User of the Mac OS do not typically use UNIX They use the Mac GUI
(Finder) to view files and operate applications. I've been a Mac USER
since about 1986 and I've yet create a Build.
  we have two ways of installing programs. DMG (pronounced DIM-edge) and
stands of Disk Image the overwhelming majority of the way applications
are delivered; and  PKG (Package). Unless we are application developers.

That's the only way deal with programs. with the possible exception of
Apple-scripts and automator actions. I've only dealt with two or three
apple-script and those were given to me; all I had to do was compile and
run them using the Script Editor. I've yet to use Autmator actions for
anything (unless they are done behind the scenes).