Using a mixin to extend the object instance with the functionality we want

files2.rb

module Logfiles
  def name
    self.sub(/\.gz$/)
  end

  def skip?
    !(@options[:unzip] && self.gzip?)
  end

  def gzip?
    self.match(/\.gz$/)
  end

  def cleanup
    system "gzip #{self.name}" if self.gzip?
  end
end

Dir['*'].each do |file|
  file.extend Logfiles

  next if file.skip?

  IO.foreach(file.name) do |line|
    #...
  end

  file.cleanup
end

I like the riff generalization