brew_cask_upgrade

#!/bin/sh
brew update;
for app in $(brew cask list);
do cver="$(brew cask info "${app}" | head -n 1 | cut -d " " -f 2)";
  ivers=$(ls -1 "/usr/local/Caskroom/${app}/.metadata/" | tr '\n' ' ' | sed -e 's/ $//');
  aivers=(${ivers});
  nvers=$(echo ${#aivers[@]});
  echo "[] Found ${app} in cask list. Latest available version is ${cver}. You have installed version(s): ${ivers}";
  if [[ ${nvers} -eq 1 ]];
    then echo "${ivers}" | grep -q "^${cver}$" && { echo "[] Latest version already installed :) Skipping changes ..."; continue; };
  fi;
  echo "[+] Fixing from ${ivers} to ${cver} ...";
  brew cask uninstall "${app}" --force;
  brew cask install "${app}";
done