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How to schedule system reboot

Andy

Andy

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It is a short entry, but a useful one, as it is important to have a basic knowledge of how to schedule a system reboot or power it down automatically at the specified time.

Schedule operation
Reboot system now.
Bash: 
$ sudo shutdown -r now

Shutdown system now.
Bash: 
$ sudo shutdown -P now

Reboot system at 14:30.
Bash: 
$ sudo shutdown -r 14:30

Shutdown system after 80 minutes.
Bash: 
$ shutdown -P +80

Cancel a pending operation.
Bash: 
$ shutdown -c

Verify pending operation on Debian Jessie (systemd 215).
Bash: 
$ cat /run/systemd/shutdown/scheduled

Code: 
USEC=1445770800000000
WARN_WALL=1
MODE=poweroff

Verify operation
Verify pending operation on Ubuntu Wily Werewolf using D-Bus.
Bash: 
$ qdbus --literal --system org.freedesktop.login1 /org/freedesktop/login1 org.freedesktop.DBus.Properties.Get org.freedesktop.login1.Manager ScheduledShutdown
Code: 
[Variant: [Argument: (st) "poweroff", 1445770800000000]]

Note that this timestamp is in microseconds (1/1000000 second).
Click to expand...
Use date and bc command to pretty-print the scheduled date.
Bash: 
$ date -d @$(echo "(1445770800000000/1000000)" | bc)
Sun Oct 25 12:00:00 CET 2015

This operation can be divided into two steps:
Bash: 
$ echo "(1445770800000000/1000000)" | bc
1445770800
Bash: 
$ date -d @1445770800
Sun Oct 25 12:00:00 CET 2015

Please verify that you can rely on /run/systemd/shutdown/scheduled file as it is not deleted after the whole operation is aborted using Ubuntu 15.10 and systemd 225.
 
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