Well - I just ran your code here (on linux), adding "use strict", and adding "my" as appropriate, and it ran correctly (or at least I don't have any empty lines anywhere).

Ah - I know what the problem is:

foreach $network_if (@tcp_utilization_metrics) {
    local $if_name = $network_if;
    if ($network_if =~ /en/) {
        $network_if =~ substr ($network_if, 2, 0, "t");
    }
[download]

If you reverse things you should be fine:

foreach $if_name (@tcp_utilization_metrics) {
    local $network_if = $if_name;
    if ($network_if =~ /en/) {
        $network_if =~ substr ($network_if, 2, 0, "t");
    }
[download]

Michael

Wow...that's exactly the problem. I added a Dump after the second foreach loop, and came up with this:

$VAR1 = {
          'en0' => 'ent0',
          'en1' => 'ent1' 
        };
$VAR1 = (
          'ent0',         
          'ent1'          
        );

Thanks so much! That's a heck of a caveat...err...feature to have.

P.S. The following is the docs on the foreach loop that are in my Camel (Ver. 1):

The foreachloop iterates over a list value and sets the control variable (var) to be each element of the list in turn...

I guess that implicitly states what you said, but it's not extremely obvious...