionDispatch::Static, Rack::Lock, #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x007ffd131a7c88>, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::RemoteIp, ActionDispatch::Reloader, ActionDispatch::Callbacks, ActiveRecord::Migration::CheckPending, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, Rack::Head, Rack::ConditionalGet, Rack::ETag
Application root          /home/foobar/commandsapp
Environment               development
Database adapter          sqlite3
Database schema version   20110805173523

$ bin/rails notes
(in /home/foobar/commandsapp)
app/controllers/admin/users_controller.rb:
  * [ 20] [TODO] any other way to do this?
  * [132] [FIXME] high priority for next deploy

app/models/school.rb:
  * [ 13] [OPTIMIZE] refactor this code to make it faster
  * [ 17] [FIXME]

config.annotations.register_extensions("scss", "sass", "less") { |annotation| /\/\/\s*(#{annotation}):?\s*(.*)$/ }

$ bin/rails notes:fixme
(in /home/foobar/commandsapp)
app/controllers/admin/users_controller.rb:
  * [132] high priority for next deploy

app/models/school.rb:
  * [ 17]

$ bin/rails notes:custom ANNOTATION=BUG
(in /home/foobar/commandsapp)
app/models/article.rb:
  * [ 23] Have to fix this one before pushing!

$ export SOURCE_ANNOTATION_DIRECTORIES='spec,vendor'
$ bin/rails notes
(in /home/foobar/commandsapp)
app/models/user.rb:
  * [ 35] [FIXME] User should have a subscription at this point
spec/models/user_spec.rb:
  * [122] [TODO] Verify the user that has a subscription works

desc "I am short, but comprehensive description for my cool task"
task task_name: [:prerequisite_task, :another_task_we_depend_on] do
  # All your magic here
  # Any valid Ruby code is allowed
end 

task :task_name, [:arg_1] => [:pre_1, :pre_2] do |t, args|
  # You can use args from here
end 

namespace :db do 
  desc "This task does nothing"
  task :nothing do
    # Seriously, nothing
  end 
end 

$ bin/rails task_name
$ bin/rails "task_name[value 1]" # entire argument string should be quoted
$ bin/rails db:nothing

$ mkdir gitapp
$ cd gitapp
$ git init 
Initialized empty Git repository in .git/
$ rails new . --git --database=postgresql
      exists
      create  app/controllers
      create  app/helpers
      ...
      ...
      create  tmp/cache
      create  tmp/pids
      create Rakefile
      add 'Rakefile'
      create README.rdoc
      add 'README.rdoc'
      create app/controllers/application_controller.rb
      add 'app/controllers/application_controller.rb'
      create app/helpers/application_helper.rb
      ...
      create  log/test.log
      add 'log/test.log'

$ cat config/database.yml
# PostgreSQL. Versions 8.2 and up are supported.
#
# Install the pg driver:
#   gem install pg
# On OS X with Homebrew:
#   gem install pg -- --with-pg-config=/usr/local/bin/pg_config
# On OS X with MacPorts:
#   gem install pg -- --with-pg-config=/opt/local/lib/postgresql84/bin/pg_config
# On Windows:
#   gem install pg
#       Choose the win32 build.
#       Install PostgreSQL and put its /bin directory on your path.
#
# Configure Using Gemfile
# gem 'pg'
#
development:
  adapter: postgresql
  encoding: unicode
  database: gitapp_development
  pool: 5
  username: gitapp
  password:
...
...