linux - crontab每3天执行一次任务的每3天的含义是啥？

Question

是当时生效后每隔三天吗？还是每月1号起，每隔三天？

Answer 1

Neither of the first two answers is accurate:

The value range and meaning of the five columns of numbers representing time in

crontab are as follows:

分钟　（0-59）
小时　（0-23）
日期　（1-31）
月份　（1-12）
星期　（0-6）    // 0 代表星期天

If you write:

0 0 */3 0 0 xxx.sh

This is not strictly three days. This will be executed on the 1,4,7,10,13,16,19,22,25,28,31 day of each month. For details, please see: https://segmentfault.com/q/1010000002402396/a-1020000002402524

Answer 2

The first execution will start from 0:00 the next day and 72 hours later

Answer 3

You understand it as every 72 hours

Answer 4

The correct answer upstairs, 分时日月周, depends on how you write it