Resize partition to fit SD card [Raspberry Pi]

I often need this… originally from tomahhunt on the Arch Linux forums

The following commands resize the main partition of a new Arch Linux installation on a Raspberry Pi to fit the full disk.

Switch to root (sudo or su)
fdisk /dev/mmcblk0

Delete the second partition /dev/mmcblk0p2:
d > 2

Create a new primary partition and use default sizes prompted. This will then create a partition that fills the disk:
n > p > 2 > enter >enter

Save and exit fdisk:

Now reboot. Once rebooted:
resize2fs /dev/mmcblk0p2