EXTRACT_FIRST_COLUMN(my $TEMPCSV = 'C:\temp\part1.csv', my $TEMPTXT = 'TEMP_AM.txt', my $FINALCSV = 'C:\temp\OUT.CSV');
EXTRACT_FIRST_COLUMN(my $TEMPCSV = 'C:\temp\part2.csv', my $TEMPTXT = 'TEMP_CA.txt', my $FINALCSV = 'C:\temp\OUT2.CSV');

sub EXTRACT_FIRST_COLUMN {
my $csv = Text::CSV->new();
open (FILE,">","$TEMPTXT");
open (CSV, "<", $TEMPCSV);
while (CSV>) {
if $csv->parse($_)) {
my @column = $csv-> fields();
print FILE "$column[0]\n";
} else {
my #err = $csv->error_input;
print "ERROR: Failed to parse line: $err";
}
}
close (FILE);

open (OUTPUT2,">","$FINALCSV);
my $file = $TEMPTXT;
open (my $FH, "<", $file) or die $!;
while <$fh>) {
my $uri = $_;
$uri =~ s/\s+//g;
my ($name, $aliases, $addrtype, $length, @addrs) = gethostbyname $uri;
my ($w,$x,$y,$z) = unpack('C4',$addr[0]);
print OUTPUT2 "$w.$x.$y.$z\n";
}
close (OUTPUT2);
}
sub EXTRACT_FIRST_COLUMN();