Provided by: efibootmgr_17-1ubuntu2_amd64 bug


       efibootmgr - manipulate the UEFI Boot Manager


       efibootmgr  [  -a  ]  [ -A ] [ -b XXXX ] [ -r | -y ] [ -B ] [ -c ] [ -d DISK ] [ -D ] [ -e
       1|3|-1 ] [ -E NUM ] [ -g ] [ -i NAME ] [ -l NAME ] [ -L LABEL ] [ -m t|f ] [ -M X ]  [  -n
       XXXX  ] [ -N ] [ -o XXXX,YYYY,ZZZZ ... ] [ -O ] [ -p PART ] [ -q ] [ -t seconds ] [ -T ] [
       -u ] [ -v ] [ -V ] [ -w ] [ -@ file ]


       efibootmgr is a  userspace  application  used  to  modify  the  UEFI  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 UEFI Boot Manager are available  from  the  UEFI  Specification,  v1.02  or
       later, available from:

              Note:  efibootmgr  requires  that  the  kernel  support  access to EFI non-volatile
              variables through /sys/firmware/efi/vars or /sys/firmware/efi/efivars/.


       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

       -c | --create
              Create new variable bootnum and add to bootorder

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

       -D | --remove-dups
              Remove duplicated entries from BootOrder

       -e | --edd30 1|3|-1
              Force EDD 1.0 or 3.0 creation variables, or guess.

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

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

       -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")

       -m | --mirror-below-4G t|f
              Set t if you want to mirror memory below 4GB

       -M | --mirror-above-4G X
              X percentage memory to mirror above 4GB. Floating-point value with up to 2  decimal
              places is accepted.

       -n | --bootnext XXXX
              Set BootNext to XXXX (hex)

       -N | --delete-bootnext
              Delete BootNext

       -o | --bootorder XXXX,YYYY,ZZZZ
              Explicitly  set BootOrder (hex). Any value from 0 to FFFF is accepted so long as it
              corresponds to an existing Boot#### variable, and zero padding is not required.

       -O | --delete-bootorder
              Delete BootOrder

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

       -q | --quiet
              Quiet mode - supresses output.

       -r | --driver
              Operate on Driver#### variables instead of Boot#### variables.

       -t | --timeout seconds
              Boot Manager timeout, in seconds.

       -T | --delete-timeout
              Delete Timeout variable.

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

       -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

       -y | --sysprep
              Operate on SysPrep#### variables instead of Boot#### variables.

       -@ | --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.


   Displaying the current settings (must be root):

       [root@localhost ~]# efibootmgr
       BootCurrent: 0004
       BootNext: 0003
       BootOrder: 0004,0000,0001,0002,0003
       Timeout: 30 seconds
       Boot0000* Diskette Drive(device:0)
       Boot0001* CD-ROM Drive(device:FF)
       Boot0002* Hard Drive(Device:80)/HD(Part1,Sig00112233)
       Boot0003* PXE Boot: MAC(00D0B7C15D91)
       Boot0004* Linux

       Each of the above are boot variables, which are defined as follows:

              • BootCurrent - the boot entry used to start the currently running system

              • BootOrder - the boot order as would appear in the boot manager.  The boot manager
                tries  to boot the first active entry in this list. If unsuccessful, it tries the
                next entry, and so on.

              • BootNext - the boot entry which is  scheduled  to  be  run  on  next  boot.  This
                supercedes  BootOrder for one boot only, and is deleted by the boot manager after
                first use. This allows you to change the  next  boot  behavior  without  changing

              • Timeout - the time in seconds between when the boot manager appears on the screen
                until when it automatically chooses the startup value from BootNext or BootOrder.

              • Five boot entries (0000 - 0004), along with the  active/inactive  flag  (*  means
                active) and the name displayed on the screen.

   Creating a new boot option
       An  OS installer would call efibootmgr -c.  This assumes that /boot/efi is your EFI System
       Partition, and is mounted at /dev/sda1. This creates a new boot  option,  called  "Linux",
       and puts it at the top of the boot order list. Options may be passed to modify the default
       behavior. The default OS Loader is elilo.efi.

   Changing the boot order
       Assuming the configuration in the first example, efibootmgr -o  3,4  could  be  called  to
       specify PXE boot first, then Linux boot.

   Changing the boot order for the next boot only
       Assuming  the  configuration  in  the  first  example,  efibootmgr -n 4 could be called to
       specify that the Linux entry be taken on next boot.

   Deleting a boot option
       Assuming the configuration in the first example, efibootmgr -b 4 -B  could  be  called  to
       delete entry 4 and remove it from the BootOrder.

   Creating network boot entries
       A  system administrator wants to create a boot option to network boot. You create the boot
       entry with: efibootmgr -c -i eth0 -L netboot [ -l '\filename.efi' ]


       Please direct any bugs, features,  patches,  etc.  to  the  Red  Hat  bootloader  team  at .


       This  man  page  was generated by dann frazier <> for the Debian GNU/Linux
       operating system and updated by Robert Bisewski <>, but may  be
       used by others.



                                         26 December 2017                           EFIBOOTMGR(8)