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bootadm– manage bootability of GRUB-enabled operating system
The bootadm command manages the boot archive and, with x86 boot environments, the GRUB (GRand Unified Bootloader) menu.
The set-menu subcommand allows you to switch the auto-boot timeout and default boot entry in the GRUB menu.
The list-menu subcommand displays the location of the GRUB menu and the current GRUB menu entries. While the typical location of the GRUB menu is /boot/grub/menu.lst, depending on the install method used the active GRUB menu might be located somewhere else. Use the list-menu subcommand to locate the active GRUB menu. For example, if a system was installed using Live Upgrade, the GRUB menu might not be located in the current boot environment. See the EXAMPLES section for typical output from the list-menu option.
Note that OpenBoot PROM (OBP)-based machines, such as SPARC systems, do not use GRUB and have no boot menu manageable by bootadm.
The bootadm command has the following subcommands:
set-menu
Maintain the GRUB menu. The current GRUB menu is boot/grub/menu.lst, relative to root. Do not depend on this location, because it is subject to change. Applies to x86 platforms only.
list-menu
Lists the location of the active GRUB menu, as well as the current GRUB menu entries. This includes the autoboot-timeout, the default entry number, and the title of each entry. Applies to x86 platforms only.
key=value
Possible values are:
default=entrynum
The item number (for example, 0, 1, or 2) in the GRUB menu designating the operating system to boot when the timer expires.
timeout=seconds
The number of seconds before the operating system designated by the default item number is booted. If the value is –1, auto boot is disabled.
Examples
Example 1 Updating the Current Boot Archive
The following command lists the installed operating system instances in a GRUB menu:
# bootadm list-menu
default=0timeout=10(0) Solaris10(1) Solaris10 Failsafe(2) Linux
Example 2 Switching Default Boot Entry
The following command refers to the menu displayed in the previous example. The user selects Linux (item 2).
# bootadm set-menu default=2