I needed to investigate why a script was being run, and I was pretty sure cron was launching it. The problem was, little useful information was being logged, and no one was sure how it had been set up or what user it was under. Although launchd is now the preferred mechanism on Mac OS for these kinds of things, you’ll still see many systems where cron is being used.
First, you want to become the root user. The following Terminal command is one way to accomplish this: