OSX Install Homebrew & Rbenv & Cocoapods

Step 1.
Install Homebrew

$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Step 2.

Install Rbenv

$ brew install rbenv

$ brew install ruby-build

Set shell Environment

$ sudo echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> /Users/Username/.bash_profile

$ echo 'eval "$(rbenv init -)"' >> /Users/Username/.bash_profile

Reload

$ source /Users/Username/.bash_profile 

Rbenv install plugin

$ mkdir -p ~/.rbenv/plugins 

$ git clone git://github.com/tpope/rbenv-aliases.git ~/.rbenv/plugins/rbenv-aliases

$ rbenv alisa 

Install Ruby

List Ruby version 

$ rbenv install --list

$ rbenv install 2.1.3

List Installed Ruby Version

$ rbenv versions

$ rbenv global 2.1.3

Step 3.

Install Cocoapods

$ sudo gem install cocoapods