33849ebec9
Some cleanup of the remote tape interface, but a lot more is needed. Ideally, we'd have a "rmt" library which provides a remote tape API including open, read, write, close, and ioctl. This is useful not only for mt, but also for programs like tar, cpio, pax, backup and restore.
163 lines
4.3 KiB
Groff
163 lines
4.3 KiB
Groff
.\" $NetBSD: mt.1,v 1.9 1996/08/08 09:16:06 jtc 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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 June 6, 1993
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.Dt MT 1
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.Os BSD 4
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.Sh NAME
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.Nm mt
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.Nd magnetic tape manipulating program
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.Sh SYNOPSIS
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.Nm mt
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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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.Nm Mt
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is used to give commands to a magnetic tape drive.
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By default
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.Nm mt
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performs the requested operation once. Operations
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may be performed multiple times by specifying
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.Ar count .
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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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.Dq host:tapename ,
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or
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.Dq user@host:tapename ,
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.Nm mt
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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 available commands are listed below. Only as many
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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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Absolute space to
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file
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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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(Count 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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(Count is ignored).
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.It Cm status
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Print status information about the tape unit.
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.It Cm retension
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Retensions the tape (if this operation is supported by the tape unit).
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.It Cm erase
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Erases the tape (if this operation is supported by the tape unit).
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.It Cm eom
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Forward space to the end of the media.
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.It Cm blocksize
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Set the tape blocksize to
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.Ar count
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bytes.
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.It Cm density
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Set the tape density code to
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.Ar count
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as specified in the SCSI2 specification.
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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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does not exist;
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.Nm mt
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uses the device
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.Pa /dev/rst0 .
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.Pp
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.Nm Mt
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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 ENVIRONMENT
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If the following environment variable exists, it is utilized by
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.Nm mt .
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.Bl -tag -width Fl
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.It Ev TAPE
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.Nm Mt
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checks the
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.Ev TAPE
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environment variable if the
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argument
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.Ar tapename
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is not given.
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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 SCSI tape interface
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.It Pa /dev/rmt*
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Raw magnetic tape interface
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.It Pa /usr/src/sys/scsi/scsi_tape.h
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List of SCSI2 density codes
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.El
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.Sh SEE ALSO
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.\".Xr mtio 4 ,
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.Xr dd 1 ,
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.Xr ioctl 2 ,
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.Xr environ 7
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.Sh HISTORY
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The
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.Nm mt
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utility appeared in
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.Bx 4.3 .
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.\" mt.1: mtio(4) missing
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