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mt(1)									 mt(1)

Name
       mt - magnetic tape manipulating program

Syntax
       mt [-f tapename] command [count]

Description
       The command permits the operation of a magnetic tape drive.

Options
       The  -f	flag  option uses the specified tape device (next argument) in
       place of either that tape device defined by your TAPE environment vari‐
       able (.login or .profile) or /dev/nrmt0h.

       Some  operations	 may  be performed multiple times by specifying count.
       By default, performs the requested operation once.

       The command argument defines the operation to be	 performed.   Only  as
       many  characters as are required to uniquely identify a command need be
       specified.

       The following is a list of commands:

       bsf		   Backspace count files.

       bsr		   Backspace count records.

       cache		   Allows to use the cache buffer on a tape drive that
			   has the cache buffer feature.

       clhrdsf		   Clear  hardware/software  problem.  Works with tape
			   drives which use the TMSCP tape  controller	inter‐
			   face	 This  command	is  restricted	to root access
			   only.

       clserex		   Clear serious exception.  Works  with  tape	drives
			   which use the TMSCP tape controller interface

       clsub		   Clear  subsystem.  Works with tape drives which use
			   the TMSCP tape controller interface This command is
			   restricted to root access only.

       eof, weof	   Write  count end-of-file marks at the current posi‐
			   tion on the tape.

       eotdis		   Disable end-of-tape detection.   When  the  end  of
			   tape	 is  reached,  the tape will run off the reel.
			   Only the superuser can  issue  this	command.   The
			   command remains in effect for the device until end-
			   of-tape detection is enabled with  the  eoten  com‐
			   mand.

       eoten		   Enable end-of-tape detection.  When the end-of-tape
			   markers are reached, the  tape  is  halted  on  the
			   reel,  between  the	two end-of-tape markers.  Only
			   the superuser can issue this command.  The  command
			   remains  in effect for the device until end-of-tape
			   detection is	 disabled  with	 the  eotdis  command.
			   This is the default mode after a system boot.

       fsf		   Forward-space count files.

       fsr		   Forward-space count records.

       nocache		   Disables  the  use of the cache buffer for any tape
			   drive that has the cache buffer feature.

       offline, rewoffl	   Rewind the tape and place the tape unit off-line.

       retension	   Retensions the tape.	 Retension  means  moving  the
			   tape one complete pass between EOT and BOT.

       rewind		   Rewind the tape.

       status		   Print status information about the tape unit.

Examples
       This example shows how to rewind the tape
       mt -f /dev/rmt0l rewind
       This example shows how to backspace the tape nmt1h three files:
       mt -f /dev/nrmt1h bsf 3
       This  example  shows  how to write two end-of-file marks at the current
       position on tape nmt6h:
       mt -f /dev/nrmt6h eof 2

Return Values
       In shell scripts, returns a 0 exit status when  the  operation(s)  were
       successful,  1  if  the command was unrecognized, and 2 if an operation
       failed.

Files
       /dev/rmt?h or /dev/rmt?l
		 Raw magnetic tape interface with rewind when closed

       /dev/nmt?h or /dev/nmt?l
		 Raw magnetic tape interface with no rewind when closed

See Also
       dd(1), tar(1), ioctl(2), mtio(4), tms(4), environ(7)

									 mt(1)
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