man efibootmgr Command

Man page for apt-get efibootmgr Command

Man Page for efibootmgr in Linux

Ubuntu Man Command : man efibootmgr

Man Efibootmgr  Command

This tutorial shows the man page for man efibootmgr in linux.

Open terminal with 'su' access and type the command as shown below:
man efibootmgr

Result of the Command Execution shown below:

EFIBOOTMGR(8)                                                                                                                                          EFIBOOTMGR(8)



NAME
efibootmgr manipulate the EFI Boot Manager

SYNOPSIS
efibootmgr [ a ] [ A ] [ b XXXX ] [ B XXXX ] [ c ] [ d DISK ] [ e 1|3| 1 ] [ E NUM ] [ g ] [ H XXXX ] [ i NAME ] [ l NAME ] [ L LABEL ] [ n
XXXX ] [ N ] [ o XXXX,YYYY,ZZZZ ... ] [ O ] [ p PART ] [ q ] [ t seconds ] [ T ] [ u ] [ U XXXX ] [ v ] [ V ] [ w ] [ @ file ]


DESCRIPTION
efibootmgr is a userspace application used to modify the Intel Extensible Firmware Interface (EFI) Boot Manager. This application can create and destroy
boot entries, change the boot order, change the next running boot option, and more.

Details on the EFI Boot Manager are available from the EFI Specification, v1.02 or later, available from:


Note: efibootmgr requires that the kernel support access to EFI non volatile variables (through /proc/efi/vars on 2.4 kernels, /sys/firmware/efi/vars
on 2.6 kernels). modprobe efivars should do the trick.

OPTIONS
The following is a list of options accepted by efibootmgr:

a | active
Sets bootnum active

A | inactive
Sets bootnum inactive

b | bootnum XXXX
Modify BootXXXX (hex)

B | delete bootnum
Delete bootnum (hex)

c | create
Create new variable bootnum and add to bootorder

d | disk DISK
The disk containing the loader (defaults to /dev/sda)

e | edd 1|3| 1
Force EDD 1.0 or 3.0 creation variables, or guess.

E | device NUM
EDD 1.0 device number (defaults to 0x80)

g | gpt
Force disk with invalid PMBR to be treated as GPT

H | acpi_hid XXXX
set the ACPI HID (used with i)

i | iface NAME
create a netboot entry for the named interface

l | loader NAME
Specify a loader (defaults to \elilo.efi)

L | label LABEL
Boot manager display label (defaults to "Linux")

n | bootnext XXXX
Set BootNext to XXXX (hex)

N | delete bootnext
Delete BootNext

o | bootorder XXXX,YYYY,ZZZZ
Explicitly set BootOrder (hex)

O | delete bootorder
Delete BootOrder

p | part PART
Partition number containing the bootloader (defaults to 1)

q | quiet
Quiet mode supresses output.

test filename
Don't write to NVRAM, write to filename.

t | timeout seconds
Boot Manager timeout, in seconds.

T | delete timeout
Delete Timeout variable.

u | unicode | UCS 2
pass extra command line arguments as UCS 2 (default is ASCII)

U | acpi_uid XXXX
set the ACPI UID (used with i)

v | verbose
Verbose mode prints additional information

V | version
Just print version string and exit.

w | write signature
write unique signature to the MBR if needed

@ | append binary args
append extra variable args from file (use to read from stdin). Data in file is appended as command line arguments to the boot loader command, with
no modification to the data, so you can pass any binary or text data necessary.

EXAMPLES
1.

DISPLAYING THE CURRENT SETTINGS (MUST BE ROOT).
[root@localhost ~]


Related Topics

Apt Get Commands