Plenty of Unix shells support floating point. For example, the conveniently-named ksh93 was released in 1993, and was / is available on a wide range of systems. I’d guess the hipster-compliant fish shell can do these things too, but can’t be bothered to RTFM.

I think the takeaway is that floating point shell use cases are so vanishingly rare that no one bothers to switch shells over it.

https://unix.stackexchange.com/questions/40786/how-to-do-int...