Mac Tip: Schedule maintenance tasks in the Terminal

[h@ker]

By default, Mac OS X performs routine maintenance tasks when your computer is idle. But if your computer is asleep or powered off, maintenance gets skipped. To make sure your Mac's getting cleaned up as often as it should, you can do the job yourself in the Terminal. Apple Support explains how:

1. Open Terminal (/Applications/Utilities).
2. Type: sudo sh /etc/daily
Optionally, for Mac OS X 10.2 or later, you can use: sudo periodic daily
Tip: Typing "daily" runs tasks normally scheduled for a daily interval. Type "monthly" or "weekly" in place of "daily" to runs tasks scheduled for those intervals. Weekly tasks usually require a longer time to run than others.
3. Press Return.
4. Enter your Admin password when prompted, then press Return.
5. Quit Terminal when the task is complete.​

If command line work's not your cup of tea, previously-mentioned Mac Janitor gets the job done too.
Mac OS X: How to force background maintenance tasks [Mac Support]
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