尽管对于经常关闭的系统来说，Cron会造成一些严重的问题，但是，对于经常运行的作业，比如远程邮件服务器上每小时进行一次的新邮件检查，Cron仍然是一个重要的工具。
Although Cron has serious problems on a system that is shut down regularly, it is still the tool of choice for jobs that run frequently, such as hourly checks for new E-mail on a remote mail server.
当anacron运行时，它检查自作业上一次运行以来是否已经经过了所需的天数，如果需要，就运行作业。
When anacron runs, it checks to see if the required number of days has passed since the job was last run and runs it if necessary.
考虑添加cron作业来提醒自己每月至少检查一次备份。
Consider adding a cron job to remind yourself to check your backups at least once per month.
每次运行时，Anacron将检查作业列表以了解自最后一次运行某个作业后，是否超过了该作业的指定时间间隔。
Each time it runs, Anacron checks its job list to see if it's been longer than the specified interval since a job was last run.
每次运行时，Anacron将检查作业列表以了解自最后一次运行某个作业后，是否超过了该作业的指定时间间隔。
Each time it runs, Anacron checks its job list to see if it's been longer than the specified interval since a job was last run.
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