Expand filesystem to fill up SD card on raspberry pi on non-raspbian distros like kali linux

expandSDfilesystemRpi.sh

sudo su
cat <<EOF > /etc/init.d/resize2fs_once
#!/bin/sh
### BEGIN INIT INFO
# Provides:          resize2fs_once
# Required-Start:
# Required-Stop:
# Default-Start: 2 3 4 5 S
# Default-Stop:
# Short-Description: Resize the root filesystem to fill partition
# Description:
### END INIT INFO
. /lib/lsb/init-functions
case "$1" in
  start)
    log_daemon_msg "Starting resize2fs_once" &&
    resize2fs /dev/root &&
    rm /etc/init.d/resize2fs_once &&
    update-rc.d resize2fs_once remove &&
    log_end_msg $?
    ;;
  *)
    echo "Usage: $0 start" >&2
    exit 3
    ;;
esac
EOF
chmod +x /etc/init.d/resize2fs_once
update-rc.d resize2fs_once defaults