You do not need to be running a window system, such as the OpenWindows environment, for the sys-suspend shell command to work. You also do not need to login as superuser.
At the prompt, type:
The Suspend confirmation pop-up window is displayed, as shown in Figure 3-8. If a window system is not running, the command executes without displaying the confirmation pop-up window.
Wait for the system to power off.
Power off all external units.