'Cron Expression to trigger every previous Month File

I am trying to schedule a cronjob to get triggered on the 4th of every month at 9 AM, which is fine. But I want to schedule a cronjob to run on every previous month of the current date.

Ex:

Schedule - 202105(YYYYMM) - 0 9 4 * *

Expected - 202104(YYYYMM) -?

If I'm executing on May 4th 2021 9 AM, it has to trigger for April 4th 2021, that means it has to run for previous month files. Is it possible to schedule a cronjob in a way to pick previous month files on current month execution?

cron


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