First of all, thanks for posting your code. It's good to see you're trying (and trying to learn). And good on you for use-ing strict and warnings.

So, I'm back asking your help.

Not a problem - "everyone is a newbie at something".

I hope I don't make too many mistakes posting this.

I guess you're referring to Re: Perl starter with big problem.. Don't take that personally; it's a criticism of your post title, not you as a person. Do take the criticism on board (i.e. learn from it) - parv had a good reason for saying it: namely, the Monastery is full of very skilled people with many demands on their time. If you make a post, the only way they can judge whether the post aligns with their interest and expertise is by the title. A vague title gives them nothing to go on - every other post in Seekers of Perl Wisdom is by a "Perl starter with a big problem". A better title would have been How can I replace TAB chars with '/'.

(Another reason for not using vague titles is that it makes it hard for others to search the Monastery for solutions to the same problem you were having.)

It's still hard to figure out exactly what you're after. Can you please post (some of) the contents of the file 'Output' after the script runs, and tell us what's wrong with it?

Also, a few random points about your code:

• You can safely use my $i where you used $indice and then re-use $i (without the my) where you used $indice_controllo) - $i is easier to type and just as clear
• On line 13 you say my ($k,$v) = each %hash but then on lines 23 and 24 you say for my $key (keys %hash) ... my $value = $hash{$key}. You had it better the first time :)
• Should probably check the return codes of your last two opens as well

HTH,
mtp