grubby - command line tool for configuring grub, lilo, and elilo
grubby [--add-kernel=kernel-path] [--args=args]
[--bootloader-probe] [--config-file path]
[--copy-default] [--default-kernel] [--grub]
[--lilo] [--make-default] [-o path]
grubby is a command line tool for updating and displaying information about the configura-
tion files for the grub, lilo, elilo (ia64), and yaboot (powerpc) boot loaders. It is pri-
marily designed to be used from scripts which install new kernels and need to find infor-
mation about the current boot environment.
On Intel x86 platforms, grub is the default bootloader and the configuration file is in
/boot/grub/grub.conf. On Intel ia64 platforms, elilo mode is used and the default location
for the configuration file is /boot/grub/grub.conf. On PowerPC platforms, yaboot parsing
is used and the configuration file should be in /etc/yaboot.conf.
There are a number of ways to specify the kernel used for --info, --remove-kernel, and
--update-kernel. Specificying DEFAULT or ALL selects the default entry and all of the
entries, respectively. If a comma separated list of numbers is given, the boot entries
indexed by those numbers are selected. Finally, the title of a boot entry may be specified
by using TITLE=title as the argument; all entries with that title are used.
Add a new boot entry for the kernel located at kernel-path.
When a new kernel is added, this specifies the command line arguments which should
be passed to the kernel by default (note they are merged with the arguments from
the template if --copy-default is used). When --update-kernel is used, this speci-
fies new arguments to add to the argument list. Multiple, space separated arguments
may be used. If an argument already exists the new value replaces the old values.
The root= kernel argument gets special handling if the configuration file has spe-
cial handling for specifying the root filesystem (like lilo.conf does).
When grubby is looking for a entry to use for something (such as a template or a
default boot entry) it uses sanity checks, such as ensuring that the kernel exists
in the filesystem, to make sure entries that obviously won't work aren't selected.
This option overrides that behavior, and is designed primarily for testing.
The grub boot loader expects file paths listed in it's configuration path to be
relative to the top of the filesystem they are on, rather then relative to the cur-
rent root filesystem. By default grubby searches the list of currently mounted
filesystems to determine this. If this option is given grubby acts as if the speci-
fied filesystem was the filesystem containing the kernel (this option is designed
primarily for testing).
grubby tries to determine if grub or lilo is currently installed. When one of those
bootloaders is found the name of that bootloader is displayed on stdout. Both
could be installed (on different devices), and grubby will print out the names of
both bootloaders, one per line. The probe for grub requires a commented out boot
directive grub.conf identical to the standard directive in the lilo configuration
file. If this is not present grubby will assume grub is not installed (note that
anaconda places this directive in grub.conf files it creates). This option is only
available on ia32 platforms.
Use path as the configuration file rather then the default.
grubby will copy as much information (such as kernel arguments and root device) as
possible from the current default kernel. The kernel path and initrd path will
never be copied.
Display the full path to the current default kernel and exit.
Use an elilo style configuration file.
--grub Use a grub style configuration file instead of lilo style. This is the default on
Display information on all boot entries which match kernel-path. I
Use initrd-path as the path to an initial ram disk for a new kernel being added.
--lilo Use a lilo style configuration file.
Make the new kernel entry being added the default entry.
The arguments specified by kernel-args are removed from the kernels specified by
--update-kernel. The root argument gets special handling for configuration files
that support separate root filesystem configuration.
Removes all boot entries which match kernel-path. This may be used along with
--add-kernel, in which case the new kernel being added will never be removed.
The first entry which boots the specified kernel is made the default boot entry.
When a new kernel entry is added entry-title is used as the title (lilo label) for
the entry. If entry-title is longer then maximum length allowed by the bootloader
(15 for lilo, unlimited for grub and elilo) the title is shortened to a (unique)
The entries for kernels matching kernel-path are updated. Currently the only items
that can be updated is the kernel argument list, which is modified via the --args
and --remove-args options.
Display the version of grubby being run and then exit immediately.
Use an yaboot style configuration file.
The command line syntax is more then a little baroque. This probably won't be fixed as
grubby is only intended to be called from shell scripts which can get it right.
grub(8), lilo(8), yaboot(8), mkinitrd(8)
Erik Troan <email@example.com>
4th Berkeley Distribution Thu Jun 21 2002 GRUBBY(8)