Use bash from MacPorts in OSX

use_bash_from_macports_in_osx.sh

# Install latest bash version using macports
sudo port install bash

# Add macports bash as an available shell interpreter 
echo /opt/local/bin/bash >> /etc/shells

# Set macports bash as the default shell interpreter
chsh -s /opt/local/bin/bash

# Open a new terminal window
open -a Terminal -n

# Confirm by checking the bash version in the new terminal window
echo $BASH_VERSION