271 lines
6.2 KiB
Groff
271 lines
6.2 KiB
Groff
.\" $NetBSD: mt.1,v 1.36 2012/03/19 10:48:20 njoly Exp $
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.\"
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.\" Copyright (c) 1981, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mt.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd March 9, 2008
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.Dt MT 1
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.Os
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.Sh NAME
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.Nm mt
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.Nd magnetic tape manipulation
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.Sh SYNOPSIS
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.Nm
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.Op Fl f Ar tapename
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.Ar command
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.Op Ar count
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.Sh DESCRIPTION
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The
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.Nm
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program is used to give commands to a magnetic tape drive.
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By default
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.Nm
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performs the requested operation once.
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Operations may be performed multiple times by specifying
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.Ar count .
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.Pp
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Note
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that
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.Ar tapename
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must reference a raw (not block) tape device.
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If
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.Ar tapename
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is of the form
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.Qq host:tapename ,
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or
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.Qq user@host:tapename ,
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.Nm
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writes to the named tape device on the remote host using
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.Xr rmt 8 .
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.Pp
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The
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.Xr rmt 8
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process on the remote host is typically initiated via
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.Xr rsh 1 ,
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although an alternate method such as
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.Xr ssh 1
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can be specified via the
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.Ev RCMD_CMD
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environment variable.
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.Pp
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The available commands are listed below.
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Only as many characters as are required to uniquely identify a command
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need be specified.
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.Bl -tag -width "eof, weof"
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.It Cm asf
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Move forward
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.Ar count
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files from the beginning of the tape.
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This is accomplished by a rewind followed by fsf
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.Ar count .
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.It Cm eof , weof
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Write
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.Ar count
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end-of-file marks at the current position on the tape.
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.It Cm fsf
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Forward space
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.Ar count
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files.
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.It Cm fsr
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Forward space
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.Ar count
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records.
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.It Cm bsf
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Back space
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.Ar count
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files.
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.It Cm bsr
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Back space
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.Ar count
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records.
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.It Cm rewind
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Rewind the tape.
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(The
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.Ar count
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is ignored.)
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.It Cm offline , rewoffl
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Rewind the tape and place the tape unit off-line.
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Where supported, this ejects the tape.
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(The
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.Ar count
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is ignored.)
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.It Cm status
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Print status information about the tape unit.
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(The
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.Ar count
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is ignored.)
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.It Cm retension
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Retensions the tape.
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Not all tape drives support this feature.
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(The
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.Ar count
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is ignored.)
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.It Cm erase
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Erases the tape
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Not all tape drives support this feature.
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(The
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.Ar count
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is ignored.)
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.It Cm eew
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Enable or disable early warning EOM behaviour.
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Set
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.Ar count
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to nonzero to enable, zero to disable.
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.It Cm eom
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Forward space to the end of recorded media.
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(The
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.Ar count
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is ignored.)
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.It Cm blocksize , setblk
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Set the tape blocksize to
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.Ar count
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bytes.
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A
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.Ar count
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of zero sets variable blocksize.
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.It Cm density , setdensity
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Set the tape density code to
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.Ar count
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as specified in the
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.Tn SCSI-3
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specification.
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See the
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.Sx DENSITY CODES
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section for a list of codes for commonly used media types.
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.It Cm rdspos
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Read the logical block position of the tape.
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Not all tape drives support this feature.
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(The
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.Ar count
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is ignored.)
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.It Cm rdhpos
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Read the hardware block position of the tape.
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Not all tape drives support this feature.
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(The
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.Ar count
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is ignored.)
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.It Cm setspos
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Set the logical block position of the tape to
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.Ar count .
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Not all tape drives support this feature.
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.It Cm sethpos
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Set the hardware block position of the tape to
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.Ar count .
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Not all tape drives support this feature.
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.It Cm compress
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If
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.Ar count
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is zero, disable compression.
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Otherwise enable compression.
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Not all tape drives support this feature.
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.El
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.Pp
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If a tape name is not specified, and the environment variable
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.Ev TAPE
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is not set, then
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.Nm
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uses the device
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.Pa /dev/nrst0 .
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.Sh ENVIRONMENT
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If the following environment variables exist, they are used by
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.Nm .
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.Bl -tag -width Fl
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.It Ev TAPE
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.Nm
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uses device filename given in the
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.Ev TAPE
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environment variable if the
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.Ar tapename
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argument is not given.
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.It Ev RCMD_CMD
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.Nm
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will use
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.Ev RCMD_CMD
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rather than
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.Pa /usr/bin/rsh
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to invoke
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.Xr rmt 8
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on a remote machine.
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The full path name must be specified.
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.El
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.Sh FILES
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.Bl -tag -width /dev/rst* -compact
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.It Pa /dev/rst*
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Raw
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.Tn SCSI
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tape device
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.It Pa /dev/rmt*
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Raw magnetic tape device
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.El
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.Sh EXIT STATUS
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.Nm
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returns a 0 exit status when the operation(s) were successful,
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1 if the command was unrecognized, and 2 if an operation failed.
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.Sh DENSITY CODES
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The SCSI-3 specification defines a number of density codes for
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various tape media, some of which are listed here.
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Note that many tape drive vendors also define model-specific codes.
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.Pp
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.Bl -column "Code" "Format" -compact
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.It Em Code Ta Em Format
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.It Li 0 Ta Device default
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.It Li 1 Ta 1/2" 800 bpi
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.It Li 2 Ta 1/2" 1600 bpi
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.It Li 3 Ta 1/2" 6250 bpi
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.It Li 4 Ta QIC-11
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.It Li 5 Ta QIC-24
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.It Li 15 Ta QIC-120
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.It Li 16 Ta QIC-150
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.It Li 17 Ta QIC-320/525
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.It Li 18 Ta QIC-1320/1350
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.It Li 19 Ta DDS
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.It Li 28 Ta QIC-385M
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.It Li 29 Ta QIC-410M
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.It Li 30 Ta QIC-1000C
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.It Li 31 Ta QIC-2100C
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.It Li 32 Ta QIC-6GB
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.It Li 33 Ta QIC-20GB
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.It Li 34 Ta QIC-2GB
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.It Li 35 Ta QIC-875M
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.It Li 36 Ta DDS-2
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.It Li 37 Ta DDS-3
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.It Li 38 Ta DDS-4
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.El
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.Sh SEE ALSO
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.Xr dd 1 ,
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.Xr ioctl 2 ,
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.Xr mtio 4 ,
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.Xr st 4 ,
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.Xr environ 7
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Bx 4.3 .
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