#!/usr/bin/perl

use strict;
use warnings;

use Net::OpenSSH;
use Expect;

select STDOUT; $| = 1;
select STDERR; $| = 1;

my $password = "nutterHead";
my $timeout = 20;

my $debug = 0;

my $ssh = Net::OpenSSH->new('netter@sap1902', password => $password);

# After a successful sudo operation, it doesn't request the password
# again until some time after, handling this undeterministic behaviour
# is a pain in the ass, so we just clear any cached credentials
# calling "sudo -k" first as follows:
my ($pty, $pid) = $ssh->open2pty("sap1902") or die "open2pty failed: " . $ssh->error . "\n";

my $expect = Expect->init($pty);
$expect->raw_pty(1);
$debug and $expect->log_user(1);

$debug and print "waiting for password prompt\n";
$expect->expect($timeout, ':') or die "expect failed\n";

$debug and  print "prompt seen\n";

$expect->send("$password\n");
$debug and print "password sent\n";

$expect->expect($timeout, "\n") or die "bad password\n";

$debug and print "password ok\n";

while(<$pty>) {
    print "$. $_"
}


##</code><code>##


perl expect.pl

ssh: illegal option -- M
Usage: ssh [options] host [command]
Options:
  -l user     Log in using this user name.
  -n          Redirect input from /dev/null.
  -F config   Config file (default: ~/.ssh/config).
  -A          Enable authentication agent forwarding.
  -a          Disable authentication agent forwarding (default).
  -X          Enable X11 connection forwarding.
  -x          Disable X11 connection forwarding (default).
  -i file     Identity for public key authentication (default: ~/.ssh/identity)
  -t          Tty; allocate a tty even if command is given.
  -T          Do not allocate a tty.
  -v          Verbose; display verbose debugging messages.
              Multiple -v increases verbosity.
  -V          Display version number only.
  -q          Quiet; don't display any warning messages.
  -f          Fork into background after authentication.
  -e char     Set escape character; ``none'' = disable (default: ~).
  -c cipher   Select encryption algorithm
  -m macs     Specify MAC algorithms for protocol version 2.
  -p port     Connect to this port.  Server must be on the same port.
  -L listen-port:host:port   Forward local port to remote address
  -R listen-port:host:port   Forward remote port to local address
              These cause ssh to listen for connections on a port, and
              forward them to the other side by connecting to host:port.
  -D port     Enable dynamic application-level port forwarding.
  -C          Enable compression.
  -N          Do not execute a shell or command.
  -g          Allow remote hosts to connect to forwarded ports.
  -1          Force protocol version 1.
  -2          Force protocol version 2.
  -4          Use IPv4 only.
  -6          Use IPv6 only.
  -o 'option' Process the option as if it was read from a configuration file.
  -s          Invoke command (mandatory) as SSH2 subsystem.
  -b addr     Local IP address.
open2pty failed: unable to establish master SSH connection: ssh master exited unexpectedly