[2024-feb-29] Sad news: Eric Layton aka Nocturnal Slacker aka vtel57 passed away on Feb 26th, shortly after hospitalization. He was one of our Wiki's most prominent admins. He will be missed.

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talk:howtos:general_admin:task_scheduling [2012/12/25 05:27 (UTC)] – added a note mfillpottalk:howtos:general_admin:task_scheduling [2016/01/05 11:01 (UTC)] (current) – dcron pdi
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 I have added the task of writing pages for cron, at and anacron to my task queue, I will hopefully get them completed soon. --- //[[wiki:user:mfillpot|Matthew Fillpot]] 2012/12/24 21:26// I have added the task of writing pages for cron, at and anacron to my task queue, I will hopefully get them completed soon. --- //[[wiki:user:mfillpot|Matthew Fillpot]] 2012/12/24 21:26//
 +----
 +Slackware uses dcron, which can be used for asynchronous cron.
 +
 +From dcron README, "In the author's opinion, having to combine a cron daemon with another daemon like anacron makes for too much complexity. So the goal is a simple cron daemon that can also take over the central functions of anacron."
 +
 +It uses the notation @freq, eg. @hourly, @daily, etc, or the notation FREQ=, eg FREQ=1h, FREQ=1d, etc. (see man 1 crontab)
 +
 +The daily cron job, as found in Slackware's root crontab is
 +
 +''# Run daily cron jobs at 4:40 every day:''
 +
 +''40 8 * * * /usr/bin/run-parts /etc/cron.daily 1> /dev/null''
 +
 +which, for a host that is not continuously on, can become
 +
 +''# Run daily cron jobs whenever crond is running, and sees''
 +
 +''# that at least one day has elapsed since it last ran''
 +
 +''@daily ID=cron_daily /usr/bin/run-parts /etc/cron.daily 1> /dev/null''
 +
 +Let it be noted that it works equally well at a cold boot or a resume from suspend or hibernate.
 +
 +---pdi 2016/01/05
 +
 +
 +

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