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
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
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 only
be used 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.