#!/usr/software/bin/perl -w
use strict;
use warnings;
use Net::SSH2;

my $ssh = Net::SSH2->new();
$ssh->debug(0);
my $bigcmd = "priv set diag; wafl_susp -w";
my @array;

$ssh->connect("10.61.92.10",22);
my $pass = 'P@ssw0rd';
$ssh->auth(username => 'root', password =>$pass );

if($ssh->auth_ok())
{
 runcmd(my_channel($ssh), "$bigcmd");
}

print "----------------------------------------------\n";
foreach (@array) {
  print "$_\n";
  }


sub runcmd
{
    my ($channel, $command) = @_;
    @array = <$channel>;
    $channel->exec($command);# or die $@ . $ssh->error();
    my $buff;
    while(!$channel->eof())
    {
        my $buff;
        $channel->read($buff, 1024);
    }
    my $rc = $channel->exit_status();
    $channel->close();
    return $rc;
}

sub my_channel
{
    my $ssh = shift(@_);
    my $chan = $ssh->channel('session');
    $chan->blocking ( 0 );
    $chan->flush();

    $chan->ext_data('merge');
    return $chan;
}
[download]

results in

 @cycsnane01:( ~/_Scripts/) $  ./waflsusp.pl
----------------------------------------------
[download]

You're reading from the channel before you execute the command through it. Look at my example again.

Aaron B.
Available for small or large Perl jobs; see my home node.