shutdown -s -t 60: Shut down the computer after 60 seconds.
shutdown -s -t 3600 -c "System update is in progress. Please save your work.": Shut down the computer after 3600 seconds and display the comment "System update is in progress. Please save your work.".
shutdown -a: Cancel the previously scheduled shutdown operation.
shutdown -r: Restart the computer.
shutdown -l: Log off the current user.
shutdown -i: Display the remote shutdown interface of the graphical user interface, where you can select a remote computer and perform a shutdown operation.
shutdown -f: Force close all applications and shut down the computer.