The problem with kill -0 is that its semantics are "could I send a signal to this process?" - i.e. it will fail if the process exists but is not owned by the current user. I think this is not quite what we're looking for, so let's use ps -p. I've tested that ps -p does the right thing on Linux and OS X, and it claims to work on FreeBSD and AIX too according to the manpages on the web. That's probably good enough.

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