for/foreach (<$fh>) is generally a bad idea - it implies slurping the file and creating a list of lines internally. Better is to use a while (<$fh>) loop. In both cases the loop body handles things a line at a time, but while is a better semantic match and is likely to be much more memory (and possibly slightly more time) efficient.

True laziness is hard work

In reply to Re^2: Need help with comparison code by GrandFather
in thread Need help with comparison code by sowais

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