How to Schedule a Cron Job to Run at the Last Day of Every Month

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The cron software is a useful device for automating duties to run for a particular date and time. For example, you’ll automate a task to run each closing day of the month at a given time. Automating duties is one thing you’ll’t forego, particularly as an administrator. It is also a backup that you want to create for run quite a lot of scripts. To steer clear of forgetting to run scripts, the most suitable option is to change the crontab record and time table cron jobs, which can run with out your intervention.

This information gifts how you’ll create a cron activity, specifically one who executes at the closing day of every month.

Working With Cron Jobs

You will have to create a crontab record for the given consumer to create a cron activity in Linux, UNIX, or macOS. The crontab record incorporates tables with 5 fields the place you’ll specify the date and time of the cron activity and the overall trail to the script or command to run.

The syntax of a crontab record is as proven:

Minute Hour Date_of_Month Month Day_of_Week  command/script

Use the command beneath to open the crontab record:

Here, we’ve opened a crontab record for the present consumer. If you want to time table the activity for a selected consumer, use the syntax beneath.

$ crontab -e -u

With your crontab record opened, you’ll upload your cron activity on the backside.

For example, if we want to create a cron activity that executes each first day of every month, the cron activity could be as proven:

$ 10 10 1 * * /trail/to/script.sh

The above creates a cron activity that executes each 10:10 AM every month at the first day.

Schedule Cron Job on Last Day of Every Month

Determining the closing day of the month may also be difficult as some months have 28, 29, 30, or 31 because the closing date. Besides, the sector for the Day_of_Month takes a particular day and giving it an inventory of imaginable days would execute on an wrong day.

The trick is to specify a command that exams if the following day is the primary day of the month. If so, it manner the present day is the closing of that month and the cron activity can then execute.

The command beneath exams and returns day after today’s date:

Using the similar thought, we will be able to create a situation that if day after today’s date returns as 01—which means it’s the first day—then the cron activity to execute.

For example, we will be able to specify the command to echo a given output and check that it’s going to run when added to the crontab record. Let’s alter the command above as proven beneath:

$ [ “$(date +%d -d tomorrow)” = “01” ] && echo “Tommorow is 1st”

Now, as a substitute of the command showing output to verify that day after today is the primary day of the month, we will be able to set it to run our cron activity.

The new command could be:

$ 30 13 28-31 * * [ “$(date +%d -d tomorrow)” = “01” ]  && /house/kyle/linuxhint.sh

The cron activity above would run each 1:30 PM of each closing day of the month. Whether the closing day is 28,29, 30, or 31, it’s going to execute the desired script.

Note that we’re checklist the imaginable dates of each closing day of the month and continuing to present the command which exams that if the following day is the primary day of the following month, then the present day is the closing of the month. Once showed, it then executes the script.

Conclusion

This information introduced a hands-on information on methods to time table one if you happen to had been caught on scheduling a cron activity that runs each closing day of every month. We’ve noticed methods to decide the closing day of any month and time table a cron activity.

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