shutdown - Turn off computer every day at same time - Ask Ubuntu


i want computer turned off every day @ 21:30. how do this?

i found command: 

sudo shutdown -h 21:30

is correct?

with have have terminal open time. read can run in background don't have have terminal open time. how do this?

if don´t have run in background, else have do?

you can use this;

open cron file;

sudo -h gedit /etc/crontab

add below end of line 

30 21 * * * root shutdown -h

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