class Digest::Class

def self.file(name, *args)

# => "f02e3c85572dc9ad7cb77c2a638e3be24cc1b5bea9fdbb0b0299c9668475c534"
p Digest::SHA256.file("X11R6.8.2-src.tar.bz2").hexdigest

class.
Optional arguments are passed to the constructor of the digest
Creates a digest object and reads a given file, _name_. 
def self.file(name, *args)
  new(*args).file(name)
end