The t-det command detaches the tape from the current process, or from another process. If no device number is specified, then all tape devices currently attached to this process are detached.
t-det {device.num} {(options}
| device.number | Number of tape devices. If no device number is specified, then all devices currently attached are detached. | |
| options | u | Detaches the tape unit from any port except the spooler, which detaches automatically at the end of each job, and the transaction logger. This requires a sys2 privilege level. A device number is required. |
| z | Works only if the owner is the transaction logger. | |
On D3 UNIX systems, this command detaches the tape from the current port, so that other processes, other UNIX users, or other D3 virtual machines may use it. The u option sends a UNIX signal to the process that owns the tape to force it to close the device. This is done through the trap mechanism.
The t-det command is the default trap for this signal. If the system administrator disables this trap, or uses another command (like displaying a message to ask the user to detach the tape instead of taking the tape forcefully), the command fails with the message:
The tape is not available for use now
The t-det (u command must be utilized with a specific tape device number or the (u option is ignored.