shutdown - Turn off computer every day at same time

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

Primitatvve