The dpkg utility works at a layer lower than the APT utilities do. APT uses dpkg behind the scenes to manage software on your Ubuntu system. APT and dpkg work similar to the way yum and rpm do on Red Hat–based Linux distributions. Usually, APT will have enough functionality to get you through just about anything, but there are times when dpkg will be needed, such as finding out which package is associated with a given file on your system. Following are some of the common dpkg command options and parameters.