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Old 03-29-2005, 09:42 PM   #1
Registered: Mar 2005
Distribution: Ubuntu 12.04 LTS
Posts: 249

Rep: Reputation: 16
"cron" can do things while your computer is off?!?


I read in a tutorial that some implementations of crond can be scheduled to do things while your computer is off, which would be useful for things like a home PC.

1) How in the world can "cron" do stuff when your computer is off? That's wild! Please explain...

2) What's the difference between "cron" and "crond"? And which should I talk about when asking questions like above?

Old 03-29-2005, 10:13 PM   #2
Registered: Jan 2005
Posts: 37

Rep: Reputation: 15
What tutorial was that? I'm pretty sure a program can't run while the computer is off...

Okay, all sarcasm aside now. Correct me if I'm wrong, but I read from somewhere that fcron - which is different from cron - can make up a job if it was supposed to run while the computer was off, which may be the case in home PC's.
Old 03-29-2005, 10:46 PM   #3
Registered: Mar 2005
Distribution: Ubuntu 12.04 LTS
Posts: 249

Original Poster
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Haha, I hope people actually believe that it was in a tutorial and that I didn't make it up!

Well it was in a tutorial...Rute, believe it or not! Here it is:

It's the very last two lines, Section 37.3 (Other cron Packages)

What are your thoughts on this! Pretty wild, huh?
Old 03-29-2005, 11:30 PM   #4
LQ Veteran
Registered: Mar 2003
Location: Boise, ID
Distribution: Mint
Posts: 6,642

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Computers cannot operate if they are unplugged. If you have a task that is scheduled for say 2:00 PM on Friday, but you power down that machine at 1:30 PM Friday and leave it off for a few hours, that task will not run at 2:00 PM Friday.

What Sheer should have said is that there are programs that can detect and compensate for "missed" scheduled jobs that were supposed to run at given time but weren't. -- J.W.
Old 03-29-2005, 11:53 PM   #5
Registered: Mar 2004
Location: Tampere, Finland
Distribution: Debian, Familiar, OS X
Posts: 145

Rep: Reputation: 16
indeed you can approach this stuff like toasters: they donīt toast if they are off.
well, this gave me a wonderful idea for april offence


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