Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/1230#issuecomment-47372033
I think it's unlikely that people are redefining exit() in the shell or
using "exit" as a variable name; but just for completeness, you can leave the
shell by typing `:quit`.
(btw, if `exit()` is an alias to `System.exit()` or something, maybe
registering a shutdown hook would suffice?)
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