shutdown | The default behavior of shutdown is usually to schedule shutdown for one minute. |
shutdown -c | Cancel a pending shutdown. |
shutdown 23:00 | Schedule a shutdown for 11 PM. |
shutdown +15 | Schedule a shutdown for 15 minutes from now. |
shutdown now | Shutdown immediately. |
shutdown +5 "Save now!" | Shutdown in 5 minutes and broadcast the message "Save now!" to all terminals. |
shutdown -H | Halt the machine. This is traditionally a drastic type of shutdown similar to a hard power-off. However, this may be implemented as a normal and immediate shutdown. |
shutdown -P | Poweroff the machine with shutdown. This is usually the default but can be specified to remove any ambiguity. |
shutdown -r | Reboot the machine. |
halt -f | Halts the machine without notifying any processes. This is perhaps the most immediate and drastic way to halt a linux box. The -f stands for force. |
poweroff | Another command to power-off a linux box. Accepts the -f flag for a forced power-off. |
reboot | Reboot the box. Accepts the -f flag. Does not allow for a scheduled reboot as with the shutdown command. |
