I'm going to simplify your input parsing as I think it's a bit confusing. But one way of appending output is:
#!/usr/bin/perl
use warnings;
use strict;
my $file = "outtest.txt";
open OUT, ">>", $file || die("Cannot open file for output.\n");
my @array;
while(<DATA>) {
s/tcp//g;
@array = split(/\s+/, $_);
print OUT "Address1=",$array[1],"\n";
print OUT "Address2=",$array[2],"\n";
print OUT "Address3=",$array[3],"\n";
}
__DATA__
tcp 20 tcp 40 tcp 80
And the output is:
<code>
C:\Code>perl outtest.pl
C:\Code>perl outtest.pl
C:\Code>type outtest.txt
Address1=20
Address2=40
Address3=80
Address1=20
Address2=40
Address3=80
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