ZSH script used to convert FLAC files to ALAC using ffmpeg, preserving respective metadata.

flac2alac.zsh

#!/usr/bin/env zsh

if [[ "$1" == "" ]]; then
	echo "No directory specified! Using \`pwd\`."
	location=`pwd`
else
	location="$1"
fi

if [[ "$2" != "" ]] ; then
	map="$2"
else
	map="0"
fi

for file in $location/**/*.flac; do
	ffmpeg -i "$file" -map $map:0 -acodec alac "${file%.flac}.m4a"

	if [[ "$?" == 0 ]]; then
		rm "$file"
	fi
done