But I wanted to mention my first impression when I saw that code in jmcnamara's node: "Oh, that takes way too much memory and will fail for files that don't fit within your available swap space".
I hope you realise that I was aware of that. :-)
This snippet's only real value is as a mild curiosity. When I first posted it here I wrote: "There are many ways of doing this and most of them are better".
If I really wanted a line count I would use one of the following in this order of preference:
wc -l file
awk 'END{print NR}' file
perl -nle 'END{print $.}' file
--
John.
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