bless MacOS command
The bless command in MacOS is a utility used to specify which volume to bless on startup. This command is primarily used to set the blessed volume, which is the startup volume that the system will boot from. By using the bless command, users can choose which volume contains the necessary boot files for the system to start up properly. The bless command has various options that allow users to customize the boot process and ensure that the correct volume is selected for startup. This command is typically run from the Terminal application and requires administrative privileges to make changes to the system’s boot process.
bless Syntax:
bless [options] [parameters]Options:
| Option | Description |
|---|---|
| -info | Display information about the bless configuration for a device. |
| -unbless | Remove an existing blessing from a specified volume. |
| -legacy | Applies legacy boot settings to a specified volume. |
| -setBoot | Set the blessed system folder to the specified folder. |
Parameters:
| Parameter | Description |
|---|---|
| device | Specify the device to bless or unbless. |
| folder | Specify the folder to set as the blessed system folder. |
bless bash Examples:
Set Device as Default Startup Disk
sudo bless --setBoot --device /dev/disk1Set a specific device (/dev/disk1) as the default startup disk.
Get Current Bless Information
bless --infoDisplay information about the current bless settings on the system.
List Bootable Devices
bless --getBootList all devices that can be set as the default startup disk.
Specify an EFI File
sudo bless --mount /Volumes/EFI --file /EFI/BOOT/BOOTX64.efiSpecify an EFI file to boot from a specific partition.
Reset NVRAM
sudo bless --reset --updateReset the NVRAM to the default settings and update bless information.
Unmount EFI Partition
sudo bless --unbless /dev/disk1Unmount the EFI partition on a specific device (/dev/disk1).
How do I use bless in MacOS?
To use the bless command in MacOS, execute the following command:
bless --folder /Volumes/Macintosh\ HD/System/Library/CoreServices --file /Volumes/Macintosh\ HD/System/Library/CoreServices/boot.efi --setBootHow can I set a specific device as the startup disk with bless in MacOS?
To set a specific device as the startup disk using bless in MacOS, use the command:
bless --mount /Volumes/MyDisk --setBootHow do I reset the default startup disk using bless on MacOS?
To reset the default startup disk using bless on MacOS, run this command:
bless --mount / --setBootHow do I show the current blessed system file with bless on MacOS?
To display the current blessed system file using bless on MacOS, use this command:
bless --infoHow can I set a folder’s bootloader file as the default using bless in MacOS?
To set a folder’s bootloader file as the default using bless in MacOS, run:
bless --folder /Volumes/MyDisk/System/Library/CoreServices --file /Volumes/MyDisk/System/Library/CoreServices/boot.efi --setBootHow do I specify the type of system file when blessing with bless on MacOS?
To specify the type of system file when blessing with bless on MacOS, use this command:
bless --folder /System/Library/CoreServices --file /System/Library/CoreServices/boot.efi --filetype bootHow can I view the options and syntax of the bless command in MacOS?
To view the options and syntax of the bless command in MacOS, you can refer to the man page by running:
man blessHow do I remove the bless setting for a specific volume on MacOS?
To remove the bless setting for a specific volume on MacOS, you can use the following command:
bless --unbless /Volumes/MyDiskApplications of the bless command
- Setting the startup disk on a Mac
- Blessing a macOS system folder
- Blessing a macOS bootable volume