growpart

Extend partition n to fill empty space until end of disk

$ growpart /dev/sdX [n]

$ growpart -N /path/to/disk.img [n]

growpart [options] disk partition-number

growpart extends a partition to fill available free space following it on a disk. It is commonly used after enlarging a virtual disk or cloud volume to make the added space available to the partition.
The tool works with both physical disks (like /dev/sda) and disk image files. It automatically handles partition table updates for both MBR and GPT partition schemes.
After growing a partition, you typically need to resize the filesystem within it using tools like resize2fs (ext4), xfs_growfs (XFS), or btrfs filesystem resize (Btrfs).

-N, --dry-run

Show what would be done without making changes

Update type: auto, growfs, off

Enable verbose output

Display help message

Only grows partitions into immediately following free space. Cannot grow partitions that have other partitions after them without first moving those partitions. Requires unmounting or using a live system for root partition resizing.

growpart is part of the cloud-utils package, developed by Canonical for Ubuntu and widely used in cloud environments. It was created to simplify the common task of expanding partitions when virtual disks are resized.

fdisk(8), parted(8), resize2fs(8), xfs_growfs(8)