Extend a (not LVM) partition to use full space of the SDcard

We will use the fdisk utility to delete the too small partition and then recreate a bigger one, making full use of the SDcard space. After what we will resize the file system. All the details are explained here, and below is the set of commands (Credits to mdrjr):

#!/bin/bash

fdisk_first() {
		p2_start=`fdisk -l /dev/mmcblk0 | grep mmcblk0p2 | awk '{print $2}'`
		echo "Found the start point of mmcblk0p2: $p2_start"
		fdisk /dev/mmcblk0 << __EOF__ >> /dev/null
d
2
n
p
2
$p2_start

p
w
__EOF__

		sync
		touch /root/.resize
		echo "Ok, Partition resized, please reboot now"
		echo "Once the reboot is completed please run this script again"
}

resize_fs() {
	echo "Activating the new size"
	resize2fs /dev/mmcblk0p2 >> /dev/null
	echo "Done!"
	echo "Enjoy your new space!"
	rm -rf /root/.resize
}


if [ -f /root/.resize ]; then
	resize_fs
else
	fdisk_first
fi