At the end of run, `exec` should be used to switch to the node process. That way node will take over the pid of `sh run.sh`, making it easier to monitor and daemonize the server.
```
exec [command [arg ...]]
Unless command is omitted, the shell process is replaced with the
specified program (which must be a real program, not a shell
built-in command or function). Any redirections on the exec com-
mand are marked as permanent, so that they are not undone when
the exec command finishes.
```
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