bless command is used to set volume bootability characteristics and start up disk options. Mode can be executed in five different types. They are Folder Mode, Mount Mode, Device Mode, NetBoot Mode, and Info Mode.
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Usage:
REFIt is a boot menu and maintenance toolkit for EFI -based machines like the Intel Macs. You can use it to boot multiple operating systems easily, including triple-boot setups with Boot Camp. It also provides an easy way to enter and explore the EFI pre-boot environment. Aug 28, 2019 I have just cloned the internal hard drive on a Macbook Pro 2013 to an SSD drive, but I keep getting 'Running bless to place boot files failed” message if I try to boot from it.
The Syntax is
[--bootinfo [file]] [--bootefi [file]]
[--setBoot] [--openfolder directory] [--verbose]
bless --mount directory [--file file] [--setBoot] [--verbose]
bless --device device [--setBoot] [--verbose]
bless --netboot --server url [--verbose]
Options:
Folder Mode Bless Boot Dmg Free
Info Mode:
| Options | Description |
| --info [dir] | Print blessing information for a specific volume, or the currently active boot volume if |
| --getBoot | Suppress normal output and print the active boot volume |
| --version | Print bless version number |
| --plist | For any output type, use a plist representation |
| --verbose | Verbose output |
File/Folder Mode:
| Options | Description |
| --file file | Set |
| --folder dir | Set |
| --bootinfo [file] | Use |
| --bootefi [file] | Use |
| --setBoot | Set firmware to boot from this volume |
| --openfolder dir | Set |
| --verbose | Verbose output |
Mount Mode:
| Options | Description |
| --mount dir | Use this mountpoint in conjunction with --setBoot |
| --file file | Set firmware to boot from |
| --setBoot | Set firmware to boot from this volume |
| --verbose | Verbose output |
Device Mode:
| Options | Description |
| --device dev | Use this block device in conjunction with --setBoot |
| --setBoot | Set firmware to boot from this volume |
| --verbose | Verbose output |
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