adding

petrified.crontab

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+## Various examples of how to run petrified via cron -- note that not all
+## cron implementations support /etc/cron.d/ (i.e. fcron does not)
+
+## run system level every 15 minutes
+## /etc/cron.d/petrified
+*/15 * * * * root /usr/bin/petrified
+
+## run system level every hour
+## /etc/cron.hourly/petrified
+#!/bin/bash
+/usr/bin/petrified
+
+## run user level every 30 minutes
+## (f)crontab -e (-u <username>)
+*/30 * * * * /usr/bin/petrified