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my $ssh_b = Net::OpenSSH->new($host_b, ...);
$ssh_b->error and die;
...
my $ssh_c = Net::OpenSSH->new($host_c, master_opts => [-o => "ProxyCom
+mand=$tunnel_cmd"], ...);
$ssh_c->error and die;
$ssh_c->system('ls');

my $ssh_c = Net::OpenSSH->new($host_c, gateway => { proxy => "ssh://$h
+ost_b"}, ...);