On Dec 5, 2008, at 1:33 AM, Clark Martin wrote:
> OS X doesn't really have the concept of "blessing" and the term is
> usually not used with OS X.
That's what I thought until I read the man page for "bless" in Terminal.
This is what it says:
BLESS(8) BSD System Manager's Manual
BLESS(8)
NAME
bless -- set volume bootability and startup disk options
SYNOPSIS
bless --help
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]
DESCRIPTION
bless is used to modify the volume bootability characteristics of
filesystems, as well as select the active boot volume. bless
has 5 modes
of execution: Folder Mode, Mount Mode, Device Mode, NetBoot
Mode, and
Info Mode.
Folder Mode allows you to select a directory on a mounted volume
to act
as the ``blessed'' directory, which causes the system firmware
to look in
that directory for boot code. EFI-based systems also support a
``blessed'' system file, which is the primary mechanism of
specifying the
booter for a volume for those systems. In Folder Mode, if you
are operat-
ing on an HFS+ volume, the HFS+ Volume Header is updated to
reflect these
files/directories given.
Mount Mode does not make permament modifications to the
filesystem, but
rather set the system firmware to boot from the specified
volume, assum-
ing it has been properly blessed. This is a subset of the
functionality
of Folder Mode with the --setBoot option, but is convenient when
you
don't want to change or interrogate the filesystem for its
blessed sta-
tus.
Device Mode is similar to Mount Mode, but allows selection of
unmounted
filesystems, for instance while in single user mode. It can also
perform
certain offline modifications to the filesystem, but is not
generally
recommended.
NetBoot Mode sets the system firmware to boot from the network,
using a
URL syntax to specify the protocol and server. bless only sets
the local
system to go into NetBoot mode, and does not communicate to the
server
what image should be used, if there are multiple images. Some
other mech-
anism, such as using Startup Disk, should be used to select that.
Info Mode will print out the currently-blessed directory of a
volume, or
if no mountpoint is specified, the active boot volume that the
firmware
is set to boot from.
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