Cut the last 10 seconds of several video files "Bash Script"

script.sh

for file in `find . -name '*.mp4'`
do 
    echo "This is the file: " $file
    DURATION=`ffprobe -i $file -show_format -v quiet | sed -n 's/duration=//p'`
    echo "Duration: " $DURATION
    FINAL=`echo "$DURATION - 10" | bc`
    echo "Final Duration: " $FINAL
    ffmpeg -i $file -t $FINAL -c copy $file.mp4
done