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Shell programming

Unlike sed, the shell is a real programming language

A few years back Zach Holman wrote a cute little shell script called spark

           % spark 1 2 3 4 7 5 3 1                # https://github.com/holman/spark

           ▂▃▄▅█▆▄▂

Embed it in your prompt or whatever

But its arithmetic was totally broken

It didn't always make the bars the right height

Problem: You need to do fraction arithmetic

The shell doesn't have any

expr uses only integers