In response to this question:

how do I pass info from a cron job?

As indicated in a previous reply, you can put specific command line args into the crontab entry that runs the perl script (which then looks at @ARGV). Or you can have the crontab entry run some other script that sets some environment variable(s) and then runs the perl script in question (which then looks at %ENV).

But the thing to keep in mind is that each cron table entry is an invariant command line that is run at some regular interval, so whether a particular value (like a disk path) is in the crontab entry or is inside the perl script (or some other intermediate script), it's "hard-coded" in any case.

If you don't want something like a specific path hard-coded in the perl script because it's likely to vary from one run to the next, then you probably don't want that thing hard-coded in the crontab entry either.

Instead, you want some logic (probably within the perl script in question) that will apply whatever rules and/or searches, etc are needed to work out the details for whatever parameter is supposed to vary from one run to the next.