FooooScriptインタプリタっぽいもの

foooo.rb

#/usr/bin/env ruby
# coding: utf-8
# ^ coding: is correct
def foooo
  File.open(ARGV[0]){|f|
      f.each do |line|
          # Don't use "unless-else-end"
          if /fo+/i =~ line
              print "foooo"
          else
              # should be abort?
              abort "Error"
          end
      end
      puts # use puts with no argument to return
  }
end

foooo