Simple script to export iTunes library to mp3. (use it for my car radio usb stick) You need faad and lame Tested on mac brew install faad2 lame

export_itunes_library.sh

#!/bin/bash

itunes_folder="/Users/MacBookPro/Music/iTunes/iTunes Media/Music"
output_folder="/Users/MacBookPro/MP3s"
if [ ! -d "$output_folder" ]; then
    mkdir -p "$output_folder"
fi
find "$itunes_folder" -type f | while read FILENAME;
do
   file=$(basename "$FILENAME")
   extension="${file##*.}"
   file_no_ext="${file%.*}"

   rel_path=${FILENAME/$itunes_folder/}
   rel_path=${rel_path%$file}
   
   if [ "$extension" = "m4a" ];
   then 
      target_folder="$output_folder$rel_path"
      #create directory if not exists
      if [ ! -d "$target_folder" ]; then
         mkdir -p "$target_folder"
      fi
      faad -o - "$FILENAME" | lame -V2 - "$output_folder$rel_path$file_no_ext".mp3
   elif [ "$extension" = "mp3" ];
   then
      #create directory if not exists
      if [ ! -d "$target_folder" ]; then
         mkdir -p "$target_folder"
      fi
      cp "$FILENAME" "$output_folder$rel_path$file"
   fi
done