how to verify installed packages ?

[Xavier Bestel <xavier.bestel@free.fr>]

Is there a command to verify the integrity of installed packages ? I
want something similar to the rpm --verify command (it verifies the
size, MD5 sum, permissions, type, owner and group of each file), but
couldn't find ti in the docs (and what tool to use ? dpkg, dselect,
apt-get ?).

Thanks,
	Xav