You exhaust <> in your first pass. Unfortunately, you can't seek in tty STDIN, so you'll need to invert your logic, making all your comparisons in a single pass of <>. I don't think your range operators will take the same form in that rewrite.

If you mean to iterate over a seekable handle, you'll still probably be better off to only read once.

After Compline,
Zaxo

In reply to Re: Flip flop operator by Zaxo
in thread Flip flop operator by sashac88

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