Arch manual pages

RESIZEPART(8) System Administration RESIZEPART(8)

resizepart - tell the kernel about the new size of a partition

resizepart device partition length

resizepart tells the Linux kernel about the new size of the specified partition. The command is a simple wrapper around the "resize partition" ioctl.

This command doesn't manipulate partitions on a block device.

The disk device.
The partition number.
The new length of the partition (in 512-byte sectors).

addpart(8), delpart(8), fdisk(8), parted(8), partprobe(8), partx(8)

The resizepart command is part of the util-linux package and is available from
January 2015 util-linux