mt - magnetic tape utility
mt [-v] [-f device]
    command [count]
The mt command performs certain control operations on tape
    devices. If no device is specified with the -f option and the
    TAPE environment is not set, the device /dev/rmt/c0s0n is used.
The command argument may be one of:
  - erase
 
  - Erase the entire tape.
 
  - rewind
 
  - Rewind the tape.
 
  - retension,
    ret
 
  - Rewind the tape, then wind it to the end of reel, and rewind it
    again.
 
  - wfm, eof,
    weof
 
  - Write a file mark at the current position.
 
  - sfm, fsf
 
  - Seek past the next file mark.
 
  - bsf
 
  - Seek back over the previous file mark.
 
  - fsr
 
  - Seek forward to next record.
 
  - bsf
 
  - Seek backward to previous record.
 
  - enddata,
    append, feom
 
  - Seek past the end of written data.
 
  - offline,
    rewoffl
 
  - Rewind the tape and place the tape unit offline.
 
  - status
 
  - Report the status of the tape device.
 
The optional count argument specifies the number of blocks
    or records to seek, marks to be written, etc.
The -v option causes mt to report the status of the
    tape device.
  - TAPE
 
  - Used as tape device if no device argument is given on the command
    line.