Uefi shell

the EFI shell is a scriptable commandline interface you can use to boot operating systems.

Tutorials

https://techlibrary.hpe.com/docs/iss/proliant_uefi/UEFI_TM_030617/GUID-D7147C7F-2016-0901-0A6D-000000000E1B.html

Basics

devices       # list devices
FS0:          # choose a device to interact with (FS0, FS1, ...)

[command] -?  # show help

# several of shell builtins are available
alias cat ls cd cp dh date ftp

# boot or display boot options
boot dump    # show installed boot options
boot -d      # show boot options in order
boot -n 1    # boot first option

# load uefi driver
load foo.efi