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Shutdown

Powering off safely

QuestionAnswer
Shut the system down IMMEDIATELY shutdown - h now - halt - init 0
Shut the system down immediately and REBOOT shutdown - r now - reboot - init 6
Shut the system down in a designated amount of time and send a message shutdown -h {time message}
Example: Shut the system down in 10 minutes and send a message "The system is going down in 10 minutes" shutdown -h +10 The system is going down in 10 minutes
Shut the system down and REBOOTin a designated amount of time and send a message shutdown -r {time Message}
Example: Shut the system down and REBOOT in 15 minutes and send a message "The system is rebooting in 15 minutes" shutdown -r +15 The system is rebooting in 15 minutes
Reboot the system at midnight and send a message "System reboots at midnight" shutdown -r 24:00 System reboots at midnight
shut the system down at 10:00 PM shutdown -h 22:00
Terminate the shutdown process shutdown -c - Ctrl+c
Reboot the system and skip the fsck utility on reboot shutdown -rf
shutdown parameter that stands for FAST REBOOT -f
Send a warning message, but does not actually shut down shutdown -k
Example: Send the message "Please log out of the system" but do not actually shut the system down shutdown -k Please log out of the system
Example: Send the message "Please log out of the system" but do not actually shut the system down - terminate the message after message is sent shutdown -hk Please log out of the system
Use the ---- file to shut down the system /etc/shutdown.allow
The most common use of the shutdown -a switch is to edit this file /etc/inittab Add the -a switch to the CTRL-ALT-DELETE section
When the -a switch is present in the /etc/inittab file, shutdown reads the: /etc/shutdown.allow file
If a listed user or root is logged into the system The system shuts down
If a listed user or root is NOT logged into the system Shutdown is not allowed
There are no shutdown restrictions if this file does not exist /etc/shutdown.allow
When using the shutdown command to shut down a computer, the system does the following: 1. Sends a SIGTERM message to running programs to allow them to close - 2. Notifies logged on users that the shutdown process has started and the length of time before shut down
When using the shutdown command to shut down a computer, the system does the following: 3. Blocks users from logging into the system - 4. Uses init and /etc/inittab to shut down processes and the system
Command will reread the entries in /etc/inittab and make the settings active init q
File contains a list of users who are able to shut down the system /etc/shutdown.allow
Prevent fsck from running after the reboot and allow the system to boot faster shutdown -f
Force fsck to run on reboot Shutdown -F
Created by: johnadream