a skeleton solution for your problem might be:

#!perl
use warnings;
use strict;

use File::Find;
my $startfolder = $ARGV[0] or die "no startfolder\n";
my @files;
find( \&macfind, $startfolder );
print "found: $_\n" for ( @files );

sub macfind {
  my $file = $File::Find::name;
  push( @files, $file ) if( ! -d $file && $file !~ /^Icon/ );
}


__END__

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