Viewing all the cron jobs running on your system can be very useful. This command (which I found on Stack Overflow, thanks to Jørgen) outputs all the jobs to the screen for you.
tail -n 1000 /var/spool/cron/*
I find this particularly useful when making sure all my Magento sites are running the correct cron jobs at the correct intervals.
If you have more that a 1000 cron jobs you can update the number to display more.
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Clive Walkden
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