delpart (8) - Linux Manuals
delpart: tell the kernel to forget about a partition
delpart - tell the kernel to forget about a partition
delpart asks the Linux kernel to forget about the specified partition (a number) on the specified device. The command is a simple wrapper around the "del partition" ioctl.
For bug reports, use the issue tracker at <https://github.com/karelzak/util-linux/issues>.
The delpart command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.