def ruby_file?(file)
!!file.readlines[0].match(/#!.*ruby/) || File.extname(file.path) == ".rb"
end

def bash_file?(file)
!!file.readlines[0].match(/#!.*bash/) || File.extname(file.path) == ".sh"
end

def valid?(file_name)
system('ruby', '-c', file_name)
end

def valid?(file_name)
system('bash', '-n', file_name)
end

Dir["**/*"].each do |file_name|
  file = File.new file_name
  next if file.binmode? || !ruby_file?(file) # || !bash_file?(file)
  puts "#{file_name}: #{valid? file_name}"
end