How to resize linux partitions without cd/usb

resize_linux.txt

Resize Linux partition without any disks/cds/usb things!

Works on Ubuntu 14.04, probably fine on others

1.
sudo losetup /dev/loop0

2. /path/to/file is found with 1., xxx is the number of MiBs to allocate, note: 1MiB ~ 1MB
sudo dd if=/dev/zero bs=1MiB of=/path/to/file conv=notrunc oflag=append count=xxx

3.
sudo losetup -c /dev/loop0

4.
sudo resize2fs /dev/loop0