ruby-uebungen/Assignment_027/solution/readme.md

# Lösung: Klasse Dir und IO


```ruby
def print(f)
  n = 0
  puts f, "\n"
  IO.foreach(f) do |line|
    puts "%4d %s" % [ n, line ]
    n += 1
  end

  puts "\n\n"

end

Dir.foreach('.') do |f|
  print f  if /.*\.txt$/ =~ f
end
```