Julia’s Cmd is awesome. It’s very exciting that you are planning to turn it into a mini shell DSL. I also think that subprocess API can be improved further by stealing some high-level APIs from Python subprocess because some of them are actually nice. For example, sending data to subprocess stdin and reading stdout at the same time without a deadlock is somewhat non-trivial in Julia at the moment while Python has Popen.communicate exactly for that. Also, relatively new Python has subprocess.run which makes it possible to do this in one line.
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