Hello Peter Keystrokes,

As the fellow monk choroba has provided you an answer to your question already, I wanted to answer the last part of your question (How then do I capture all the files with the extension of my choice so that I can then open those files to extract data? ).

Take a look for the module File::Find::Rule. Why I propose this? Simple, multiple directories and also Directory Recursion.

Sample of solution (for testing purposes I used .txt extension you can use .csv).

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
use File::Find::Rule;

my @dirs = @ARGV ? @ARGV : ('.');
my $level = shift // 2;

my @files = File::Find::Rule->file()
    ->name('*.txt')
    ->maxdepth($level)
    ->in(@dirs);

print Dumper(\@files);

__END__

$ perl main.pl
$VAR1 = [
          'test.txt',
          'counts.txt',
          'SubFolder/foo.txt'
        ];
[download]

Update: I updated the output to an array as the user wants an array output.