mt:tldr:f7840

The command "mt -f ${-dev-nstX} eject" is used to eject a magnetic tape from the tape drive specified by the device name "-dev-nstX".

Let's break down the command:

• "mt" is a command line utility used to control and perform operations on magnetic tape devices.
• "-f" is an option used to specify the tape device. In this case, the device name is specified as "${-dev-nstX}". The "${-dev-nstX}" part is likely a placeholder or variable that needs to be replaced with the actual device name, such as "/dev/nst0" or "/dev/nst1".
• "eject" is the operation or action to be performed on the tape device. In this case, it means ejecting the tape from the drive.

So, to use this command, you need to replace "${-dev-nstX}" with the actual device name of the tape drive you want to eject. For example, if your tape drive is "/dev/nst0", the command would be: "mt -f /dev/nst0 eject".