How to start a Ruby Server ( OS X 10.11 El Capitan)
How to start if hombrew, Ruby, Rails, and MySQL are installed:
Run the following commands:
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rails new myapp -d mysql
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cd myapp
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rake:db create
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rails server
Should be running on http://localhost:3000
further documentation: https://gorails.com/setup/osx/10.11-el-capitan