Hello YehorM,

Welcome to the Monastery. I would like to add a minor suggestion that might be your case that you are having.

As fellow Monk karlgoethebier you have a script named test.pl sample of code:

#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';

say "Hello World";
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I assume that you are executing the script like this: perl test.pl in the same directory as you script.

I am not sure if you know what I mean, so here is an example to find in linuxOS, if you are running the script in the correct path/directory. Sample of code:

$ ls -la | grep test.pl
-rw-r--r--  1 user user   118 Nov 27 14:47 test.pl
-rw-r--r--  1 user user   475 Nov 22 12:37 test.pl~
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I can only imagine that you are getting an error code like:

$ perl thanos.pl
Can't open perl script "thanos.pl": No such file or directory
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This error occurs because in the directory that I am currently there is no script named thanos.pl so Perl can not execute anything.

P.S. Why you installed UbuntuOS on a virtual machine, is it only to be able to run Perl scripts? If this is the case you can execute Perl scripts in WindowsOS also, see here Perl Download for more information. Also read this article dedicated to BioPerl on how to install it. I think this is where you should be focusing.

Hope this helps, BR.