226 lines
6.5 KiB
Groff
226 lines
6.5 KiB
Groff
.\" 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 BSD 4
|
|
.Sh NAME
|
|
.Nm mt
|
|
.Nd magnetic tape manipulating program
|
|
.Sh SYNOPSIS
|
|
.Nm mt
|
|
.Op Fl f Ar tapename
|
|
.Ar command
|
|
.Op Ar count
|
|
.Sh DESCRIPTION
|
|
.Nm Mt
|
|
is used to give commands to a magnetic tape drive.
|
|
By default
|
|
.Nm mt
|
|
performs the requested operation once. Operations
|
|
may be performed multiple times by specifying
|
|
.Ar count .
|
|
Note
|
|
that
|
|
.Ar tapename
|
|
must reference a raw (not block) tape device.
|
|
.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 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 erase
|
|
Erase the tape
|
|
(Count is ignored).
|
|
.It Cm retension
|
|
Re-tension the tape
|
|
(one full wind forth and back, Count is ignored).
|
|
.It Cm status
|
|
Print status information about the tape unit.
|
|
.It Cm blocksize
|
|
Set the block size for the tape unit. Zero means variable-length
|
|
blocks.
|
|
.It Cm density
|
|
Set the density for the tape unit. For the density codes, see below.
|
|
The density value could be given either numerically, or as a string,
|
|
corresponding to the
|
|
.Dq Reference
|
|
field. If the string is abbreviated, it will be resolved in the order
|
|
shown in the table, and the first matching entry will be used. If the
|
|
given string and the resulting canonical density name do not match
|
|
exactly, an informational message is printed about what the given
|
|
string has been taken for.
|
|
.It Cm eom
|
|
Forward space to end of recorded medium
|
|
(Count is ignored).
|
|
.It Cm comp
|
|
Set compression mode.
|
|
(Not yet implemented.)
|
|
.El
|
|
.Pp
|
|
If a tape name is not specified, and the environment variable
|
|
.Ev TAPE
|
|
does not exist;
|
|
.Nm mt
|
|
uses the device
|
|
.Pa /dev/nrst0 .
|
|
.Pp
|
|
.Nm Mt
|
|
returns a 0 exit status when the operation(s) were successful,
|
|
1 if the command was unrecognized, and 2 if an operation failed.
|
|
.Pp
|
|
The different density codes are as follows:
|
|
.Pp
|
|
.Dl 0x0 default for device
|
|
.Dl 0xE reserved for ECMA
|
|
.Bd -literal -offset indent
|
|
Value Tracks Density(bpi) Code Type Reference Note
|
|
0x1 9 800 NRZI R X3.22-1983 2
|
|
0x2 9 1600 PE R X3.39-1986 2
|
|
0x3 9 6250 GCR R X3.54-1986 2
|
|
0x5 4/9 8000 GCR C X3.136-1986 1
|
|
0x6 9 3200 PE R X3.157-1987 2
|
|
0x7 4 6400 IMFM C X3.116-1986 1
|
|
0x8 4 8000 GCR CS X3.158-1986 1
|
|
0x9 18 37871 GCR C X3B5/87-099 2
|
|
0xA 22 6667 MFM C X3B5/86-199 1
|
|
0xB 4 1600 PE C X3.56-1986 1
|
|
0xC 24 12690 GCR C HI-TC1 1,5
|
|
0xD 24 25380 GCR C HI-TC2 1,5
|
|
0xF 15 10000 GCR C QIC-120 1,5
|
|
0x10 18 10000 GCR C QIC-150 1,5
|
|
0x11 26 16000 GCR C QIC-320(525?) 1,5
|
|
0x12 30 51667 RLL C QIC-1350 1,5
|
|
0x13 1 61000 DDS CS X3B5/88-185A 4
|
|
0x14 1 43245 RLL CS X3.202-1991 4
|
|
0x15 1 45434 RLL CS ECMA TC17 4
|
|
0x16 48 10000 MFM C X3.193-1990 1
|
|
0x17 48 42500 MFM C X3B5/91-174 1
|
|
.Ed
|
|
|
|
where Code means:
|
|
.Bd -literal -offset indent
|
|
NRZI Non Return to Zero, change on ones
|
|
GCR Group Code Recording
|
|
PE Phase Encoded
|
|
IMFM Inverted Modified Frequency Modulation
|
|
MFM Modified Frequency Modulation
|
|
DDS Dat Data Storage
|
|
RLL Run Length Encoding
|
|
.Ed
|
|
|
|
where Type means:
|
|
.Bd -literal -offset indent
|
|
R Reel-to-Reel
|
|
C Cartridge
|
|
CS cassette
|
|
.Ed
|
|
|
|
where Notes means:
|
|
.Bd -literal -offset indent
|
|
1 Serial Recorded
|
|
2 Parallel Recorded
|
|
3 Old format know as QIC-11
|
|
4 Helical Scan
|
|
5 Not ANSI standard, rather industry standard.
|
|
.Ed
|
|
|
|
.Sh ENVIRONMENT
|
|
If the following environment variable exists, it is utilized by
|
|
.Nm mt .
|
|
.Bl -tag -width Fl
|
|
.It Ev TAPE
|
|
.Nm Mt
|
|
checks the
|
|
.Ev TAPE
|
|
environment variable if the
|
|
argument
|
|
.Ar tapename
|
|
is not given.
|
|
.Sh FILES
|
|
.Bl -tag -width /dev/rwt* -compact
|
|
.It Pa /dev/rwt*
|
|
Raw magnetic tape interface
|
|
.It Pa /dev/*st[0-9]*
|
|
SCSI magnetic tape interface
|
|
.El
|
|
.Sh SEE ALSO
|
|
.\".Xr mtio 4 ,
|
|
.Xr st 4 ,
|
|
.\".Xr wt 4 ,
|
|
.Xr dd 1 ,
|
|
.Xr ioctl 2 ,
|
|
.Xr environ 7
|
|
.Sh HISTORY
|
|
The
|
|
.Nm mt
|
|
command appeared in
|
|
.Bx 4.3 .
|
|
|
|
Extensions regarding the
|
|
.Xr st 4
|
|
driver appeared in 386BSD 0.1 as a separate
|
|
.Xr st 1
|
|
command, and have been merged into the
|
|
.Nm
|
|
command in FreeBSD 2.1.
|
|
.\" mt.1: mtio(4) missing
|
|
.\" mt.1: wt(4) missing
|