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MT(1)									 MT(1)

NAME
       mt - magnetic tape control

SYNOPSIS
       mt [-f device] [count]

DESCRIPTION
       Mt  is  a  user	interface  to  the magnetic tape commands described in
       mtio(4).	 It allows one to space a tape forwards	 or  backwards,	 write
       end of file markers, etc.

       With  the  -f option a tape device can be named, otherwise the environā€
       ment variable TAPE is used if set.  Standard input is used if the  tape
       name is a dash (-).  The count argument is used to tell how many blocks
       or files to space or how many file markers to write.  It may  be	 a  C-
       style decimal, octal or hexadecimal constant, by default "1".

       Command	is  the	 action to perform, it may be one of the following, or
       any unambiguous prefix (like st for status):

       eof, weof      Write count end-of-file markers.

       fsf	      Forward space count file markers.

       fsr	      Forward space count records.   (The  size	 of  a	record
		      depends on the tape, and may even be variable, depending
		      on the size of the writes.)

       bsf	      Backwards space count files.  The count may be  zero  to
		      backspace	 to  the  start	 of the current file.  (A tape
		      device need not support backwards movement,  or  may  be
		      very  slow  doing it.  Rewinding and forward spacing may
		      be better.)

       bsr	      Backwards space count records.  The tape	is  positioned
		      after  the  last block of the previous file if you hit a
		      filemark when spacing backwards.	The block count is set
		      to  -1  to indicate that the driver has no idea where it
		      is on the previous file.

       eom	      Forward space to the end of media.

       rewind	      Rewind the tape.

       offline, rewoffl
		      Rewind and take offline.	This may cause some drives  to
		      eject the tape.

       status	      Shows the status of the drive, the sense key of the last
		      SCSI error, current file number, current record  number,
		      residual count if the last command that encountered end-
		      of-file, and the current block size.

       retension      Removes tape tension by winding and rewinding  the  tape
		      completely.

       erase	      Erases the tape completely and rewinds it.

       density	      Sets  the	 density  code	to  read  or write the tape to
		      count.  Density codes supported  depend  on  the	drive.
		      This  command  need  not be used if the drive senses the
		      proper density on read and can only write one density.

       blksize, blocksize
		      Sets the block size used to read or write	 the  tape  to
		      count.  This command may be used to select a fixed block
		      size for a variable block size tape.  This will speed up
		      I/O  for	small  block  sizes.   Use a zero count to use
		      variable sized blocks again.

ENVIRONMENT
       TAPE	      Tape drive to use if set.

FILES
       /dev/nrst4     Default tape device.

SEE ALSO
       mtio(4), st(4).

AUTHOR
       Kees J. Bot (kjb@cs.vu.nl)

									 MT(1)
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