day-to-year.sh

seq 2000 2019 | while read y ; do
    [ "$y" = "" ] && break
    rm -rf n$y
    mkdir -p n$y
    find . -type f |grep --color=no ./$y | while read i; do
        a=$(dirname "$i")
        a=$(basename "$a")-$(basename "$i")
        cp -f "$i" "n$y/$a"
    done
done