Thanks for that. I considered saying that the first version used memory proportional to twice the file size, but I wasn't sure. In any case it is transient and, as you say, for small files it doesn't matter.

DWIM is Perl's answer to Gödel

In reply to Re^5: What is the right way of concatenating strings by GrandFather
in thread What is the right way of concatenating strings by cool

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