So 
my @array = <$fh>;
for (my $i=0; $i<@array; ++$i) {
   my $line = $array[$i];
   ...
   if (...) {
      defined( my $next_line = $array[++$i] )
         or die;
      ...
   }
   ...
}

[download]

It's simpler just doing 

while (my $line = <$fh>) {
   ...
   if (...) {
      defined( my $next_line = <$fh> )
         or die;
      ...
   }
   ...
}

[download]

In reply to Re^4: advancing in file read by ikegami
in thread advancing in file read by cammac

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