I assume you told the crontab system when you want it run? For instance, every day at midnight? From the man pages for crontab, an example crontab entry with an optional output file:
5 0 * * * $HOME/bin/daily.job >> $HOME/tmp/out 2>&1
In that example, the crontab will run at 12:05 AM, daily, send the output to /tmp/out in your home directory, and not send you an email.
Yes, I have an opinion.
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