Using the Device-Allocation Utilities
This section describes what the administrator can do with the options to allocate, deallocate, and list_devices
that are usable only by root. The commands are detailed on their
respective man pages.
allocate -F device_special_filename
Reallocates the specified device. This option is often used with the -U option to reallocate the specified device to the specified user. Without
the -U option, the device is allocated to root.
allocate -U username
Causes the device to be allocated to
the user specified rather than to the current user. This option allows you to allocate
a device for another user while you are root, without having to
assume that user's identity.
deallocate -F device_special_filename
Devices that a user has
allocated are not automatically deallocated when the process terminates or when the
user logs out. When a user forgets to deallocate a tape drive, you can force deallocation
using the -F option while you are root.
Forces deallocation of all allocatable devices. This option
should be used only at system initialization.
Run list_devices to get a listing of all the device-special files that are associated
with any device listed in the device_maps file.
list_devices -U username
List the devices that are allocatable
or allocated to the user ID associated with the specified user name. This allows you
to check which devices are allocatable or allocated to another user while you are root.