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I don't quite understand the argument against bc in this case. 'echo "5 + 5" | bc' doesn't leave the command line.

bc is a little "obtuse". A bc replacement with BCD arithmetic and RPN entry would make me very happy :)

Actually, perhaps I should write one!

I think ``dc'' does what you want.

Wonderful! Thank you for posting. That's exactly what I wanted :)

Just a different way of approaching the problem