Dan, I wrote: Quiz for the occasion: which major Unix utility adopted IPL's unprecedented expression syntax? You correctly responded: 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. The notion of precedence pertains specifically to infix notation, so postfix dc is definitely not in the running. Idle thought about my typo: Though APL is famously inscrutable, IPL (specifically IPL-V) outshined it in that department. Doug