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GRUBBY(8)                                                            GRUBBY(8)



NAME
       grubby - command line tool for configuring grub, lilo, and elilo


SYNOPSIS
       grubby [--add-kernel=kernel-path] [--args=args]
              [--bad-image-okay] [--boot-filesystem=bootfs]
              [--bootloader-probe] [--config-file path]
              [--copy-default] [--default-kernel]
              [--grub] [--lilo] [--yaboot] [--silo] [--zipl]
              [--info=kernel-path] [--initrd=initrd-path]
              [--make-default] [-o path] [--version]
              [--remove-kernel=kernel-path] [--remove-args=args]
              [--set-default=kernel-path] [--title=entry-title]
              [--add-multiboot=multiboot-path] [--mbargs=args]
              [--remove-multiboot=multiboot-path] [--remove-mbargs=args]


DESCRIPTION
       grubby  is  a  command  line tool for updating and displaying information about the configuration files for the
       grub, lilo, elilo (ia64), yaboot (powerpc) and zipl (s390) boot loaders. It is primarily designed  to  be  used
       from scripts which install new kernels and need to find information 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.  Speci-
       ficying  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.


OPTIONS
       --add-kernel=kernel-path
              Add a new boot entry for the kernel located at kernel-path.


       --args=kernel-args
              When a new kernel is added, this specifies the command line arguments which should be passed to the ker-
              nel by default (note they are merged with the arguments from the template if  --copy-default  is  used).
              When  --update-kernel is used, this specifies 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 special handling for spec-
              ifying the root filesystem (like lilo.conf does).


       --bad-image-okay
              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.


       --boot-filesystem=bootfs
              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  current  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 specified filesystem was the filesystem containing the kernel (this  option  is  designed
              primarily for testing).


       --bootloader-probe
              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 com-
              mented 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 direc-
              tive in grub.conf files it creates).  This option is only available on ia32 platforms.



       --config-file=path
              Use path as the configuration file rather then the default.


       --copy-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.


       --default-kernel
              Display the full path to the current default kernel and exit.


       --elilo
              Use an elilo style configuration file.


       --grub Use a grub style configuration file instead of lilo style. This is the default on ia32 platforms.


       --info=kernel-path
              Display information on all boot entries which match kernel-path. I


       --initrd=initrd-path
              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-default
              Make the new kernel entry being added the default entry.


       --remove-args=kernel-args
              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  con-
              figuration.


       --remove-kernel=kernel-path
              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.


       --set-default=kernel-path
              The first entry which boots the specified kernel is made the default boot entry.


       --title=entry-title
              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) entry.


       --update-kernel=kernel-path
              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.


       --version
              Display the version of grubby being run and then exit immediately.


       --yaboot
              Use an yaboot style configuration file.


       --zipl Use an zipl style configuration file.


MULTIBOOT OPTIONS
       The  Multiboot  Specification  provides a genreic interface for boot loaders and operating systems.  It is sup-
       ported by the GRUB bootloader.


       --add-multiboot=multiboot-path
              Add a new boot entry for the multiboot kernel located at multiboot-path.  Note that  this  is  generally
              accompanied with a --add-kernel option.


       --remove-multiboot=multiboot-path
              Removes all boot entries which match multiboot-path.


       --mbargs=multiboot-args
              When  a  new multiboot kernel is added, this specifies the command line arguments which should be passed
              to that kernel by default When --update-kernel is used, this specifies new arguments to add to the argu-
              ment  list. Multiple, space separated arguments may be used. If an argument already exists the new value
              replaces the old values.


       --remove-mbargs=multiboot-args
              The arguments specified by multiboot-args are removed from the kernels specified by --update-kernel.



BUGS
       The command line syntax is more than 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.


SEE ALSO
       grub(8), lilo(8), yaboot(8), mkinitrd(8)


AUTHORS
       Erik Troan
       Jeremy Katz
       Peter Jones



                                Tue Jan 18 2005                      GRUBBY(8)