To add to what was already said, the only resources they take up are
entries in your process table, which generally you don't really care
about (but if you get messages like "No more processes", you've got a
problem). And if you didn't write the program that generated them (and
hence can't fix it to call wait()), then usually your zombie processes
will hang around until you reboot. They're annoying, but that's about
it.
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