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lang-bash
$(( .. ))itself is POSIX, so it's likely to be supported in any sensiblesh. Exponention with**isn't standard, though, and e.g. Dash indeed doesn't support it.$(( 3.1416 ** 0.5 ))(it also does**, and logical^^; I think that's it for missing features from bash, but I do have to say, not being able to do floating point math hurts.)$(( ... ))not being available in a POSIX sh isn't one.