#!/bin/sh
[ $# -eq 1 ] && echo "usage: $0 command ..." && exit 64
tmp1=$(mktemp $0.XXXXXXXXXX)
tmp2=$(mktemp $0.XXXXXXXXXX)
trap "rm $tmp1 $tmp2; exit 0" 1 2 15
while "$@" >$tmp2
do
	if ! diff $tmp1 $tmp2
	then
		cp $tmp2 $tmp1
	else
		echo -n "."
	fi
	sleep 2
done
rm $tmp1 $tmp2