http://www.perlmonks.org?node_id=601341

spanko has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks, I'm a new Monk here - nice to meet you.

I have a great script here that is based on Net::Telnet - it telnets to a list of hosts, gathers the required info and dumps it into a local log file. Nice.

But....we are changing our network to using only SSH and therefore I need to adapt my "wonder script". I'm running ActivePerl 5.8.7 build 813 and have started off by creating a simple script using net-ssh-w32perl to run on a Windows XP SP2 platform.
I want to be able to run my SSH script against a list of servers, run a command on the remote server, and allow me to see / grab / log the output.
I have researched everywhere and see no clear answer. People recommend changing to Expect... I don't really want to do this.
Is it possible to grab the STDOUT when using the Net::SSH:W32Perl module?
I suspect there is an issue with stdout for the following reason.

(1) I can run the following code without any problem: => as long as any stdout gets redirected (... > /tmp/foo.out...)

================================================ my($host, $username, $new_password, $old_password); $host = 'xxx.xxx.xx.xxx' $username = 'blah'; $password = 'secret'; use strict; use Net::SSH::W32Perl; ## Create a Net::SSH::Perl object and login to the remote host. my %args; $args{debug} = 1; $args{protocol} = 2; my $ssh = new Net::SSH::W32Perl($host, %args); $ssh->login($username, $password); my ($stdout, $stderr, $exit) = $ssh->cmd('ls > /tmp/foo.out',"\n"); =========================================================

(2) As soon as I change the last line to this (without the redirect), it hangs:

my ($stdout, $stderr, $exit) = $ssh->cmd('ls',"\n");

(3) This is the output I receive:

Reading configuration data C:\Documents and Settings\myname/.ssh/con Reading configuration data /etc/ssh_config Connecting to 9.0.6.141, port 22. Socket created, turning on blocking... Remote protocol version 2.0, remote software version OpenSSH_3.4p1 Net::SSH::Perl Version 1.27, protocol version 2.0. No compat match: OpenSSH_3.4p1. Connection established. Sent key-exchange init (KEXINIT), wait response. Algorithms, c->s: 3des-cbc hmac-sha1 none Algorithms, s->c: 3des-cbc hmac-sha1 none Entering Diffie-Hellman Group 1 key exchange. Sent DH public key, waiting for reply. Received host key, type 'ssh-dss'. Host 'x.xx.xxx.xxx' is known and matches the host key. Computing shared secret key. Verifying server signature. Waiting for NEWKEYS message. Enabling incoming encryption/MAC/compression. Send NEWKEYS, enable outgoing encryption/MAC/compression. Sending request for user-authentication service. Service accepted: ssh-userauth. Trying empty user-authentication request. Authentication methods that can continue: publickey,password. Next method to try is publickey. Trying pubkey authentication with key file 'C:\Documents and Settings Login completed, opening dummy shell channel. channel 0: new [client-session] Requesting channel_open for channel 0. channel 0: open confirm rwindow 0 rmax 32768 Got channel open confirmation, requesting shell. Requesting service shell on channel 0. channel 1: new [client-session] Requesting channel_open for channel 1. Entering interactive session. Sending command: ls Requesting service exec on channel 1. channel 1: send eof channel 1: open confirm rwindow 131071 rmax 32768 =======> Hangs Here.

When it runs OK (with the stdout redirect) I get this:

Sending command: ls Requesting service exec on channel 1. channel 1: send eof channel 1: open confirm rwindow 131071 rmax 32768 channel 1: rcvd eof channel 1: output open -> drain channel 1: obuf empty channel 1: output drain -> closed channel 1: close_write channel 1: send close input_channel_request: rtype exit-status reply 0 channel 1: rcvd close channel 1: full closed =======> script exits normally
Does anyone have any ideas on how I can grab the command output to a file no my local machine? Currently I am thinking I will have to run the script in its current format, outputting a bunch of commands to a file on the remote server, and then FTP the file back to my machine once completed.
Thanks