# Starting ssh without password
# 1) run the constructor
my $ssh = Net::SSH::Expect->new (
  host => "myserver.com", 
  user => 'bnegrao', 
  raw_pty => 1
);
# 2) now start the ssh process
$ssh->run_ssh() or die "SSH process couldn't start: $!";
        
# 3) you should be logged on now. Test if remote prompt is received:
($ssh->read_all(2) =~ />\s*\z/) or die "where's the remote prompt?"

$ssh->exec("whoami");
$ssh->exec("/sbin/ifconfig");
$ssh->exec("ls /");

ssh->close();