Assuming I'm looking at the right lines, you're contemplating the difference between:

    #print $channel "$cmd\n";
    #while (<$channel>) {
    print {${$channel}} "$cmd\n";
    while (<${$channel}>) {
[download]

That's because you're having a problem with passing references to filehandles. $channel is a filehandle. You're passing it by reference:

$self->{_ssh2_channel} = \$channel;

Which means when you're trying to use it - as a filehandle - you need to dereference first. Consider if you will:

#!/usr/bin/perl

use strict;
use warnings;

sub print_to_fh
{
  my ( $ref_to_fh ) = @_;
  #$ref_to_fh is _not_ a filehandle. It's a scalar, that's a reference
+. 
  print $ref_to_fh "Some text\n";
}

open ( my $filehandle, ">", "testfile.txt" );
&print_to_fh ( \$filehandle );
close ( $filehandle );
[download]

This will give you the same error - because what you're passing _into_ the subroutine is not a filehandle, it's a reference to a filehandle.

sub print_to_fh
{
  my ( $ref_to_fh ) = @_;
  #$ref_to_fh is _not_ a filehandle. It's a scalar, that's a reference
+.  
  my $filehandle = $$ref_to_fh;
  #Filehandle has dereferenced $ref_to_fh, so we can print to it now:
  print $filehandle "Some more text\n";
}

open ( my $filehandle, ">", "testfile.txt" );
&print_to_fh ( \$filehandle );
close ( $filehandle );
[download]

This works, because the filehandle has dereferenced. I think this is what is happening in your code - a filehandle is basically a reference to a file, and you are passing a reference _to_ that reference.

Edit: Check 'perldoc -f print': If you're storing handles in an array or hash, or in general whenever you're using any expression more complex than a bareword handle or a plain, unsubscripted scalar variable to retrieve it, you will have to use a block returning the filehandle value instead...

Therefore in the example above, you could instead do:

  print {$$ref_to_fh} "Even more stuff\n";
[download]

That's the essence of what that 'not a GLOB' message means - print doesn't like (recognise) your filehandle

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