The instructions for older OS don't seem to work well with system integrity protection enabled on OS X El capitan 10.11.1
What options for a http://railsinstaller.org or another one package, streamlined install to get rails running?
first of all you need ruby... as you are on OS x EL capitan you already have ruby... so first step done... ruby is the programming language... rails is the framework ... so you already have the language now you want the framework...
next is you need to install bundler (package manager for ruby):
gem install bundler
then you can install rails:
gem install rails
so now you can create a new project with:
rails new my_app_name
when you did this you will recognize that after the creation of a bunch of things it executes bundle install... so afterwards you should be able to start your app with:
rails s
If an error occurs during the installation just lookup the error by a quick google search... most of the time it is just a dependency that you are missing... also depending on which tutorial you tried you may need to start mysql first... or execute something like: rake db:create (create a database in your chosen database) and afterwards: rake db:migrate to create some tables (but this depends on the previous tutorial) try to get the welcome page from rails first ... you should get it in your browser with the adress: localhost:3000