This tool will set the mapvar Shell environment
variable to the device mapping the tool is run
from.
Usage:
Shell> ShellMapVar.efi
Shell> %mapvar%
fs0:\>
This is primarily interesting for writing robust UEFI Shell startup scripts, since many commands and tools don't work correctly without a mapping and the actual mapping depends on the mappings present.
Example:
ShellMapVar.efi
%mapvar%
load path\to\my\driver.efi