Re: Use of uninitialized value $_ in pattern match (m//)

[toolic]

You should delete all elements of the array each time through the loop, not assign the value undef to the 1st element. Change:

        @net_configs = undef;

to:

        @net_configs = ();

Tip #4 from the Basic debugging checklist: Data::Dumper

[perlfan]

For that matter, initialize

my @net_configs = ();

[AnomalousMonk]

... initialize my @net_configs = ();

Why? What would  @net_configs look like if one were to depend on the default initialization of a newly-created lexical array?