dh_listpackages man page
dh_listpackages — list binary packages debhelper will act on
dh_listpackages [debhelper options]
dh_listpackages is a debhelper program that outputs a list of all binary packages debhelper commands will act on. If you pass it some options, it will change the list to match the packages other debhelper commands would act on if passed the same options.
Packages are listed in the order they appear in debian/control.
This program is a part of debhelper.
Joey Hess <firstname.lastname@example.org>