ファイル名の末尾に .yyyymmdd または .yyyymmdd_hhmmss を付与します
fymd ()
{
stat -L -c '%N %N.%y' "$@" | perl -pe 's/(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})\.\d+ [-+]?\d{4}$/$1$2$3/'
}
fymdt ()
{
stat -L -c '%N %N.%y' "$@" | perl -pe 's/(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})\.\d+ [-+]?\d{4}$/$1$2$3_$4$5$6/'
}