or download this
[~/src/Net-SSH-0.01] $ perl -Iblib/lib -mNet::SSH
$s=Net::SSH::->new("host1");
$s->login("xxxxx","xxxxx");
...
Received server public key (768 bits) and host key (1024 bits).
Can't open /etc/ssh_known_hosts:
No such file or directory at - line 3