mt:tldr:a0791

The command "mt -f {{/dev/nstX} eof}" is used to set a tape device to the end-of-file (EOF) marker.

Here's a breakdown of the command:

• "mt" stands for "Magnetic Tape Control" and refers to a utility used to control tape devices on Unix-like systems.
• "-f" specifies the tape device file to operate on. In this case, "{{/dev/nstX}" is a placeholder for the actual tape device file. For example, it could be "/dev/nst0" or "/dev/nst1", depending on the system configuration.
• "eof" is a command used to position the tape at the end-of-file marker. It marks the current position on the tape as the logical end of the recorded data.

In summary, when you run this command, it will set the specified tape device to the end-of-file marker, indicating that any subsequent reads or writes will begin from the logical end of the recorded data.