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How do you use bless commands on a Mac?
To get an overview of the blessed volumes on your machine, run bless –info : If you’re on a Mac booted from an APFS disk, you’ll need to prepend sudo to run the bless command. $ sudo bless –info … => Blessed System File is {Preboot}/ … /System/Library/CoreServices/boot.
How do I bless my Mac hard drive?
The command for setting the startup disk using Terminal is “bless“. To get the full story on “bless” open up Terminal and type “man bless” (no quotes). You can incorporate this into a UNIX shell script to reboot your machine to another disk at a certain time.
Where is boot EFI on Mac?
efi on the Preboot volume /dev/disk1s2. This is found in a folder named by UUID, which in turn matches the root volume, in the path /System/Library/CoreServices again. Only available on Macs equipped with a T2 chip, this is controlled in Startup Security Utility, which is available in Recovery mode.
What is EFI on a Mac?
EFI, which stands for Extensible Firmware Interface, bridges a Mac’s hardware, firmware, and operating system together to enable it to go from power-on to booting macOS. macOS High Sierra will be publicly released on the Mac App Store later today. Tags: security, EFI.
Is there a bless SETBOOT command for Mac?
I run a couple of computer labs at a university that dual boot into Mac OSX 10.11.6 and Windows 8.1 Pro. Years ago, I used to be able to run a bless -setboot command from Apple Remote Desktop to start up an entire classroom on one platform or the other, both on a schedule and on demand.
Can you use Bless on a legacy Mac?
The systemsetup command does not support legacy BIOS OSes. However, if you have an EFI Boot of Windows on the 2013 MPs, then bless will not work. You can check the BIOS mode on the Windows side using msinfo32. The 2012 Macs are preUEFI, while 2013 models support both BIOS and EFI on the UEFI Macs up to 2015 models. That did totally work!
Why did bless stop working on my Mac?
However, this stopped working sometime around Mavericks, because the name of the boot volume seemed to randomly be either EFI Boot or Macintosh HD. I’ve been researching this a lot, and came across how “bless” is depreciated and I should use systemsetup after disabling csrutil.
Why does bless not work on a 2013 MPs?
However, if you have an EFI Boot of Windows on the 2013 MPs, then bless will not work. You can check the BIOS mode on the Windows side using msinfo32. The 2012 Macs are preUEFI, while 2013 models support both BIOS and EFI on the UEFI Macs up to 2015 models. So if I run this: sudo systemsetup -liststartupdisks