OS X uses this mode automatically with supported UPSs in emergency shutdowns. This simulates a dirty shutdown to permit a later automatic power on. The system is halted up until the point of removing system power, but waits before removing power for 5 minutes so that an external UPS (uninterruptible power supply) can forcibly remove power. The system is put to sleep at the specified time. The system is rebooted at the specified time. If -h or -r is specified, shutdown will execute halt(8) or reboot(8) instead of sending a signal to launch(8). ![]() If the -o is specified, prevent the file system cache from being flushed by passing -n option to halt(8) or reboot(8). The -k option does not actually halt the system, but leaves the system multi-user with logins disabled (for all but super-users). The system is halted at the specified time. Below, we’ve included the complete list of shut down switches and descriptions from Apple. ![]() The two methods we covered above are only two of the many ways you can shut down your Mac in Terminal. (I did take the opportunity to clean the keyboard and screen as this is the first time the MacBook appears to have been completely off! I once almost locked myself out by cleaning the keyboard and getting a message warning about incorrect password entry).Other Command Prompt Shutdown Switches and Parameters After reading various forums I found I had to turn on the MacBook using the power button, something I have never needed to do as usually just opening the lid turns it on. It didn’t so I assumed it needed more power to operate and waited a bit. After plugging in the adapter and hearing the confirmation sound I was expecting the MacBook to come to life. I think I may have done this when the battery was very low and wonder if this could have caused the problem? The next time I opened the lid the battery low ikon appeared in the centre of the screen. I usually shut the lid until I need it again. I am wondering if it is triggered by a combination of battery drain and sleep mode? I only occasionally restart the MacBook. I have had my MacBook for about two years, (the first I have owned), and I have not seen this error message before. It was very irritating getting the error message on every start up. Thank you so much! Your solution and instructions are perfect and the problem is fixed for me. Re How to Fix ‘You Shut Down Your Computer Because of a Problem’
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