update homebrew (el capitan permissions)

updateBrew.sh

#! /usr/local/bin/bash
echo "1. chown SIP affected directories." 
echo "see https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/El_Capitan_and_Homebrew.md"
sudo chown $(whoami):admin /usr/local && sudo chown -R $(whoami):admin /usr/local
echo "\n2. update homebrew."
brew update
echo "\n3. upgrade packages."
brew upgrade
echo "\n4. cleanup."
brew cleanup
echo "\n5. homebrew doctor."
brew doctor
echo "\n-------\n Done! \n-------"