I don't think this has been necessary since around OS X 10.3 - these periodic 
tasks now get automatically deferred until the next time the Mac is woken up.

Paul

On 9 Nov 2010, at 22:31, Stuart Dunkeld wrote:

> I suggest doing this every few months:
> 
> Open the Terminal app, and type
> 
> sudo periodic daily weekly monthly
> 
> After you type in your password (which the sudo command requires to act as 
> the root user on your behalf) nothing will happen visibly, but inside OSX 
> various housekeeping tasks are taking place. Once the operation is complete 
> (and it can take a few minutes) you can close Terminal
> 
> These tasks are scheduled by the system to take place at odd times of the 
> night, as UNIX systems generally used to be on all the time, so as it's not 
> so common now for a system to be up at 3.15 AM you have to run them manually.
> 
> As far as I know there are no risks involved in running these commands.
> 
> Regards
> 
> Stuart
> 

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