udisks command completely remove and power off any usb device mounted or attached in the system unmount command just unmount the partition ie: dev/sdb1 or whatever but the usb is still present in the system.
So is not the same unmount, eject and detach
udisks = power off the usb
umount = just unmount the partition not the whole pendrive
eject = the same or very close to umount command
udisks --detach /dev/sdX where (X) is the last letter of your usb device. It works fine on any linux system.diskutil eject /Volumes/<LABEL>
sudo eject /dev/sda
umount <mount point> To see mount point user mount command
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