Reinstalling lost packages using /var/lib/dpkg/status-old

[lars nooden <lars.nooden@gmail.com>]

If a bunch of packages have been uninstalled, what is an automated way
of reinstalling them using /var/lib/dpkg/status-old or
/var/backups/dpkg.status.* ?

I see a lot of material mentioning status but nothing about precisely
how to use it.

Regards,
/Lars