HP Integrity rx6600 User's & Service Manual page 134

For details, see the shutdown(8) Linux manpage. Also see the Linux manpage for the poweroff
command.
To shutdown Linux, follow these steps:
1. Log in to Linux running on the system you want to shut down.
2. Issue the shutdown command with the desired command-line options, and include the required
time argument to specify when the operating system shutdown is to occur.
For example, shutdown -r +20 shuts down and reboots the system in twenty minutes.
134 Booting and Shutting Down the Operating System