Using Linux Crontab example

If you want to execute some task in every 5 minutes?
如果想在 Linux 中定時執行某些任務？

crontab -l    // see the list of crontab
crontab -e    // edit current crontab

Example situations: Sync up system time every 5 minutes.
Create a file /root/synctime.sh and set 775, the synctime.sh execute your update logic then which execute every 5 mins

*/5 * * * * /root/synctime.sh

Here is a online crontab exerciser (這裡有個線上 crontab 的練習器)
https://crontab.guru/every-weekday