Create multiboot USB stick on macOS

README.md

Based on https://www.pendrivelinux.com/boot-multiple-iso-from-usb-via-grub2-using-linux/#more-5352

Install Homebrew

Install grub

brew install i386-elf-grub

Prepare USB stick

USBDEV=disk6  # use "diskutil list" to determine device

sudo diskutil unmountDisk $USBDEV

sudo diskutil eraseDisk FAT32 MULTIBOOT MBR $USBDEV

sudo diskutil mountDisk $USBDEV

sudo /usr/local/opt/i386-elf-grub/sbin/i386-elf-grub-install --force --no-floppy --boot-directory=/Volumes/MULTIBOOT/boot /dev/r$USBDEV