my $timeout = 5;
my $exp = Expect->new;
$exp->raw_pty(1);
$exp->spawn("su root");
$exp->log_stdout(0);
$exp->expect($timeout,
      [ '-re', 'Password:\s*$' => sub {
                 $exp->send("admin\n");
             }
     ],
     [ timeout => sub { die "Timeout" }  ],
);

#waiting for
#[root@ana-02 ~]#
$exp->expect($timeout,
          [ '-re', '\][#%]\s*$' => sub {} ],
          [ timeout => sub { die "Timeout, no prompt" } ],
);

$exp->log_stdout(1);
my $result = $exp->send("dummy.pl\n");
{
                #Ignoring :: IO::Stty not installed, cannot change mode at test.pl line 22
                local $SIG{__WARN__} = sub {
                my $warn = shift;
                if ($warn !~ /IO::Stty/) {
                        print STDERR $warn;
                }
                };
                $exp->interact();
}
$exp->log_stdout(0);
$exp->expect($timeout,
      [ '-re', '\][#%]\s*$' => sub {
                 $exp->send(" exit\n");
             }
     ],
     [ timeout => sub { die "Timeout" }  ],
);
$exp->soft_close();
my $status  = $exp->exitstatus;
print "$status\n";