thanks! It's working fine now! I'll post the code I used, so you all can give me suggestion for improving my programming skills (I'm sorry if they're not good, but I've been using Perl for just a few week, for my Thesis, and it's all really new), or maybe it could be useful for someone with the same problem.. 

open my $testo, "<File_Input/Testo.txt";  
open my $conteggio, ">File_Output/Conteggio.txt";
my %arrayris;


    while (my $text=<$testo>){
     for my $key (keys %hash){
     my $value = $hash{$key};
     my $count = 0 ; 
     while ($text =~ /\b$key\b/ig) { $count++ ; } ;
     $arrayris{$key}=$count;


      
}
}

while ( my ($k,$v) = each %arrayris ) {
    print $conteggio "($k) => $v\n";
  
}
close $testo;
close $conteggio;

[download]

Thanks again, to everybody!

In reply to Re^4: Counting occurence of a list of word in a file by b_vulnerability
in thread Counting occurence of a list of word in a file by b_vulnerability

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