bless in Mac OS X
By: Strauss K in macos Tutorials on 2011-02-03
bless
is a command line utility in macOS that sets a disk's boot information. It can also be used to select the startup disk, set the firmware boot device, or change the volume's Universal Unique Identifier (UUID) prefix.
Here are some common uses of the bless
command:
-
Set the startup disk:
sudo bless --mount /Volumes/MyDisk --setBoot
This command sets the startup disk to the volume mounted at/Volumes/MyDisk
. -
Set the firmware boot device:
sudo bless --device /dev/disk0s2 --setBoot --nextonly
This command sets the firmware boot device to the device at/dev/disk0s2
, but only for the next boot. -
Change the UUID prefix:
sudo bless --folder /Volumes/MyDisk/System/Library/CoreServices --uuid <new prefix>
This command changes the UUID prefix of the volume's system folder to the specified value.
Note that bless
should be used with caution, as incorrect usage can render a system unbootable.
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