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#!/usr/bin/perl
BEGIN {
    $|=1;

    use CGI::Carp('fatalsToBrowser');
}

use CGI;
use LWP::Simple;

use strict;
use warnings;

$q= new CGI;
$my_data=$q->param('set');
$lower=1000; 
...
$random = int(rand( $upper-$lower+1 ) ) + $lower; 
$filename="file$random.jpg";
getstore($my_data,"../temp/$filename");