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  1. or download this
    opendir (DIR, $dir) or die "cannot opendir $dir";
foreach my $file (readdir(DIR)) {
    &process_file ($file);
}
closedir (DIR);
  2. or download this
    my @only_files = grep {-f "$dir/$_"} readdir(DIR);
foreach my $file (@only_files) {
    &process_file ($file);
}
  3. or download this
    map {&process_file} grep {-f "$dir/$_"} readdir(DIR);