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mt(1)				 User Commands				 mt(1)

NAME
       mt - magnetic tape control

SYNOPSIS
       mt [-f tapename]	command... [count]

DESCRIPTION
       The  mt utility sends commands to a magnetic tape drive.	If -f tapename
       is not specified, the environment variable TAPE is used.	If  TAPE  does
       not exist, mt uses the device /dev/rmt/0n.

OPTIONS
       The following option is supported:

       -f tapename     Specifies the raw tape device.

OPERANDS
       The following operands are supported:

       count	       The  number of times that the requested operation is to
		       be performed. By	default, mt  performs	command	 once.
		       Multiple	 operations  of	  command  may be performed by
		       specifying count.

       command	       Available commands that can be sent to a	magnetic  tape
		       drive.  Only  as	 many  characters  as  are required to
		       uniquely	identify a command need	be specified.

		       eof	       Writes count EOF	marks at  the  current
		       weof	       position	on the tape.

		       fsf	       Forward	spaces	over  count EOF	marks.
				       The tape	is  positioned	on  the	 first
				       block of	the file.

		       fsr	       Forward spaces count records.

		       bsf	       Back  spaces  over count	EOF marks. The
				       tape is positioned on the beginning-of-
				       tape side of the	 EOF mark.

		       bsr	       Back spaces count records.

		       nbsf	       Back  spaces  count  files. The tape is
				       positioned on the first	block  of  the
				       file.  This  is	equivalent  to count+1
				       bsf's followed by one fsf.

		       asf	       Specifies absolute space	to count  file
				       number.	This is	equivalent to a	rewind
				       followed	by a fsf count.

		       If count	is specified with any of  the  following  com-
		       mands,  the  count  is  ignored and the command is per-
		       formed only once.

		       eom	       Spaces to the end of recorded media  on
				       the  tape. This is useful for appending
				       files onto previously written tapes.

		       rewind	       Rewinds the tape.

		       offline	       Rewinds the tape	and,  if  appropriate,
		       rewoffl	       takes  the  drive unit  off-line	by un-
				       loading the tape.

		       status	       Prints  status  information  about  the
				       tape unit.

		       retension       Rewinds	the cartridge tape completely,
				       then winds it forward to	the end	of the
				       reel  and  back to beginning-of-tape to
				       smooth out tape tension.

		       reserve	       Allows the tape	drive  to  remain  re-
				       served  after  closing  the device. The
				       drive must then be explicitly released.

		       release	       Re-establishes the default behavior  of
				       releasing at close.

		       forcereserve    Breaks  the  reservation	 of  the  tape
				       drive held by another host and then re-
				       serves the tape drive. This command can
				       be executed only	with super-user	privi-
				       leges.

		       erase	       Erases  the  entire tape. Caution: Some
				       tape drives have	option settings	 where
				       only   portions	of  the	 tape  may  be
				       erased. Be sure to select  the  correct
				       setting	to erase the whole tape. Eras-
				       ing a tape may take a long time depend-
				       ing on the device and/or	tape. Refer to
				       the device specific manual for time de-
				       tails.

		       config	       Reads  the drives current configuration
				       from the	 driver	 and  displays	it  in
				       st.conf	format.	See st(7D) for defini-
				       tion of fields and there	meanings.

EXIT STATUS
       0	All operations were successful.

       1	Command	was unrecognized or mt was unable to open  the	speci-
		fied tape drive.

       2	An operation failed.

FILES
       /dev/rmt/*      magnetic	tape interface

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       tar(1),	tcopy(1),  ar.h(3HEAD),	 environ(4), attributes(5), mtio( 7I),
       st(7D)

BUGS
       Not all devices support all options. Some options  are  hardware-depen-
       dent. Refer to the corresponding	device manual page.

       mt  is  architecture sensitive. Heterogeneous operation (that is, SPARC
       to x86 or the reverse) is not supported.

SunOS 5.10			  1 Sep	2004				 mt(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | EXIT STATUS | FILES | ATTRIBUTES | SEE ALSO | BUGS

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