tempfile-right.rb

require 'tempfile'

def tempwrite
  f = Tempfile.new('temp')
  f.puts 'nihanihanihanihatorigairu'
  f.close
  return f
end

temp = tempwrite
GC.start
File.open(temp.path) do |f|
  puts f.gets
end
#=> nihanihanihanihatorigairu