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I'm actually working on this, although for various reasons I had to reimplement the formula parser (corner cases are a pain). Screenshot (in progress): http://i.imgur.com/snyBhYH.png

Just download VisiCalc: http://www.bricklin.com/history/vcexecutable.htm

I have no idea how easy it is to pipe input into and out of it, but it certainly want designed for it.

Fat-finger errors are already terrifying in spreadsheets. How would you help prevent them in command line tools?

Isn't that true for a lot of tools? Including programming languages?

GNU Oleo has a curses mode.

there is also "sc", "spreadsheet calc"

I would love a maintained {n,}curses mode spreadsheet that can handle excel1040.com.

R?