在 macOS 中使用 cron 定时任务和 Linux 下略有区别。

首先在终端输入，查看服务是否运行：

sudo launchctl list | grep cron

输出结果：

-	0	com.vix.cron

接下来查看启动项的配置：

locate com.vix.cron

如果提示 database 不存在

WARNING: The locate database /var/db/locate.database does not exist.
To create the database, run the following command:

  sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist

Please be aware that the database can take some time to generate; once
the database has been created, this message will no longer appear.

按照上面的英文提示，创建一个 database，等几分钟后才会生成相关文件：

$ sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist
$ locate com.vix.cron
/System/Library/LaunchDaemons/com.vix.cron.plist

随后可以使用 crontab -e 创建任务，具体方法参考：https://javascript.net.cn/articles/690

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