===== Ubuntu - Cron - Schedule a Cron Job to Run on the First Sunday of Each Month =====

It's not possible to schedule a job that will run on the first Sunday of every month using the crontab time-period values.

However, we can leverage the conditional section of the command portion to achieve this.

Notice how the below command is implemented carefully.

<file>
0 2 * * sun [ $(date +%d) -le 07 ] && /script/script.sh
</file>

This entry will only invoke the script.sh file on the first Sunday of every month.

It is analogous to the command shown below.

<file>
0 2 * * 7 [ $(date +%d) -le 07 ] && /script/script.sh
</file>