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bless

Set volume boot capability and startup disk options. More information: https://ss64.com/osx/bless.html.

  • 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

  • Set a volume containing either Mac OS 9 and Mac OS X to be the active volume:

bless --mount "{{/Volumes/Mac OS}}" --setBoot

  • Set the system to NetBoot and broadcast for an available server:

bless --netboot --server {{bsdp://255.255.255.255}}

  • 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