my $sshConf = Net::SSH::Perl::Config->new("1.1.1.1", options => [  ]);
my $hostKey = $sshConf->set("user_known_hosts", "/home/jz/.ssh/ssh_known_hosts");
$sshConf->read_config( '/home/jz/.ssh/config' );
my $ssh = Net::SSH::Perl->new("1.1.1.1");                 
my $cfg = $ssh->config();