Delete duplicates from mpd playlist

mpd_delete_duplicates.sh

mpd_first_duplicate(){
  mpc -f "%position% \t %file%" playlist | awk ' {
  pos=$1
  $1=""
  map[$0]=map[$0]+1 ;
  if (map[$0] > 1) {
    print pos ;
    exit
  }
}'
}

mpd_delete_duplicates(){
  while true; do
    item="$(mpd_first_duplicate)"
    if [ -z "$item" ]; then
      break
    fi
    mpc del "$item"
  done
}