read PROCESSING-A-FILE-UPLOAD and section Accessing the temp files directly.

If you use open to create the newfile there is no renaming required.

#!/usr/bin/perl
use strict;
use warnings;
use CGI;
use File::Copy;
use CGI::Carp 'fatalsToBrowser';

my $q     = CGI->new;
my $photo = $q->param("pic");
my $result;

if ($photo){
  my ($ext) = $photo =~ /([^.]+)$/;
  my $copydir = '/full/path/to/web/img/';
  my $newfile = $copydir."011190.$ext";

  my $upload_fh = $q->upload("pic");
  
  open OUTFILE,'>',$newfile or die "$!";
  binmode OUTFILE;
  while (<$upload_fh>){ # $upload_fh as filehandle
    print OUTFILE;
  }
  close OUTFILE;
  $result = "$photo written to $newfile";
  
  # Alternative using copy

  #my $tmpfile = $q->tmpFileName($upload_fh);
  #if ( copy($tmpfile,$newfile) ){
  #  $result = "File $photo uploaded to $newfile.
  #  Temp file : $tmpfile";
  #} else {
  #  $result = "ERROR copying $tmpfile to $newfile";
  #}
}

print $q->header(),$q->start_html("Upload Test");
print << "HTM";
<h2>File upload</h2>
<div style="background-color:yellow">$result</div><br/>
<form method="post" action="" enctype="multipart/form-data">
Filename: <input type="file" name="pic"/><br/><br/>
<input type="submit"/>
</form>
HTM
print $q->end_html;
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