howto post configure a debian installation

["Santanu Chatterjee" <thisissantanu@gmail.com>]

Hello Everybody,

Sorry for asking this question... I really should be looking into the docs,
but I just thought asking here would be faster :-)

I just installed debian testing on a system, but did not configure
networking, apt repositories, and did not even run tasksel. So
I have a very basic installation.

I know that there is a command to setup certain aspects of a debian
installation _after_ the installation. I just cannot remember the name of
that command right now. Please help.

Thanks in advance.

Regards,
Santanu Chatterjee