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bless:tldr:eaf0c

bless: 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
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The bless command in macOS is used to set the startup disk and/or bless a specific folder or file to be used for booting.

Now let's break down the given command:

bless --folder ${-Volumes-Mac OS X-System-Library-CoreServices} --bootinfo --bootefi

  1. bless - The command itself.

  2. --folder - Specifies that a folder should be blessed instead of a specific file.

  3. ${-Volumes-Mac OS X-System-Library-CoreServices} - This is the path to the folder that will be blessed.

    • ${-Volumes-Mac OS X-System-Library-CoreServices} appears to be an incomplete or improperly formatted command substitution. A proper command substitution should start with a dollar sign followed by an opening parenthesis, without any dashes. We could assume that it is attempting to reference a specific folder path.
    • The given path: -Volumes-Mac OS X-System-Library-CoreServices seems to contain spaces and may not be a valid path.

  4. --bootinfo - Specifies that boot information should be updated and output by the command.

  5. --bootefi - Specifies that the EFI (Extensible Firmware Interface) boot code should be updated and output by the command.

In summary, it seems that the given command is attempting to bless a folder with an incomplete or incorrect path. It also instructs the bless command to update boot information and the EFI boot code.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.
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