With this tool you can schedule regular shutdowns of workstations in the evening, and also wake them up every morning, using either nvram-wakeup, ACPI wakeup or wake-on-lan.
For the wake-on-lan wake-up sequence you need one awake machine on your local network / subnet. This can be a server machine or a client machine that got just previously woken up by nvram-wakeup.
The shutdown sequence will be initiated hourly after 4pm via a CRON job. However, only machines that appear inactive / unused will be shut down. Machines that are currently in use will remain up and running.
The Shutdown-at-Night tool can be activated via a config file or via membership in a NIS netgroup called shutdown-at-night-hosts.