Getting-Started with Bower for Mac OS X
The Mac Tutorial Shows You Step-by-Step How-to Install and Getting-Started with Bower Package Manager for the Web on Mac OS X 10.11 El Capitan.
Bower runs over Git, and is package-agnostic. A packaged component can be made up of any type of asset, and use any type of transport (e.g., AMD, CommonJS, etc.).

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Open a Command Line Terminal Window
(Press “Enter” to Execute Commands) -
Installing Node.js on Mac OS X
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Handling Git Dependency
wich git
If Not Installed then:
How-to Install Git VCS for Mac OS X:
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Installing Bower on Mac OS X
sudo su
If Got “User is Not in Sudoers file” then Look: Solution
npm install -g bower
exit
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Getting-Started with Bower Commands on Mac: