>> Sure, cron writes to /var/cron/log every 10 minutes by default (and
>> cron has no options at all, so this can't even be disabled). 
>
>It does this because is starts atrun every 10mn. If you kill /usr/libexec/atrun
>from your crontab, the log file should be updated less often.

(admittedly not having looked at the code at all)

how easy would it be to integrate atrun into cron?  or is it not part
of cron for a reason?

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