bless in Mac OS X
By: Strauss K
Set
volume bootability and set the active boot volume.
bless has 5 modes of execution: Folder Mode, Mount Mode, Device Mode, NetBoot
Mode, and Info Mode.
Syntax (brief) Info Mode: --info [dir] Print blessing information for a specific volume, or the currently active boot volume if dir is not specified --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: --file file Set file as the blessed boot file --folder dir Set dir as the blessed directory --bootinfo [file] Use file to create a "BootX" file in the blessed dir --bootefi [file] Use file to create a "boot.efi" file in the blessed dir --setBoot Set firmware to boot from this volume --openfolder dir Set dir to be the visible Finder directory --verbose Verbose output Mount Mode: --mount dir Use this mountpoint in conjunction with --setBoot --file file Set firmware to boot from file --setBoot Set firmware to boot from this volume --verbose Verbose output Device Mode: --device dev Use this block device in conjunction with --setBoot --setBoot Set firmware to boot from this volume --verbose Verbose output NetBoot Mode: --netboot Set firmware to boot from the network --server url Use BDSP to fetch boot parameters from url --verbose Verbose output Syntax (Detailed) bless --folder directory [--folder9 directory] [--file file] [--bootinfo [file]] [--bootefi [file]] [--bootBlockFile file] [--save9] [--saveX] [--use9] [--label name | --labelfile file] [--setBoot] [--openfolder directory] [--nextonly] [--shortform] [--legacy] [--legacydrivehint device] [--options string] [--quiet | --verbose] bless --mount directory [--file file] [--setBoot] [--nextonly] [--shortform] [--legacy] [--legacydrivehint device] [--options string] [--quiet | --verbose] bless --device device [--label name | --labelfile file] [--startupfile file] [--setBoot] [--nextonly] [--shortform] [--legacy] [--legacydrivehint device] [--options string] [--quiet | --verbose] bless --netboot --server url [--nextonly] [--options string] [--quiet | --verbose] bless --info [directory] [--getBoot] [--plist] [--quiet | --verbose] [--version] bless -help
EXAMPLES
FOLDER
MODE
To bless a volume with only Mac OS 9:
bless --folder9 "/Volumes/Mac OS 9/System Folder" --bootBlockFile "/usr/share/misc/bootblockdata"
To bless a volume with only Mac OS X or Darwin, and create the BootX and boot.efi files as needed:
bless --folder "/Volumes/Mac OS X/System/Library/CoreServices" --bootinfo --bootefi
MOUNT
MODE
To set a volume containing either Mac OS 9 and Mac OS X to be the active volume:
bless --mount "/Volumes/Mac OS" --setBoot
NETBOOT
MODE
To set the system to NetBoot and broadcast for an available server:
bless --netboot --server bsdp://255.255.255.255
INFO
MODE
To gather information about the currently selected volume (as determined by the
firmware), suitable for piping to a program capable of parsing Property Lists:
bless --info --plist
For a full description of all the bless options see man bless the options available for bless may vary according to the version of OS X you are running.
Archived Comments
Most Viewed Articles (in macos ) |
Latest Articles (in macos) |
Comment on this tutorial