Scheduling services with cron and similar tools is great for repetitive tasks but inconvenient for one-time tasks that only need to be accomplished once. For tasks that only need to be accomplished once, use the at command.
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Schedule periodic tasks with cron
http://blogs.techrepublic.com.com –
Periodic schedulers come in many shapes and sizes but one constant is cron, the scheduling daemon that will run programs and scripts at arbitrary times or intervals. A number of different cron implementations exist: although vixie-cron may be the most popular, there are other similar programs such as dcron, fcron, anacron, and others.
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