#!/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\u274$[($RANDOM%6)+3]\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