aptitude search ~N
aptitude search ~U
apt-file list <name>
apt-file find <name>
dpkg -L <name>
aptitude show <name> dpkg -p <name>
aptitude show <name>
dpkg -p <name>
apt-cache rdepends <name> apt-cache showpkg <name>
apt-cache rdepends <name>
apt-cache showpkg <name>