sfdisk

Back up the partition layout to a file

$ sudo sfdisk -d [/dev/sdX] > [path/to/file.dump]

$ sudo sfdisk [/dev/sdX] < [path/to/file.dump]

$ sudo sfdisk --part-type [/dev/sdX] [partition_number] [swap]

$ sudo sfdisk --delete [/dev/sdX] [partition_number]

sfdisk [options] device

sfdisk is a scriptable partition table manipulator. Unlike interactive tools like fdisk, sfdisk is designed for non-interactive use, making it ideal for backup/restore operations and automated partitioning scripts.
The dump format is human-readable and can be edited before restoring. This makes it useful for cloning partition layouts between identical disks.

-d, --dump

Dump partition table in sfdisk-compatible format

List partitions on a device

Delete a partition

Set or change partition type

Dry run; don't write changes

Backup partition table sectors before changes

Disable all consistency checks

Check partition table consistency

Output in JSON format

Requires root privileges. Modifying partition tables can cause data loss; always backup important data first. The partition layout must be compatible with the target disk's geometry. Part of the util-linux package.

fdisk(8), parted(8), gdisk(8), partprobe(8)