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I want to seperate all the duplicate records to a duplicate file and write out all the unique records to a unique file.

My input file is about 10MB and the records are sorted numerically. Here is the sample records:

and so on.

The dups file should look like:

The unique file should look like:

Here is my code:

open(IN,  $ifile);
open(UNQ, $ufile);
open(DUP, $dupfile);

my %seen;

while (<IN>) {

    if ( exists( $seen{$_} )) {
        print DUP "$_\n";
    }
    else {
        $seen{$_}++;
        print UNQ "$_\n";
    }
}
close(IN);
close(UNQ);
close(DUP);
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My code will not be able to pull ALL the duplicates to the dup file. Instead, it will keep the first duplicate record in unique file and write the rest of the duplicate records to the dup file.

Any suggestion?

edited: Fri Aug 8 13:37:06 2003 by jeffa - code tags, removed br tags, added readmore

In reply to Separate duplicate and unique records by wsee

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