How to find the flash drive in GRUB for a cat command?

[longpanda]

It has been noted in the document: https://www.ventoy.net/en/plugin_grubmenu.html  (Special Build-in Variable)
You can just use vtoy_iso_part variable as follows:

Code:

menuentry 'Read VERSIONS.txt' --class=F5tool {
    cat $vtoy_iso_part/VERSIONS.txt
        echo -e "\nPress ENTER to exit..."
        read vtInputKey
}