help with unrar script not working

ok i found this script somewhere on the net or even might be from here

what i'm trying to do is after transmission is done i want it to automatically unrar the file the location

if this script won't work can someone please fix so it will work. i know absolutley nothing about coding etc..

Thank you

# posttorrent.sh by Killemov

cd $TR_TORRENT_DIR

if [ -d "$TR_TORRENT_NAME" ]

then

if ls "$TR_TORRENT_NAME"/*.rar > /dev/null 2>&1

then

find "$TR_TORRENT_NAME" -iname "*.rar" | while read file

do

unrar x -inul "$file" /mnt/user/torrents/download

done

echo "Unrarred" $TR_TORRENT_NAME >> /var/log/posttorrent.log

fi

fi