Linux shutdown and restart command

Linux shutdown and restart command
Shutdown and restart command:
Shutdown [Option] Time
Option:
-C: cancel the previous shutdown command.
-H Shutdown
-R restart
Example:
Shutdown-r & (& indicates that the background is ready to be restarted at a specified time)
# Remote shutdown or restart
Shutdown-hnow shut down immediately
Other Shutdown (Insecure): (halt) (poweroff) (init 0)
Other restarts (reboot is relatively secure): (reboot) (init 6)
System running level (0 (shutdown)-6 (restart ))
1. Single User
2. Not all users, not including NSF services
3. Multiple users
4. unallocated
5. Start the graphic interface (the graphical interface is installed on the premise)
Runlevel
# Current level of the previous level
Log out:
Logout (it is best to execute logout remotely each time, otherwise it will affect the maximum number of connections)