晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/thread-self/root/usr/share/doc/efibootmgr/README
This is efibootmgr, a Linux user-space application 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 above, available from: http://www.uefi.org

Note: efibootmgr requires that the kernel module efivars be loaded
prior to use. Running 'modprobe efivars' should do the trick.

usage: efibootmgr [options]
        -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       (defaults to /dev/sda) containing loader
        -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 w/ invalid PMBR to be treated as GPT
        -i | --iface name      create a netboot entry for the named interface
        -l | --loader name     (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          (defaults to 1) containing loader
        -q | --quiet              be quiet
        -t | --timeout seconds    Boot manager timeout
        -T | --delete-timeout     delete Timeout value
        -u | --unicode | --UCS-2  pass extra args as UCS-2 (default is ASCII)
        -v | --verbose            print additional information
        -V | --version            return version and exit
        -w | --write-signature    write unique sig to MBR if needed
        -@ | --append-binary-args append extra variable args from
                                  file (use - to read from stdin).


Typical usage:

Root can use it to display the current Boot Manager settings.

[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

This shows:
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 on 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 superceeds 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 BootOrder.

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), the active/inactive flag (* means
active), and the name displayed on the screen.

Alternative use cases could be as follows:

1) 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.

2) A system administrator wants to change the boot order. She would
   call 'efibootmgr -o 3,4' to specify PXE boot first, then Linux
   boot.

3) A system administrator wants to change the boot order for the next
   boot only. She would call 'efibootmgr -n 4' to specify that the
   Linux entry be taken on next boot.

4) A system administrator wants to delete the Linux boot option from
   the menu. 'efibootmgr -b 4 -B' deletes entry 4 and removes it
   from BootOrder.

5) A system administrator wants to create a boot option to network
   boot (PXE).  You create the boot entry with:
   'efibootmgr -c -i eth0 -L netboot'

Please direct any bugs, features, patches, etc. to Peter Jones:

https://github.com/rhboot/efibootmgr

haha - 2025