Unix: Simple command-line calculator

Simple command-line calculator
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(unix.stackexchange.com/users/90054/fabby)Fabby
(unix.stackexchange.com/users/86440/stephen-kitt)Stephen Kitt
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(unix.stackexchange.com/users/22565/st%c3%a9phane-chazelas)Stéphane Chazelas
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shell calculator