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shutdown pc in a 4 hours

Terminal - shutdown pc in a 4 hours
shutdown -h +240
2011-05-02 18:38:57
User: joedhon
Functions: shutdown
5
shutdown pc in a 4 hours

you may as well use shutdown -h 18:32 to shutdown your machine at 18:32.

Alternatives

There are 2 alternatives - vote for the best!

Terminal - Alternatives
shutdown -h 240 & disown
2011-05-02 18:22:09
User: adelie42
Functions: shutdown
4

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.

shutdown 60*4 & disown
2011-05-09 02:44:55
User: benjabean1
Functions: shutdown
Tags: bash
1

This way, you can specify how many hours in which you want your machine to shut down.

shutdown -h $((60 * 4))
2011-05-02 07:10:10
User: retrodanny
Functions: shutdown
0
((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.
echo "shutdown -h now" | sudo at now + 4 hours
2011-05-02 15:29:48
User: depesz
Functions: at echo sudo
-2

Benefit is that it doesn't make you keep the terminal open.

sleep 4h && halt

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