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@ponies >I'm just saying the idea of somebody running code and editing it at the same time (despite your use case) is for the most part a fiction, it requires [...]

It is not fiction, and a very common (and known case) case. You have a semi-long running shell script, you run it, and then see something to improve -- edit, and boom. This can lead to real crap too, depending on how far bash has executed the file (not parsed!).

I'm not sure that @simontatham is a safe way of doing it though.