#!/bin/sh

trap 'xset s on +dpms; trap '' 0; exit' 0 1 2 3 13 15

xset s off -dpms
while :; do
    oifs="$IFS"
    IFS="
"
    for f in $(find . -type f ! -path '*/.xvpics/*' ! -path '*/thumb/*' \
	    ! -name '[0-9][0-9][0-9]thumb.???' | sort); do
	[ "$IFS" = "oifs" ] || IFS="oifs"
	showimg -s "$f"
    done
done
.