Does the code you provided work for you on linux ? It doesn't for me. Seems to me that as soon as you '$chan->shell();' you lose the capability to get the output. There's simply nothing there to be read. To get the output, I find I have to '$chan->exec("command");'. Here's a demo that works for me on Windows:

use Net::SSH2;
use warnings;
use strict;

my $buflen = 100;
my $buf = '0' x $buflen;

my $ssh2 = Net::SSH2->new();

$ssh2->connect('192.168.0.3') or die;

$ssh2->auth_password('username','password')
  or die "Unable to login $! \n";

my $chan1 = $ssh2->channel();

$chan1->blocking(1);

$chan1->exec('echo $PATH');
$chan1->read($buf, $buflen);
print "BUF: ", $buf, "\n";

$chan1->close;

my $chan2 = $ssh2->channel();

$chan2->blocking(1);

$chan2->exec('echo $HOME');
$chan2->read($buf, $buflen);
print "BUF: ", $buf, "\n";

$chan2->close;
[download]

It outputs:

BUF: /usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin

BUF: /home/rob
[download]

If someone can provide me with a *nix script that both uses the shell() method and captures the output, then I'll take a look at replicating that on Windows.

Cheers,
Rob