xxx-Mac:~xxx$ echo -e 'flag 1nquitnyes' | sudo fdisk -e /dev/disk2

#!/usr/bin/env ruby

`echo -e 'flag 1nquitnyes' | sudo fdisk -e /dev/disk2`

`echo -e 'flag 1\nquit\nyes' | sudo fdisk -e /dev/disk2`
"Enter 'help' for informationnfdisk: 1> Invalid command '-e'. Try 'help'.nfdisk: 1>"

require 'open3'

Open3.popen2('sudo fdisk -e /dev/disk2') { |i,o,t|
  i.puts 'flag 1'
  i.puts 'quit'
  i.puts 'yes'
  i.close
  p o.read
  t.join
}