c066b768e7
to file count", which is incorrect. File numbering, according to restore(8), starts at one, and thus "mt asf 1" neither moves to the first file on the tape nor to file number one on the tape.
251 lines
6.3 KiB
Groff
251 lines
6.3 KiB
Groff
.\" $NetBSD: mt.1,v 1.26 2001/02/03 16:26:45 mason Exp $
|
|
.\"
|
|
.\" Copyright (c) 1981, 1990, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)mt.1 8.1 (Berkeley) 6/6/93
|
|
.\"
|
|
.Dd June 6, 1993
|
|
.Dt MT 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm mt
|
|
.Nd magnetic tape manipulation
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl f Ar tapename
|
|
.Ar command
|
|
.Op Ar count
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
program is used to give commands to a magnetic tape drive.
|
|
By default
|
|
.Nm
|
|
performs the requested operation once.
|
|
Operations may be performed multiple times by specifying
|
|
.Ar count .
|
|
.Pp
|
|
Note
|
|
that
|
|
.Ar tapename
|
|
must reference a raw (not block) tape device.
|
|
If
|
|
.Ar tapename
|
|
is of the form
|
|
.Qq host:tapename ,
|
|
or
|
|
.Qq user@host:tapename ,
|
|
.Nm
|
|
writes to the named tape device on the remote host using
|
|
.Xr rmt 8 .
|
|
.Pp
|
|
The
|
|
.Xr rmt 8
|
|
process on the remote host is typically initiated via
|
|
.Xr rsh 1 ,
|
|
although an alternate method such as
|
|
.Xr ssh 1
|
|
can be specified via the
|
|
.Ev RCMD_CMD
|
|
environment variable.
|
|
.Pp
|
|
The available commands are listed below.
|
|
Only as many characters as are required to uniquely identify a command
|
|
need be specified.
|
|
.Bl -tag -width "eof, weof"
|
|
.It Cm asf
|
|
Move forward
|
|
.Ar count
|
|
files from the beginning of the tape. This is accomplished by a rewind
|
|
followed by fsf
|
|
.Ar count .
|
|
.It Cm eof , weof
|
|
Write
|
|
.Ar count
|
|
end-of-file marks at the current position on the tape.
|
|
.It Cm fsf
|
|
Forward space
|
|
.Ar count
|
|
files.
|
|
.It Cm fsr
|
|
Forward space
|
|
.Ar count
|
|
records.
|
|
.It Cm bsf
|
|
Back space
|
|
.Ar count
|
|
files.
|
|
.It Cm bsr
|
|
Back space
|
|
.Ar count
|
|
records.
|
|
.It Cm rewind
|
|
Rewind the tape
|
|
(Count is ignored).
|
|
.It Cm offline , rewoffl
|
|
Rewind the tape and place the tape unit off-line
|
|
(Count is ignored).
|
|
.It Cm status
|
|
Print status information about the tape unit
|
|
(Count is ignored).
|
|
.It Cm retension
|
|
Retensions the tape (if this operation is supported by the tape unit,
|
|
count is ignored).
|
|
.It Cm erase
|
|
Erases the tape (if this operation is supported by the tape unit,
|
|
count is ignored).
|
|
.It Cm eew
|
|
Enable or disabled early warning EOM behaviour.
|
|
.Ar Count
|
|
is set to nonzero to enable, zero to disable.
|
|
.It Cm eom
|
|
Forward space to the end of recorded media
|
|
(Count is ignored).
|
|
.It Cm blocksize , setblk
|
|
Set the tape blocksize to
|
|
.Ar count
|
|
bytes.
|
|
A
|
|
.Ar count
|
|
of zero sets variable blocksize.
|
|
.It Cm density , setdensity
|
|
Set the tape density code to
|
|
.Ar count
|
|
as specified in the
|
|
.Tn SCSI-3
|
|
specification. See the
|
|
.Sx DENSITY CODES
|
|
section for a list of codes for commonly used media types.
