delpart

Tell kernel to forget partition 1 of /dev/sda

$ sudo delpart [/dev/sda] [1]

delpart device partition

delpart asks the Linux kernel to forget about a partition. This is a low-level command that updates the kernel's in-memory partition table without modifying the actual partition table on disk.
Used when the on-disk partition table has been modified and the kernel needs to be informed of the change without rebooting.

device

The block device (e.g., /dev/sda)

Partition number to remove

Does not modify the partition table on disk, only kernel's view. The partition must not be in use (mounted, etc.). Changes may be reverted on reboot if the on-disk table differs. Part of util-linux.

addpart(8), partprobe(8), fdisk(8)