The answer is
The crontab website gives the real time results display: https://crontab.guru/#5_8_*_*_0
Cron job expression in a human-readable way crontab builder
* * * * 0
you can use above cron job to run on every week on sunday, but in addition on what time you want to run this job for that you can follow below concept :
* * * * * Command_to_execute
- ? ? ? -
| | | | |
| | | | +?? Day of week (0?6) (Sunday=0) or Sun, Mon, Tue,...
| | | +???- Month (1?12) or Jan, Feb,...
| | +????-? Day of month (1?31)
| +??????? Hour (0?23)
+????????- Minute (0?59)
To have a cron executed on Sunday you can use either of these:
5 8 * * 0
5 8 * * 7
5 8 * * Sun
Where 5 8 stands for the time of the day when this will happen: 8:05.
In general, if you want to execute something on Sunday, just make sure the 5th column contains either of 0, 7 or Sun. You had 6, so it was running on Saturday.
The format for cronjobs is:
+---------------- minute (0 - 59)
| +------------- hour (0 - 23)
| | +---------- day of month (1 - 31)
| | | +------- month (1 - 12)
| | | | +---- day of week (0 - 6) (Sunday=0 or 7)
| | | | |
* * * * * command to be executed
You can always use crontab.guru as a editor to check your cron expressions.
@weekly work better for me!
example,add the fellowing crontab -e ,it will work in every sunday 0:00 AM
@weekly /root/fd/databasebackup/week.sh >> ~/test.txt
I think you would like this interactive website, which often helps me build complex Crontab directives: https://crontab.guru/
Following is the format of the crontab file.
{minute} {hour} {day-of-month} {month} {day-of-week} {user} {path-to-shell-script}
So, to run each sunday at midnight (Sunday is 0 usually, 7 in some rare cases) :
0 0 * * 0 root /path_to_command
When specifying your cron values you'll need to make sure that your values fall within the ranges. For instance, some cron's use a 0-7 range for the day of week where both 0 and 7 represent Sunday. We do not(check below).
Seconds: 0-59
Minutes: 0-59
Hours: 0-23
Day of Month: 1-31
Months: 0-11
Day of Week: 0-6
reference: https://github.com/ncb000gt/node-cron
10 * * * Sun
Position 1 for minutes, allowed values are 1-60
position 2 for hours, allowed values are 1-24
position 3 for day of month ,allowed values are 1-31
position 4 for month ,allowed values are 1-12
position 5 for day of week ,allowed values are 1-7 or and the day starts at Monday.
Source: Stackoverflow.com