bash script to get get random wallpapers on two screens every 45m

wallpapers.sh

#!/bin/sh

WALLPATH_BIG=/home/tmplt/.wallpapers/big/
WALLPATH_SMALL=/home/tmplt/.wallpapers/small/

while true; do
	# Choose a random wallpaper for the big screen
	WP_BIG=$(find $WALLPATH_BIG -type f \( -name '*.jpg' -o -name '*.png' \) -print0 |
		shuf -n1 -z)
	
	# .. and the small screen,
	WP_SMALL=$(find $WALLPATH_SMALL -type f \( -name '*.jpg' -o -name '*.png' \) -print0 |
		shuf -n1 -z)
	
	                         # My small screen is the first one from left to right.
	feh --no-fehbg --bg-fill "${WP_SMALL}" --bg-fill "${WP_BIG}" > /dev/null 2>&1
                                                                       # Throw away all output.	
	sleep 45m
done