FooooScriptインタプリタっぽいもの

foooo.rb

#/usr/bin/env ruby
# code:utf-8 
def foooo
  File::open(ARGV[0]){|f|
      f.each do |line|
          unless(/fo+/i =~ line)
              print "Error"
          else
              print "foooo"
          end
      end
      print "\n"
  }
end

foooo