Upgrade Brew and all installed packages including casks, then clean up

brew-upgrade.sh

brew-upgrade() {
  (set -x; brew update;)

  red=`tput setaf 1`
  green=`tput setaf 2`
  reset=`tput sgr0`

  casks=( $(brew cask outdated) )

  for cask in ${casks[@]}
  do
    version=$(brew cask info $cask | sed -n "s/$cask:\ \(.*\)/\1/p")

     echo "${red}${cask}${reset} requires ${red}update${reset}."
     (set -x; brew cask uninstall $cask --force;)
     (set -x; brew cask install $cask --force;)
  done

  brew upgrade

  (set -x; brew cleanup;)
  (set -x; brew cask cleanup;)
}