In a previous post we’ve seen how to Enable automatic security update in Debian/Ubuntu, I use it on my Debian VPS and I must say that I’ve forgot to be worried about security updates thanks to this, but perhaps you have a Red Hat 6 or Centos 6 and you want to sleep well as well ?
There is no problem, today we’ll see how to achieve the same result on a Centos 6 machine.
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In a former article I’ve talked about the commands cron and crontab that are the standard way to schedule recurring things on a Gnu/Linux system.
But sometimes you need to do one thing at a specific date and time for just one time, and for these tasks the best option is to use at, another way to use at is to run a command later when the computer won’t be busy.
Or another reason could be that you want to run a command that requires a lot of time to end and you have to disconnect from that server, at could be used in this situation, but for these task i suggest to take a look at the articles on how to run commands on background and the utility screen