I suggest that you create a hash to store the number of times you have seen something. Then, you can iterate over the hash to create the output.

Updated: So, I was a little behind on this and basically solved it the same way as other monks. Oops. That's what happens when your boss walks in while you are playing around on PM. :)

use strict;

open (IN, "test.txt")   or die "Can't open file: $!";
open (UNQ, "> unq.txt") or die "Can't open file: $!";
open (DUP, "> dup.txt") or die "Can't open file: $!";

my %hash;

while (<IN>) { chomp; $hash{$_}++; }

foreach (keys %hash) {
  if ( $hash{$_} > 1) { print DUP "$_\n"; }
  else { print UNQ "$_\n"; }
}

__END__

fraser:~$cat test.txt
0000
1111
2222
3333
4444
0000
3333
1111
5555
1111
0000
0000
1111
3333
6666
0000
fraser:~$cat unq.txt
6666
4444
2222
5555
fraser:~$cat dup.txt
0000
3333
1111
fraser:~$

[download]

</ajdelore>

In reply to Re: Separate duplicate and unique records by ajdelore
in thread Separate duplicate and unique records by wsee

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.