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