[issue3548] subprocess.pipe function

[R. David Murray]

R. David Murray added the comment:

Exactly like the string pipes API, but cmd would be a list of arguments instead of a string.  That would then become the argument list to the subprocess stage.

It is an interesting question whether we'd want to allow mixing stage types.  I'd say no (at least initially, if people complain we can add it as a feature later, but we can't subtract it if we implement it now and decide it is a bad idea after putting it in the field).

Now, keep in mind that you've only got my opinion so far that this is even a good idea :)

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