Let It Snow In Your Terminal

letitsnow.sh

#!/bin/bash

# Single cases are from
# http://climagic.org/coolstuff/let-it-snow.html
#
# Multi-mode script
# made by qub1750ul

fallSpeed=0.1

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

case "$1" in
	""|0)

		# Unicode snowflake version
		clear ;
		while :;
		do
			echo $LINES $COLUMNS $(($RANDOM%$COLUMNS)) $(printf "\u2744\n") ;
			sleep $fallSpeed ;
		done | \
		gawk '{a[$3]=0;for(x in a) {o=a[x];a[x]=a[x]+1;printf "\033[%s;%sH ",o,x;printf "\033[%s;%sH%s \033[0;0H",a[x],x,$4;}}'

		;;

	1)

		# Short version
		for((I=0;J=--I;)) do
			clear ;
			for((D=$LINES;S=++J**3%$COLUMNS,--D;)) do
				printf %*s.\\n $S ;
				done;
			sleep $fallSpeed ;
			done

		;;

esac