If you are on a Linux or similar system where the modules are supported and you have FAM configured you could try something like:

#!/usr/bin/perl
 
use strict;
use warnings;
use File::Basename;
use SGI::FAM;
use Linux::Fuser;
use File::Spec;
 
my $fam  = SGI::FAM->new();
 
$fam->monitor('/home/jonathan/famtest');
 
my %filecache;
my $newdir = '/home/jonathan/famtemp';
 
my $fuser = Linux::Fuser->new();
while (1)
{
   my $event = $fam->next_event();
    
   my $basename = basename $event->filename();
 
   my $fullpath = File::Spec->catfile($fam->which($event),$basename);
   if ( $event->type() eq 'create' )
   {
      $filecache{$basename}++;
   }
   elsif ( $event->type() eq 'change' )
   {
     if ( exists  $filecache{$basename} and ! $fuser->fuser($fullpath)
+)
     {
        rename $fullpath,File::Spec->catfile($newdir,$basename)
                                  or warn "Couldn't move $fullpath - $
+!\n";
        delete $filecache{$basename};
     }
   }
   else
   {
            print "Pathname: ", $event->filename,
             " Event: ", $event->type, "\n";
   }
}
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/J\