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efibootmgr:

efibootmgr is a Linux user-space application which interacts with the Unified Extensible Firmware Interface (UEFI) on the system. This application can create and destroy boot entries, change the boot order, change the next running boot option, and more.

usage: efibootmgr [options] -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 (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 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 (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 | --test filename don't write to NVRAM, write to filename. -t | --timeout seconds set boot manager timeout waiting for user input. -T | --delete-timeout delete Timeout. -u | --unicode | --UCS-2 pass extra args as UCS-2 (default is ASCII) -U | --acpi_uid XXXX set the ACPI UID (used with -i) -v | --verbose print additional information -V | --version return version and exit -w | --write-signature write unique sig to MBR if needed -@ | --append-binary-args file append extra args from file (use "-" for stdin)

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