Scheduling / descheduling linux host reboots via shutdown

Scheduling and/or descheduling linux host reboots is possible with the shutdown -r command using the time parameter (the reboot command, that I usually prefer in favour of clarity, does’nt feature the time parameter, so shutdown -r is the only choice here). Aside from discussing the quite straightforward man page of shutdown, there is two points here to register in your knowledge cells.
First, a (scheduled) shutdown -r hh24:mi execution will hangup itself into background, no need to use job-tools or an &. shutdown -r hh24:mi actually puts systemd-shutdownd in charge of serving the party, this is what you”ll want to expect to see in your running process list, looking for some command effect. Also, a running scheduled shutdown may be cancelled using shutdown -c any time before hh24:mi. Note however, that from around five minutes before hh24:mi, you’ll you’ll no longer be allowed to login the machine, essentially impeding any further control from your side.