Programmed system maintenance

I read that OSX has pre-programmed system maintenance and there is discussion on whether the computer should be turned off at night.
Is there someplace I can check or reset my system maintenance?

To check when your Periodic Maintenance Scripts, which I hope is what you want to know, open Terminal and type this exactly:
ls -al /var/log/*.out
Press Return
and you should see three lines of info, one for each script: Daily, Weekly & Monthly. The date and time they were last run is in each line.
To manually run the scripts open Terminal and type:
sudo periodic daily weekly monthly
Press return. You will be prompted for your Admin password and you need to type this into Terminal. Be warned, it might take a long time to run the scripts.
For more info checkthe most excellent:
The X Lab
Hope this helps
MacBook Pro 15"   Mac OS X (10.4.9)   1.83 GHz Intel Core Duo

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