|| <code>rpm -q --requires ''package''</code>

|| <code>dpkg-query -W -f='${Depends}\n' ''package''</code>

|-

! Which installed package(s) provide a given ''dependency''<ref name="dep">In rpm world, a ''dependency'' can be a package name, a file, or a special atom like <code>perl(IO::Zlib)</code> for a perl module. In deb world, this can be either real or virtual package name.</ref>?

|| <code>rpm -q --whatrequires ''dependency''</code>

|| <code>dpkg-query -W -f='${Package}: ${Depends}\n' '*' | grep ': .*package'</code><br><code>aptitude why package</code><ref name="why">Actualy shows the whole dpendency situation that leads to install this package</ref>

|-

! Show what prevents installation of a package

|| <code>-???-</code>

|| <code>aptitude why-not package</code>

|-

! Get package source files

|| <code>-???-</code>

|| <code>apt-get source ''package''</code>

|-

! colspan="4" align="center" | <big>'''Working with package files'''</big>