Well then, maybe next time you ask a question, you will specify more details. How was I supposed to know you had one entry per line? I just assumed comma-separated because that's the closest assumption I could make out of the original posting. In any case, the code I provided will work for a one-item-per-line file anyway. But here's a refactored version of the whole thing: 

#!/usr/bin/perl -w

use strict;

chdir('dir1');

open(my $fh, '<', 'list.name') or die("open() failed: $!");

my %all = map { $_ => undef } grep { -d } glob("*");
delete($all{$_}) for ( map { chomp; $_ } <$fh> );

system('rm', '-ir', $_) for (keys(%all));

__END__
format of dir1/list.name:

dir1
dir2
dir3
dir4
dirx

[download]

In reply to Re^3: delete all directories which are not in list by saskaqueer
in thread delete all directories which are not in list by sachin_chat

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