The controlling the system chapter details commands that you may wish to use to interact with devices on your system and then details how to control processes and services/daemons.
eject simply tells a device to open (eject) the drive. Useful for cdrom/DVD drives.
For example the command below would eject the cdrom-drive (if your cdrom is linked to /dev/cdrom):
|This won't work unless|
This will only work if the user has permission to mount the partition. Please see the tip in Section 9.1 for more information.