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Benefit is that it doesn't make you keep the terminal open.
There is 1 alternative - vote for the best!
you may as well use shutdown -h 18:32 to shutdown your machine at 18:32.
From the 'disown' man page:
disown prevents the current shell from sending a HUP signal to each of the given jobs when the current shell terminates a login session.
This way, you can specify how many hours in which you want your machine to shut down.
((60 * 4)) will be turned into 240 by bash before being input to the shutdown command, replace the 4 with whatever number of hours you want, let bash do the math.
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