Nieve script

#!/bin/bash

LINES=$(tput lines)
COLUMNS=$(tput cols)

declare -A snowflakes
declare -A lastflakes

clear

function move_flake() {
i="$1"

if [ "${snowflakes[$i]}" = "" ] || [ "${snowflakes[$i]}" = "$LINES" ]; then
snowflakes[$i]=0
else
if [ "${lastflakes[$i]}" != "" ]; then
printf "\033[%s;%sH \033[1;1H " ${lastflakes[$i]} $i
fi
fi

printf "\033[%s;%sH❄\033[1;1H" ${snowflakes[$i]} $i

lastflakes[$i]=${snowflakes[$i]}
snowflakes[$i]=$((${snowflakes[$i]}+1))
}

while :
do
i=$(($RANDOM % $COLUMNS))

move_flake $i

for x in "${!lastflakes[@]}"
do
move_flake "$x"
done

sleep 0.1
done