If you do not specify tapename , mt attempts to use the contents of the TAPE environment variable as a tape device name.
Commands Following is a list of the commands which mt accepts.
You must specify only as many characters of a command as necessary to uniquely identify it. The commands in this section accept input from count . This is equivalent to a rewind followed by a fsf count . Note that not all tape devices support this command. The tape is positioned on the first block of the file.