flash_sdcard

#!/bin/bash

input="$1"
output="$2"

if [[ ! -f "$input" ]]; then
    echo "error: input file \"$input\" does not exist"
    echo "$0 <input image> <output device>"
    exit 1
fi

if [[ ! -e "$output" ]]; then
    echo "error: output device \"$output\" does not exist"
    echo "$0 <input image> <output device>"
    exit 1
fi

lsblk "$output" || exit 1

echo "will run:"
echo
echo "    dd if="$1" of="$2" status=progress conv=sync bs=4M"
echo
echo "continue? [y/N]"

read a

if [[ "$a" == "y" ]]; then
    sudo dd if="$1" of="$2" status=progress conv=sync bs=4M
fi