What’s the quickest way to tear down all user apps and services? Or to force a restart? The answer is in the command tool launchctl.
If the kernel is the heart of OS X, launchd is its brain. Use it to run periodic tasks such as synchronising folders automatically.
Macs are increasingly reliant on background services, and increasingly vulnerable to their problems. Mastering the services on your Mac will help make it faster and more stable.