Hi, You could use the more powerful, more user-friendly Path::Iterator::Rule for iterating through directory trees and Path::Tiny for file handling. Note that you can pass an anonymous subroutine as the value of the visitor option to the iterator call, to handle the matching files as they are found.

In the following demonstration we want to move into B/ any files with .txt extension and no contents, found in any subdirectory of A/, then delete the subdirectory if empty. (You can of course use more meaningful conditions, e.g. test for file size, or age, or even matching contents. See the doc. Also see SEE ALSO in the doc for a discussion of the various tools that can be used for this task.)

use strict; use warnings; use feature 'say';

use Path::Iterator::Rule;
use Path::Tiny;

my $root = './1204707';
my $in   = $root . '/A'; 
my $to   = $root . '/B';

my $rule = Path::Iterator::Rule->new;
$rule->file->name( qr/txt$/ );
$rule->file->empty;

my $next = $rule->iter( $in, {
    depthfirst => 1,
    visitor => sub {
        my $path = path( shift );
        my $parent = $path->parent;
        $path->move( $to . '/' . $path->basename );
        rmdir $parent if not $parent->children;
    },
});

while ( defined( my $file = $next->() ) ) {
    say "processing $file";
}

__END__
[download]

First set up the test files. We expect after running the program that there will be five empty text files in B/, and that A/bb (and subdir) will have been removed.

$ ls -goR 1204707

# File size here
#            |
#            V

1204707:
total 8
drwxrwxr-x 5 4096 Dec  2 08:56 A
drwxrwxr-x 2 4096 Dec  2 08:56 B

1204707/A:
total 12
drwxrwxr-x 2 4096 Dec  2 08:56 aa
drwxrwxr-x 3 4096 Dec  2 08:56 bb
drwxrwxr-x 2 4096 Dec  2 08:56 cc

1204707/A/aa:
total 20
-rw-rw-r-- 1 8 Dec  2 08:56 file1.txt
-rw-rw-r-- 1 0 Dec  2 08:56 file2.txt

1204707/A/bb:
total 20
drwxrwxr-x 2 4096 Dec  2 08:56 aaa
-rw-rw-r-- 1    0 Dec  2 08:56 file3.txt
-rw-rw-r-- 1    0 Dec  2 08:56 file4.txt

1204707/A/bb/aaa:
total 8
-rw-rw-r-- 1 0 Dec  2 08:56 file7.txt

1204707/A/cc:
total 20
-rw-rw-r-- 1 0 Dec  2 08:56 file5.txt
-rw-rw-r-- 1 8 Dec  2 08:56 file6.dat

1204707/B:
total 0
[download]

Run the program:

$ perl 1204707.pl

processing ./1204707/A/aa/file2.txt
processing ./1204707/A/bb/aaa/file7.txt
processing ./1204707/A/bb/file3.txt
processing ./1204707/A/bb/file4.txt
processing ./1204707/A/cc/file5.txt
[download]

Check the directory tree after running the program:

ls -goR 1204707
1204707:
total 8
drwxrwxr-x 4 4096 Dec  2 08:57 A
drwxrwxr-x 2 4096 Dec  2 08:57 B

1204707/A:
total 8
drwxrwxr-x 2 4096 Dec  2 08:57 aa
drwxrwxr-x 2 4096 Dec  2 08:57 cc

1204707/A/aa:
total 12
-rw-rw-r-- 1 8 Dec  2 08:56 file1.txt

1204707/A/cc:
total 12
-rw-rw-r-- 1 8 Dec  2 08:56 file6.dat

1204707/B:
total 40
-rw-rw-r-- 1 0 Dec  2 08:56 file2.txt
-rw-rw-r-- 1 0 Dec  2 08:56 file3.txt
-rw-rw-r-- 1 0 Dec  2 08:56 file4.txt
-rw-rw-r-- 1 0 Dec  2 08:56 file5.txt
-rw-rw-r-- 1 0 Dec  2 08:56 file7.txt
[download]

Hope this helps!