In that case a simpler more direct approach might work for you 
#!perl 
use strict;

my $inpath  = "/AAA/BBB/CCC/IN";
my $outpath = "/AAA/BBB/CCC/OUT";

# check inpath files less than 60 mins 
# and more than 15 mins old
my $min_age = 0.25/24; # 15 mins in days
my $max_age = 1.00/24; # 1 hour in days

my $count =0;
my $ignore=0;
print "Scanning in dir $inpath .. \n";

opendir DIR, $inpath or die $!;
for (readdir DIR){
  # skip if not a file
  next unless (-f "$inpath/$_"); 
  
  # filter on age
  my $age = -M "$inpath/$_";
  if ( ($age > $min_age) 
    && ($age < $max_age) 
    && ( !/_ACK_/ ) ){
  
    # build outfile name
    (my $outfile = $_) =~ s/(\.xml)$/_ACK$1/;
    
    # check outfile exists
    if (-e "$outpath/$outfile"){
      print "$_ => $outfile exists\n";
    } else {
      print "$_ => $outfile does not exist\n";
    }
    
    ++$count;
  } else {
    ++$ignore;
  }
}    
closedir DIR;
print "$count files checked - $ignore files ignored\n";

[download]
poj

In reply to Re^7: ignore list of files using readdir function by poj
in thread ignore list of files using readdir function by kaka_2

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.