make a exfat usb that can be used in macos and (hopefully) windows

mk_exfat_usb.sh

#!/bin/bash

set -e

# https://en.wikipedia.org/wiki/ExFAT
# https://unix.stackexchange.com/questions/460155/mac-os-cannot-mount-exfat-disk-created-on-ubuntu-linux

# Preparation:
# pacman -S parted exfat-utils

# Tested on macOS Catalina

if ! [ -b "$1" ]; then
  echo "$1 is not a block device"
  exit 255
fi
echo "USB: $1"

echo parted -s -a optimal $1 mktable gpt mkpart fat32 0% 100% set 1 msftdata on
parted -s -a optimal $1 mktable gpt mkpart fat32 0% 100% set 1 msftdata on

echo mkfs.exfat -n usb "$1"1
mkfs.exfat -n usb "$1"1