mt:tldr:713ff
The command "mt -f ${-dev-nstX} fsf ${count}" is used to control a magnetic tape drive using the "mt" command in a Unix-like operating system. Here is a breakdown of the command:
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"mt": It is the command used to control magnetic tape drives and perform various operations on them.
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"-f": It is an option to specify the tape device file to be used. In this case, the tape device file is denoted by "${-dev-nstX}". The "${-dev-nstX}" is a placeholder, and the actual value would be provided when running the command. The "n" represents the tape drive number, "s" represents the controller number, and "t" represents the tape type. "X" is a number denoting the tape drive index (e.g., 0, 1, 2).
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"fsf": It is a command to skip forward a specified number of file marks on the tape. "fsf" stands for "forward space files."
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"${count}": Again, "${count}" is a placeholder for an actual value that needs to be provided. It represents the number of file marks to skip forward. It can be any positive integer.
So, when you run the command with the actual tape device file and count, it will skip forward the specified number of file marks on the magnetic tape.