Update Symbolic Links from older versions of Homebrew Cask to new location so you don't have to re-install all of your apps. Please feel free to make improvements, as this was just kind of thrown together.

update_symbolic_links.sh

#!/bin/sh
#
shopt -s nocaseglob
# parse basic commandline, equals-based arguments
# example: ./update_symbolic_links.sh -e=app -in=.
# example: ./update_symbolic_links.sh -e=app -in=/Users/username/Applications/
for i in "$@"
do
case $i in
    -e=*|--extension=*)
    EXTENSION="${i#*=}"
    shift # past argument=value
    ;;
    -in=*|--inpath=*)
    INPATH="${i#*=}"
    shift # past argument=value
    ;;
    -out=*|--outpath=*)
    OUTPATH="${i#*=}"
    shift # past argument=value
    ;;
    --default)
    DEFAULT=YES
    shift # past argument with no value
    ;;
    *)
            # unknown option
    ;;
esac
done

replacement="/usr/local/Caskroom"
prefix="/opt/homebrew-cask/Caskroom"
for file in "${INPATH}"*."${EXTENSION}"; do
	FILE=${file##*/}
	echo "FILE: ${FILE}"
	FILENAME="${FILE%.*}"
	echo "FILENAME: ${FILENAME}"
	
    original_string=$(readlink "${INPATH}${FILE}")
	echo "original string: ${original_string}"
	result_string=${original_string#$prefix}
	result_string=$replacement$result_string
	echo "result string: ${result_string}"
	ln -sfn $result_string ${INPATH}
	final_string=$(readlink "${INPATH}${FILE}")
	echo "final string: ${final_string}"
done
echo "FILE EXTENSION  = ${EXTENSION}"
echo "IN PATH     = ${INPATH}"
echo "OUT PATH    = ${OUTPATH}"
echo "Number files in IN PATH with EXTENSION:" $(ls -1 "${INPATH}"/*."${EXTENSION}" | wc -l)
if [[ -n $1 ]]; then
    echo "Last line of file specified as non-opt/last argument:"
    tail -1 $1
fi