Upgrade to bash 4 in macOS


I know. Sorry for the long delay in updates. Been extremely busy with my job developing mobile apps and other stuff.

I came here just for write a notes about **install Bash 4** to get some interesting feature from this *Shell*.

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First we are going to get your current *Bash* version installed. If you have 4.X, skip this guide and enjoy your life :)

bash --version
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin15)
Copyright (C) 2007 Free Software Foundation, Inc.

We are going to use the great [Homebrew](http://brew.sh/) package manager:

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install bash
bash --version

Last step is to get it as the default *Shell* in your system:

sudo bash -c 'echo /usr/local/bin/bash >> /etc/shells'
chsh -s /usr/local/bin/bash

Link: [admon.org > New Features in Bash-4.0](http://www.admon.org/scripts/new-features-in-bash-4-0/)