Linux 定时重启 / Crontab 没有立即生效原因，Crontab重启
> crontab -e
0 3 * * * /sbin/reboot
设置凌晨 3 点重启服务器，但未生效
原因是 crontab 程序需重启
> /etc/init.d/crond restart
以下为测试：
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