|
|
.It Cm rdspos
|
|
Read the logical block position of the tape (not all tape
|
|
drives support this feature, count is ignored).
|
|
.It Cm rdhpos
|
|
Read the hardware block position of the tape (not all tape
|
|
drives support this feature, count is ignored).
|
|
.It Cm setspos
|
|
Set the logical block position of the tape to
|
|
.Ar count
|
|
(not all tape drives support this feature).
|
|
.It Cm sethpos
|
|
Set the hardware block position of the tape to
|
|
.Ar count
|
|
(not all tape drives support this feature).
|
|
.It Cm compress
|
|
If
|
|
.Ar count
|
|
is zero, disable compression.
|
|
Otherwise enable compression (not all tape drives support this feature).
|
|
.El
|
|
.Pp
|
|
If a tape name is not specified, and the environment variable
|
|
.Ev TAPE
|
|
is not set, then
|
|
.Nm
|
|
uses the device
|
|
.Pa /dev/nrst0 .
|
|
.Sh EXIT STATUS
|
|
.Nm
|
|
returns a 0 exit status when the operation(s) were successful,
|
|
1 if the command was unrecognized, and 2 if an operation failed.
|
|
.Sh DENSITY CODES
|
|
The SCSI-3 specification defines a number of density codes for
|
|
various tape media, some of which are listed here. Note that
|
|
many tape drive vendors also define model-specific codes.
|
|
.Pp
|
|
.Bl -column "Code" "Format" -compact
|
|
.It Em "Code Format"
|
|
.It Li 0 Ta Device default
|
|
.It Li 1 Ta 1/2" 800 bpi
|
|
.It Li 2 Ta 1/2" 1600 bpi
|
|
.It Li 3 Ta 1/2" 6250 bpi
|
|
.It Li 4 Ta QIC-11
|
|
.It Li 5 Ta QIC-24
|
|
.It Li 15 Ta QIC-120
|
|
.It Li 16 Ta QIC-150
|
|
.It Li 17 Ta QIC-320/525
|
|
.It Li 18 Ta QIC-1320/1350
|
|
.It Li 19 Ta DDS
|
|
.It Li 28 Ta QIC-385M
|
|
.It Li 29 Ta QIC-410M
|
|
.It Li 30 Ta QIC-1000C
|
|
.It Li 31 Ta QIC-2100C
|
|
.It Li 32 Ta QIC-6GB
|
|
.It Li 33 Ta QIC-20GB
|
|
.It Li 34 Ta QIC-2GB
|
|
.It Li 35 Ta QIC-875M
|
|
.It Li 36 Ta DDS-2
|
|
.It Li 37 Ta DDS-3
|
|
.It Li 38 Ta DDS-4
|
|
.El
|
|
.Sh ENVIRONMENT
|
|
If the following environment variables exist, they are utilized by
|
|
.Nm "" .
|
|
.Bl -tag -width Fl
|
|
.It Ev TAPE
|
|
.Nm
|
|
uses device filename given in the
|
|
.Ev TAPE
|
|
environment variable if the
|
|
.Ar tapename
|
|
argument is not given.
|
|
.It Ev RCMD_CMD
|
|
.Nm
|
|
will use
|
|
.Ev RCMD_CMD
|
|
rather than
|
|
.Pa /usr/bin/rsh
|
|
to invoke
|
|
.Xr rmt 8
|
|
on a remote machine.
|
|
The full path name must be specified.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width /dev/rst* -compact
|
|
.It Pa /dev/rst*
|
|
Raw
|
|
.Tn SCSI
|
|
tape device
|
|
.It Pa /dev/rmt*
|
|
Raw magnetic tape device
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr dd 1 ,
|
|
.Xr ioctl 2 ,
|
|
.Xr mtio 4 ,
|
|
.Xr st 4 ,
|
|
.Xr environ 7
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
utility appeared in
|
|
.Bx 4.3 .
|