Letter: U
- udev-039-10.15.EL4: A userspace implementation of devfs
- up2date-4.4.69-25: Determines which system packages need to be updated via RHN.
- up2date-gnome-4.4.69-25: A GUI interface for Update Agent.
- util-linux-2.12a-16.EL4.20: A collection of basic system utilities.