troff.

I suppose, in a sense, that 'dc' also fits the bill but given that that is inherent in it's stack based nature, I doubt that is what you meant.

On Thu, Oct 22, 2015 at 8:20 AM, Doug McIlroy <doug@cs.dartmouth.edu> wrote:

Quiz for the occasion: which major Unix utility adopted IPL's
unprecedented expression syntax?

doug
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