in reply to Array Normalization of File::DirWalk

Since you are printing the directories on the way out you should be able to just do the following:
use strict; use warnings; use File::DirWalk; my $folder = 'E:\test\foldersize\1-folder|E:\test\foldersize\2-folder| +E:\te +st\foldersize\5-folder'; my $depth = 3; my @directory = grep!/^\s*$/, split/\|/, $folder; my @folder; my %dirs; for my $directory (@directory){ my $dw = new File::DirWalk; $dw->onDirLeave( sub { my ($dir) = @_; if ( !exists $dirs{$dir} ) { if( $dir =~ /(.*)\\/ ) { undef($dirs{$1}); } push (@folder, $dir); } return File::DirWalk::SUCCESS; } ); $dw->setDepth($depth); $dw->walk($directory); } print $_,$/ for @folder
and hence it won't print any directory that has any directories in it.