title: Need help understanding perl code
body: <p>I am a beginner in perl.
  Just wanted to understand the following code.</p>
  
  <pre><code>sub get_files {
      foreach my $customer (keys %customers){
          lg("Getting files from ftp for customer $customer", "LOG");
          my $ftp_server = $customers{$customer}{'FtpServer'};
          my $ftp_user   = $customers{$customer}{'FtpUser'};
          my $ftp_pass   = $customers{$customer}{'FtpPass'};
          my $datadir    = $datafiles.$customer."/";
  
  
          `$get_files $ftp_server $ftp_user $ftp_pass $datadir`;
  
      }
  }
  </code></pre>
  
  <p>What does last line in the above subroutine tells?</p>