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Linux system (boot (reboot instructs the system to reboot (shutdown -r (+0…
Linux system
boot
reboot
instructs the system to reboot
shutdown
-r
+0 (now)
now
+5 (in 5 min)
shutdown -r +5
System going down in 5 min
(wall for users)
-c cancel
systemctl reboot
init 6
poweroff
sends an ACPI signal which instructs the system to power down (immediate shutdown)
-h
-P
halt
instructs the hardware to stop all CPU functions.
shutdown -H
systemctl halt
init 0
targets
/usr/lib/systemd
units and units files