Hi all sed gurus (& wannabes like me),

Wanting to `sed` beyond my present understanding;

echo abcdefghijklmnopqrstuvwxyz | sed 'keep first 5 chars, then append a Z
to every fourth char thereafter, and keep the leftovers too'

ie

abcdefghiZjklmZnopqZrstuZvwxyZz

I think sed would be capable of this - but haven't proven it yet.

gc
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