Still pretty weak on using hashes so I am hoping someone could please help. Im opening a file with domains in them and then pulling out only the root domain. Then I am trying to use the hash and grep to remove any duplicates but all I get back are blank lines. 

#!/usr/bin/perl 

$upload = "/var/tmp/work/upload"; 
$work = "/var/tmp/work/"; 
$input3 = "$upload/domain.csv"; 

system ("dos2unix $input3"); 

open (IN,"$input3"); 
open (OUT,">>$work/local.rules"); 
while (<IN>) { 
         chomp();

         if ($_ =~ /^.+\.([A-Za-z0-9-_]+\.[A-Za-z]{2,})$/){ 
                 $domain = $1; 
                 %seen = ();
                 @unique = grep { ! $seen{ $domain }++ } @array; 
                 print "@unique\n"; 
    }
}

[download]

In reply to remove duplicates with hash and grep by Smith

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.