Demonstration of PTY for Automating Interactive Applications

pty_demo.rb

#!/usr/bin/ruby
require 'expect'
require 'pty'


# PTY without expect can easily automate interactive programs...
PTY.spawn('./inter.rb'){|o,i,p|
  i.puts("yes")
  o.gets #not needed to work just included it to clean up look on-screen
  i.puts("yes")
  o.gets
  i.puts("yes")
  o.gets
  begin
    o.each_line{|k|
      puts k
    }
  rescue Errno::EIO
  ensure
    Process.wait p
  end 
}

# PTY without expect can easily automate interactive programs...
PTY.spawn('fdisk /dev/sda'){|o,i,p|
  i.puts('p')
  o.gets
  i.puts('m')
  o.gets
  i.puts('l')
  o.gets
  i.puts('q')
  o.gets
  begin
    o.each_line{|k|
      puts k
    }
  rescue Errno::EIO
  ensure
    Process.wait p
  end 
}

# There may be times to bring in Expect. Some programs will note respond 
# unless you have expect involved... sync is included to ensure that we 
# get output in real-time.
PTY.spawn('ssh localhost'){|o,i,p|
  #o.sync = true
  #i.sync = true
  $expect_verbose = true  # shows actions on screen
  if o.expect(/yes\/no/, 1)
    i.puts('yes')
    o.expect(/[Pp]assword/)
    i.puts('sister')
    o.expect(/[#$]/)
    i.puts('dmidecode -t bios')
    i.puts('exit')
  else
    o.expect(/[Pp]assword/, 1)
    i.puts('sister')
    o.expect(/[#$]/)
    i.puts('dmidecode -t bios')
    i.puts('exit')
  end
  begin
    o.each_line{|k|
      puts k
    }
  rescue Errno::EIO
  ensure
    Process.wait p
  end 
}