Shorter, yes, but it looks like you've re-introduced the "input-file is small enough to be read into memory" constraint. Or have I missed something?
Hm, good point, I guess in my excitement over the nice short oneliner I sort of did. -000* turns on paragraph mode, so if the file contains lots of short "paragraphs" with blank lines in between, it'll be fine, but if the file contains, say, a block of several MB of non-blank lines, a single blank line, and another huge paragraph, then yes, you're right, my solution isn't that great.
* perlrun is a little unclear whether it's -00 or -000, both seem to work.
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