Dumb Q - What is a cron job?

[Cleo]

I just think of cron as a really convoluted time clock with very hard to use tabs.

I always love it when I setup a crontab to do something once a day but due to the wonderful user friendliness of Vi and the cron interface end up having it do it once each second.

CronniX is a wonderful easy to use Mac application that I use for setting up crontabs.