• Text editor: Atom etc
• Terminal: iTerm etc
• Browser: Chrome etc
• Git

• Either Ruby Version Manager (RVM) or rbenv
• Allow you to install and manage multiple versions of Ruby on the same machine.
• NOTE: RVM and rbenv can’t be used on the same system simultaneously
  • check $ which rvm and $ which rbenv

# Install RVM
$ \curl -sSL https://get.rvm.io | bash

# Reload this shell and initialize rvm.
$ exec bash -l

# Update rvm
$ rvm get master

# Install ruby
$ rvm install 2.3.1
# NOTE: If you get the warning below, you can safely ignore it and move on to step 3.
# * WARNING: You have '~/.profile' file, you might want to load it,
#   to do that add the following line to '/Users/adamzerner/.bash_profile':

# Configure your default version of ruby
$ rvm use 2.3.1 --default

$ rvm help
$ rvm gemset help

• http://rails-4-0.railstutorial.org/book/beginning#sec-install_ruby
• https://github.com/ga-dc/installfest/blob/master/Rakefile
• Ruby Version Manager (RVM) Overview for Rails Newbs

• RubyGems is a package manager for Ruby projects.
• Provides the gem command.
• NOTE: If you have installed RVM, you already have RubyGems, since RVM includes it automatically.
  • Check $ which gem

# Install Rails with a specific version number.
$ gem install rails -v 4.2.2

• Ensure that Ruby and Rails are installed.
• Ensure that Git initial configuration is completed.

$ cd ~/workspace
$ rails _4.2.0_ new myapp -d postgresql
$ cd sample_app/

• Edit Gemfile.
• Run $ bundle install --without production for the first time.
• Run $ bundle update to update gems.

• By default, the same as your OS X user account.

$ rake db:create

$ rails server # Vist http://localhost:3000/

$ gem list rails