& vs nohup

[M.W. Chang]

> some processes (and this is also shell dependent), will exit when the
> controlling tty exits.  The nohup command allows you to exit by acting
> as the controlling tty (although if the process requires input it will
> hang until you kill it).

It seems that btdownloadheadless.py isn't supposed to be sent to 
background. It would cease working.

-- 
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