the difference between crontab -e and crontab -r is that while crontab -e allow you to edit the cronjob, crontab -r remove the cron file forever..and left you scratching ur head....and more funny thing is if u look at the keyboard the 'e' and 'r' are adjacent..so be very careful, also you can take the back up of all(for each user there is different cron file) the cron from/var/spool/cron.
i will came with lot more if time permits....till then enjoy...:)
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