You don't need to store all the lines to count them. You can just count them when reading them: 
my $count = 0;
$count++ while <FILE>;

[download]

In fact, Perl already does that. 

1 while <FILE>;
my $count = $.;

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^2: auto increment by choroba
in thread auto increment by PilotinControl

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