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Full Discussion: How to shutdown Linux box with user confirmation?
Top Forums UNIX for Dummies Questions & Answers How to shutdown Linux box with user confirmation? Post 302896637 by hicksd8 on Tuesday 8th of April 2014 11:52:59 AM
Old 04-08-2014
When Corona688 says that the 'reboot' command is not interactive I think he means that it doesn't ask for confirmation. If you are root then that command (on most Unix flavors) will reboot the system (instantly) so prone to mistakes.

The 'shutdown' command is the standard way of doing it because you can specify a delay, send a warning to all logged-in users that the system is going down, etc. During the warning period the sequence could be interrupted if it was issued in error.

Another command you should be aware of is 'init' which changes the 'run level'.

Code:
 
 init 0

will close down the system

Code:
init 6

will reboot the system

Code:
init 5

will close down the system and power it off if your PSU supports it.

There are other 'run levels'; see the man page.

Most of the above relates to generic Unix speak. Depending on which flavour you're running, in my experience, 'init <run level>' is more likely to give you an orderly shutdown/reboot than the 'reboot' command.

'init' is the sysadmins short cut and NOT to be used by anyone else.
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LEARN ABOUT HPUX

systemd-halt.service

SYSTEMD-HALT.SERVICE(8) 				       systemd-halt.service					   SYSTEMD-HALT.SERVICE(8)

NAME

       systemd-halt.service, systemd-poweroff.service, systemd-reboot.service, systemd-kexec.service, systemd-shutdown - System shutdown logic

SYNOPSIS

       systemd-halt.service

       systemd-poweroff.service

       systemd-reboot.service

       systemd-kexec.service

       /lib/systemd/systemd-shutdown

       /lib/systemd/system-shutdown/

DESCRIPTION

       systemd-halt.service is a system service that is pulled in by halt.target and is responsible for the actual system halt. Similarly,
       systemd-poweroff.service is pulled in by poweroff.target, systemd-reboot.service by reboot.target and systemd-kexec.service by kexec.target
       to execute the respective actions.

       When these services are run, they ensure that PID 1 is replaced by the /lib/systemd/systemd-shutdown tool which is then responsible for the
       actual shutdown. Before shutting down, this binary will try to unmount all remaining file systems, disable all remaining swap devices,
       detach all remaining storage devices and kill all remaining processes.

       It is necessary to have this code in a separate binary because otherwise rebooting after an upgrade might be broken -- the running PID 1
       could still depend on libraries which are not available any more, thus keeping the file system busy, which then cannot be re-mounted
       read-only.

       Immediately before executing the actual system halt/poweroff/reboot/kexec systemd-shutdown will run all executables in
       /lib/systemd/system-shutdown/ and pass one arguments to them: either "halt", "poweroff", "reboot" or "kexec", depending on the chosen
       action. All executables in this directory are executed in parallel, and execution of the action is not continued before all executables
       finished.

       Note that systemd-halt.service (and the related units) should never be executed directly. Instead, trigger system shutdown with a command
       such as "systemctl halt" or suchlike.

SEE ALSO

       systemd(1), systemctl(1), systemd.special(7), reboot(2), systemd-suspend.service(8)

systemd 237														   SYSTEMD-HALT.SERVICE(8)
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