how to verify installation?

[Mike McMullin]

On Thu, 2008-08-21 at 17:39 -0400, Brian McKee wrote:
> On Thu, Aug 21, 2008 at 5:00 PM, Randall J. Parr <RParr at temporalarts.com> wrote:
> > On an RPM based system I can verify the installation against the package
> > files and find out which files are missing or different than in the rpm
> > file.
> >
> > How do I do the equivalent verification (or something similar) on a
> > Debian/Ubuntu deb based system?
> 
> I think you are looking for 'debsums' which is a separate program.
> I have no experience with it.
> I wonder how useful that is considering the number of files that are
> changed/added after installation of a package though.

  On an RPM based system rpm -q <packageanme> tells you what version is
installed, if it is indeed installed, you can also get dependancy info
et al.  Surely Debian based systems have a toll for this sort of thing?