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First time I hear of typo ... it's not on my standard Linux install ... where can I find the source code?

It’s not quite the original, but Rob Pike wrote an implementation in Go: https://github.com/robpike/typo

In go? This is a job for rust!

...there goes my weekend.

Typo was added in Research Unix V5[0] and also present in V6[1]. It isn't in V7, my guess is that it was replaced by spell. I don't think it would be difficult to get it compile on a modern system.

[0] https://github.com/dspinellis/unix-history-repo/blob/Researc...

[1] https://github.com/dspinellis/unix-history-repo/blob/Researc...

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