I have tried it both ways and I am getting a message about "use of uninitialized value in concat......"

sub getPlatformFiles {
#    my ($plat_in, $nic_in) = @_;
    my $plat_in = shift;
    my $nic_in = shift;
    my @list;
    print "<$plat_in>\n";    #debugging
    print "<$nic_in>\n";    #debugging
    if ($plat_in =~ /RedHat/) {
        @list = ("/etc-test/resolv.conf", 
                  "/etc-test/sysconfig/network-scripts/ifcfg-$nic->{de
+vice}");
    }
    return @list;
}
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The first debugging has the correct value but the second is blank empty. It prints <>