Script to update installed Homebrew casks that are not tracked by brew udpate

brew-cask-upgrade

#!/bin/sh

# brew upgrade often fails to update brew casks
# this script upgrades any brew casks where the cached version is older than the current version or cache has been deleted
# some casks, like Skype, have no versioning at all. This script always forces unversioned "latest" casks to re-install 
# from the latest download.

red='\033[0;31m'
green='\033[0;32m'
yellow='\033[0;33m'
blue='\033[0;34m'
magenta='\033[0;35m'
cyan='\033[0;36m'
NC='\033[0m' # No Color

SELF=`echo $0 | sed -ne 's|^.*/||p'`
if [ "$(id -u)" -ne 0 ]; then
	echo "$SELF must be run as root." 1>&2
	echo "try: sudo $SELF [force]" 1>&2
	exit 1
fi

# only test versions of gpgtools if gpgtools is installed
if [ ! -z $(brew cask list | grep gpgtools) ]; then
	CURRENT_GPGTOOLS=$(brew cask info gpgtools | egrep ^gpgtools | cut -d ' ' -f 2)
	NEW_GPGTOOLS=$(brew cask list --versions | grep gpgtools | cut -d ' ' -f 2)
fi

echo "${green}==>${NC} Upgrading versioned casks"
for cask in $(brew cask list --versions | egrep -v latest$ | cut -d ' ' -f 1 ); do
	brew cash uninstall ${cask} 2> /dev/null # uninstall or brew cask leaves the old version in place in Caskroom/{appname}/{version}
	brew cask install ${cask} 2> /dev/null
done
echo "${green}==>${NC} done updating versioned casks"
if [ "$1" = "force" ]; then
	echo "${green}==>${NC} forcing updates to unversioned caksks"
	# not necessary to uninsatll old version because it uses the same "Caskroom/{appname}/latest" directory
	brew cask list --versions | egrep latest$ | cut -d ' ' -f 1 | xargs brew cask install --force
	echo "${green}==>${NC} done forcing updates to unversioned casks"
else
	echo "${blue}==>${NC} Skipping unversioned casks"
	echo "${blue}==>${NC} to force udpate all:"
	echo "    ${yellow}${SELF} force${NC}"
	echo "${blue}==>${NC} commands to update individually"
	for cask in $(brew cask list --versions | egrep latest$ | cut -d ' ' -f 1); do 
		echo "    ${yellow}brew cask install --force ${cask}${NC}"
	done
	echo "${green}==>${NC} done"
fi

if [ "$CURRENT_GPGTOOLS" != "$NEW_GPGTOOLS" ]; then
	# the cask formula for gpgtools incorrectly invokes `fixGpgHome` with the user context of the executing process
	# which sets your ~/.gnupg directory to be owned by root if you run `sudo brew cask install gpgtools`
	# This invokes `fixGpgHome` with your actual login name rather than root to fix those permissions.
	if [ -f /usr/local/MacGPG2/libexec/fixGpgHome ]; then
		/usr/local/MacGPG2/libexec/fixGpgHome $(logname)
	fi
fi

I'm not really convinced that brew cask solves more problems than it creates at this point.