control-bash-from-ruby

master.rb

require 'pty'
require 'expect'

str = "RUBY_VERSION"

PTY.spawn("./slave.sh") do |reader, writer|
	reader.expect('Hello')
	answer = reader.gets
	puts "stdout: #{answer}"

	sleep 1

	writer.puts('Galaxy')
	reader.expect('Hello')
	answer = reader.gets
	puts "stdout: #{answer}"
end

slave.sh

#/bin/bash
echo "Just wanna say Hello World"
read a
echo "And also say Hello to the $a"