If the device is not mounted
sudo blockdev --rereadpt DEVICE
E.g.
sudo blockdev --rereadpt /dev/sda
If the device is mounted
Parted is awesome and does this job amazingly.
sudo apt-get install parted
sudo partprobe
sudo blockdev --rereadpt DEVICE
E.g.
sudo blockdev --rereadpt /dev/sda
Parted is awesome and does this job amazingly.
sudo apt-get install parted
sudo partprobe