202 lines
4.9 KiB
Groff
202 lines
4.9 KiB
Groff
.\" $OpenBSD: mt.1,v 1.30 2020/01/16 16:46:46 schwarze Exp $
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.\" $NetBSD: mt.1,v 1.8 1996/05/21 10:23:55 mrg 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 $Mdocdate: January 16 2020 $
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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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.Nm eject
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.Nd magnetic tape and removable media manipulating program
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.Sh SYNOPSIS
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.Nm mt
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.Op Fl f Ar device
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.Ar command
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.Op Ar count
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.Nm eject
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.Op Fl t
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.Ar device
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.Sh DESCRIPTION
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The
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.Nm
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utility sends 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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Note
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that
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.Ar device
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must reference a raw (not block) tape device.
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If
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.Ar device
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is of the form
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.Dq host:device
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or
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.Dq user@host:device ,
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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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.Nm eject
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is simply an alias for
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.Nm mt ,
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with the
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.Cm offline
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command specified.
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.Nm eject
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may also be used to eject other types of removable media.
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.Pp
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The options for
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.Nm
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are as follows:
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.Bl -tag -width Ds
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.It Fl f Ar device
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Operate on the
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.Ar device
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specified.
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.El
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.Pp
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The options for
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.Nm eject
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are as follows:
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.Bl -tag -width Ds
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.It Fl t
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Insert the device instead of ejecting.
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For the
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.Xr cd 4
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driver, this requests that the tray be closed.
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.El
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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 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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.Pq Ar count Li 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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.Pq Ar count Li is ignored .
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On non-tape removable media, the
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.Cm offline
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command causes the media to be ejected when the last operation on it
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closes (i.e., the filesystem is unmounted).
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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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Retension the tape (if this operation is supported by the tape unit).
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.It Cm erase
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Erase 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
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uses the device
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.Pa /dev/rst0 .
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The
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.Ev TAPE
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variable is ignored by
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.Nm eject .
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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 Ds
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.It Ev TAPE
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.Nm
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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 device
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is not given.
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.El
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.Sh FILES
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.Bl -tag -width /usr/src/sys/scsi/scsi_tape.h -compact
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.It Pa /dev/rst*
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raw SCSI 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 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 EXAMPLES
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Eject the first CD device.
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This will work even if there is no CD in the drive:
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.Pp
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.Dl $ eject /dev/rcd0c
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.Sh SEE ALSO
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.Xr cdio 1 ,
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.Xr chio 1 ,
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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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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.At v2 .
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