#!/bin/sh
h=$(date +%H)
if [ ${h#0} -lt 10 -o ${h#0} -ge 21 ]; then
	(pgrep -f /usr/bin/redshift >/dev/null 2>&1 || DISPLAY=:0 exec /usr/bin/redshift -l 42:-71) &
else
	killall -q redshift
fi
: