How do I find what debian package ships a given program?

[cga2000 <cga2000@optonline.net>]

Is there a debian utility that returns the name of a package that ships
a given program..?

ie. - You're looking for program "pgm" .. so you type "whichpkg pgm"
from the prompt and the whichpkg utility returns the name of the
package(s).

Thanks,

cga