formatsdcard2partitions.sh

#!/bin/sh
#
# Format SD card to two small FAT32 partitions
# for guaranteed usage with embedded devices
# Paul Philippov <paul@themactep.com>
#
show_help() {
  echo "Usage: $0 [OPTIONS]>
Where:
  -d <device>       SD Card device (e.g. /dev/sdc).
  -h                Show this help.
"
    echo "Possible devices:"
    sudo fdisk -x | grep -B1 SD | head -1 | awk '{print $2}' | sed 's/://'
  exit 1
}

# command line arguments
while getopts d:h flag; do
  case ${flag} in
    d) card_device=${OPTARG} ;;
    h) show_help ;;
  esac
done

if [ -z "$card_device" ]; then
  show_help
  exit 1
fi

# create
sudo parted ${card_device} mklabel msdos

# create first partition
sudo parted ${card_device} mkpart primary fat32 1MB 64MB
sudo mkfs.vfat -F32 ${card_device}1

# create second partition
sudo parted ${card_device} mkpart primary fat32 64MB 128MB
sudo mkfs.vfat -F32 ${card_device}2

# show partitions
sudo parted ${card_device} print

echo "Done"