1年前からの日付からRRDを生成。6~19時は0、それ以外は1を書き込む

gen_rrd_nighttime.sh

#!/bin/sh

rrdtool create nighttime.rrd -b $(date -d "1 years ago" +%s) DS:night:GAUGE:600:0:U RRA:MAX:0.5:1:576 RRA:MAX:0.5:6:432 RRA:MAX:0.5:24:540 RRA:MAX:0.5:288:450

perl -MRRDs -e '
        $e=time;
        $s=$e-3600*24*365;
        while($s<=$e) {
                $d=($s + 9 * 3600)%(24 * 3600);
                if($d >= (19 * 3600) || $d <= (6 * 3600)) {
                        RRDs::update("nighttime.rrd","$s:1");
                } else {
                        RRDs::update("nighttime.rrd","$s:0");
                }
                $s+=300;
        }
'