bash_queue.rb

class BashQueue
  FIFO_QUEUE = '/tmp/channel'

  # Setup fifo queue called channel
  def self.ensure_setup!
    unless ::File.exist?(FIFO_QUEUE)
      `mkfifo #{FIFO_QUEUE}`
    end
  end

  def self.recv
    ensure_setup!
    ::File.read(FIFO_QUEUE)
  end

  def self.send(data)
    ensure_setup!
    ::File.write(FIFO_QUEUE, data)
  end
end


BashQueue.send("Hello?")

# In terminal run: "read line < /tmp/channel; echo $line"

puts BashQueue.recv

# In terminal run: "echo 'Hi! :)' > /tmp/channel"


# OUTPUT:
# -------
# Sending Data
# Recv data
# Hi :)