# 2.11BSD#431 - /usr/man/cat1/mt.0

    MT(1)		    UNIX Programmer's Manual		    MT(1)

    NAME
         mt - magnetic tape manipulating program

    SYNOPSIS
         mt [ -f tapename ] command [ count ]

    DESCRIPTION
         Mt is used to give commands to a magnetic tape drive.  If a
         tape name is not specified, the environment variable TAPE is
         used;  if TAPE does not exist, mt uses the device
         /dev/rmt12.  Note that tapename must reference a raw (not
         block) tape device.  By default mt performs the requested
         operation once.  Operations may be performed multiple times
         by specifying count.

         The available commands are listed below.  Only as many char-
         acters as are required to uniquely identify a command need
         be specified.

         eof, 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  Back space count files.

         bsr  Back space count records.

         rewind
    	  Rewind the tape (Count is ignored).

         offline, rewoffl
    	  Rewind the tape and place the tape unit off-line (Count
    	  is ignored).

         status
    	  Print status information about the tape unit.

         cacheon
    	  Enable the readahead/writebehind cache on the tape
    	  unit.

         cacheoff
    	  Turn off the readahead/writebehind cache on the tape
    	  unit.

         Mt returns a 0 exit status when the operation(s) were suc-
         cessful, 1 if the command was unrecognized, and 2 if an
         operation failed.

    Printed 11/26/99	December 22, 1995			1

    MT(1)		    UNIX Programmer's Manual		    MT(1)

         The cacheon and cacheoff commands currently only apply to
         the TMSCP driver and then only for certain drives such as
         the TU81+.  No error is produced by the TMSCP driver if the
         cache commands are used.  Other drivers will return an error
         code since they do not recognize the MTCACHE and MTNOCACHE
         functions codes.  See mtio(4).

    FILES
         /dev/rmt* Raw magnetic tape interface

    SEE ALSO
         mtio(4), tmscp(4), dd(1), ioctl(2), environ(7)

    Printed 11/26/99	December 22, 1995			2

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