Install Ruby and Bundler at the user level

Deprecated in favor of: gist.

Steps:

1. Install Ruby at the user level.
   • Install with your package manager.
     • On Debian/Ubuntu using apt-get (ruby-full includes ruby and ruby-dev):

       $ sudo apt-get install ruby-full

     • On macOS using Homebrew:

       $ brew install ruby

     • Other - follow the official Ruby Installation guide.
   • More details are available in my Ruby install guide including how to set PATH on Linux and macOS. That guide has been updated to cover macOS Catalina setup too.
2. Install Bundler at the user level. The flag at the end is necessary to install in ~/.gem for your user. And also avoids having to use sudo to overcome a permissions error.

   $ gem install bundler --user-install

3. Confirm installation. Note bundler and bundle are equaivelent.

   $ bundle --version