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Is there any easy way to get all the output of a process? Ideally, the
function takes parameters like exec(), calls fork(), wait()s for the
process to complete, and returns the process's stdout, stderr, and exit
status. By stdout and stderr I don't mean file objects or
descriptors... I mean strings containing the entire output.

I would try to do it myself, but I'm not sure how to interleave the
operations.