mt(1)                               CLIX                               mt(1)



  NAME

    mt - Gives commands to a magnetic tape drive

  SYNOPSIS

    mt [-f tape-name] command [count]

  DESCRIPTION

    The mt command is used to give commands to a magnetic tape drive.  If a
    tape name is not specified with the -f flag, the environment variable TAPE
    is used.  If TAPE does not exist, mt uses the device /dev/rmt/0mn.  By
    default, mt performs the requested operation once.  Operations may be
    performed count times by specifying count.

    The available commands are listed below.

    eof         See weof.

    weof        Write count end-of-file marks at the current position on the
                tape.

    fsf         Forward space count files.

    fsr         Forward space count records.

    bsf         Backward space count files.

    bsr         Backward space count records.

    rewind      Rewind the tape (count is ignored).

    offline     See rewoff.

    rewoff      Rewind the tape and place the tape unit offline (count is
                ignored).

    fseot       Forward space to end of recorded media (count is ignored).

    erase       Erase the entire tape (count is ignored).

    retension   Retension the tape (count is ignored).

    status      Display status information about the tape unit (count is
                ignored).

    density     Set recording density to count.

    Values for count (for the density command) are defined as follows:




  2/94 - Intergraph Corporation                                              1

  mt(1)                               CLIX                               mt(1)



      Cartridge     Helical Scan   Half-inch Reel
      QIC Formats   EXB Formats    Densities (BPI)   4mm DDS formats
      ___________   ____________   _______________   ______________________
      11            8200           800               0 (Default)
      24            8205           1600              1 (DDS 1 uncompressed)
      120           8500           3200              2 (DDS 1 compressed)
      150           8505           6250              3 (DDS 2 uncompressed)
                                                     4 (DDS 2 compressed)

  EXAMPLES

    1.  The following command retensions the tape attached to SCSI port 6:

        mt -f /dev/rdsk/mt6 retension


    2.  The following command returns the status of the tape device attached
        to SCSI port 5:

        mt -f /dev/rdsk/mt5 status


    3.  To set density of tape device to 8205, key in the following command:

        mt -f /dev/rmt/mt6 density 8205


  FILES

    /dev/rmt/*
    /dev/rmt/0mn

  NOTES

    The erase operation for an Exabyte tape drive can take 2 hours or more to
    complete.  Once started, the only way to stop the erase operation is to
    reboot the system.

  EXIT VALUES

    The mt command returns a 0 exit value when the command is successful, 1 if
    the command is unrecognized, and 2 if the command fails.

  RELATED INFORMATION

    Commands:  mtio(7)

    Files:  tc(7)






  2                                              Intergraph Corporation - 2/94