Hej, You probably didn't see this (marked with ####) 
open(my $fh, "<", $ARGV[0]) or die "cannot open input file: $!";
my @words = <$fh>;
close $fh or die "cannot close input file: $!"; ##############
my $words = @words;

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On the other hand, I don't understand the last line - you read a file into array with my @words = <$fh>; and then you assign it to a scalar variablemy $words = @words;.

OK, you probably have your own reasons for that but you could manipulate array as good as scalar. And you could read a file directly in a scalar variable. my $words = <$fh>;

In reply to Re^6: Looking for pointers or optimizations. by SerZKO
in thread Looking for pointers or optimizations. by thmsdrew

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