Firstly, drop that main() prototype - it doesn't do anything besides cluttering the code...

You don't need to list directories by redirecting output of system to a file and reading it - use glob. Here's what you can do:

use strict;
use warnings;
use File::Glob;

my @dirs;

chdir "C:/builds/Vnet/crm";
for (glob("*")) {push @dirs, $_ if -d;}
remove \1, $dirs[$_] for (0..$#dirs-5);
[download]

That's supposed to move to the vorking directory, get the list of the subdirectories, and delete everything but the last 5. Assuming you have them properly named, those last 5 directories are what you wanna see untouched.

 

Note: I never dealt with remove so I'm not sure if it works as you want it to... I tested it with print statement and it worked fine...