#!/bin/sh

uptime="$(uptime)"
uptime="${uptime#*up }"

d=0
case "$uptime" in
	*day*)
		d="${uptime%% *}"
		uptime="${uptime#*, }"
		;;
esac

h="${uptime%%:*}"
h="${h#0}"
uptime="${uptime#*:}"
m="${uptime%%,*}"
m="${m#0}"

printf '{"d":%d,"h":%d,"m":%d}\n' "$d" "$h" "$m"