239 lines
6.7 KiB
Groff
239 lines
6.7 KiB
Groff
.\" 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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.\"
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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
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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
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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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.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 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 erase
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Erase the tape
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(Count is ignored).
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.It Cm retension
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Re-tension the tape
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(one full wind forth and back, 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 blocksize
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Set the block size for the tape unit. Zero means variable-length
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blocks.
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.It Cm density
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Set the density for the tape unit. For the density codes, see below.
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The density value could be given either numerically, or as a string,
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corresponding to the
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.Dq Reference
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field. If the string is abbreviated, it will be resolved in the order
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shown in the table, and the first matching entry will be used. If the
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given string and the resulting canonical density name do not match
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exactly, an informational message is printed about what the given
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string has been taken for.
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.It Cm eom
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Forward space to end of recorded medium
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(Count is ignored).
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.It Cm eod
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Forward space to end of data, identical to
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.Cm eom .
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.It Cm comp
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Set compression mode.
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(The kernel counterpart of this has not yet been reported to work
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correctly.)
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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/nrst0 .
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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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.Pp
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The different density codes are as follows:
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.Pp
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.Dl 0x0 default for device
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.Dl 0xE reserved for ECMA
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.Bd -literal -offset indent
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Value Tracks Density(bpi) Code Type Reference Note
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0x1 9 800 NRZI R X3.22-1983 2
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0x2 9 1600 PE R X3.39-1986 2
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0x3 9 6250 GCR R X3.54-1986 2
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0x5 4/9 8000 GCR C X3.136-1986 1
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0x6 9 3200 PE R X3.157-1987 2
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0x7 4 6400 IMFM C X3.116-1986 1
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0x8 4 8000 GCR CS X3.158-1986 1
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0x9 18 37871 GCR C X3B5/87-099 2
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0xA 22 6667 MFM C X3B5/86-199 1
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0xB 4 1600 PE C X3.56-1986 1
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0xC 24 12690 GCR C HI-TC1 1,5
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0xD 24 25380 GCR C HI-TC2 1,5
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0xF 15 10000 GCR C QIC-120 1,5
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0x10 18 10000 GCR C QIC-150 1,5
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0x11 26 16000 GCR C QIC-320(525?) 1,5
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0x12 30 51667 RLL C QIC-1350 1,5
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0x13 1 61000 DDS CS X3B5/88-185A 4
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0x14 1 43245 RLL CS X3.202-1991 4
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0x15 1 45434 RLL CS ECMA TC17 4
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0x16 48 10000 MFM C X3.193-1990 1
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0x17 48 42500 MFM C X3B5/91-174 1
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.Ed
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where Code means:
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.Bd -literal -offset indent
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NRZI Non Return to Zero, change on ones
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GCR Group Code Recording
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PE Phase Encoded
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IMFM Inverted Modified Frequency Modulation
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MFM Modified Frequency Modulation
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DDS Dat Data Storage
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RLL Run Length Encoding
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.Ed
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where Type means:
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.Bd -literal -offset indent
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R Reel-to-Reel
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C Cartridge
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CS cassette
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.Ed
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where Notes means:
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.Bd -literal -offset indent
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1 Serial Recorded
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2 Parallel Recorded
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3 Old format know as QIC-11
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4 Helical Scan
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5 Not ANSI standard, rather industry standard.
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.Ed
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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[0-9]*xx -compact
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.It Pa /dev/*rwt*
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QIC-02/QIC-36 magnetic tape interface
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.It Pa /dev/*rst[0-9]*
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SCSI magnetic tape interface
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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 wt 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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command appeared in
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.Bx 4.3 .
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.Pp
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Extensions regarding the
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.Xr st 4
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driver appeared in 386BSD 0.1 as a separate
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.Xr st 1
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command, and have been merged into the
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.Nm
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command in
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.Fx 2.1 .
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.Pp
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The former
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.Cm eof
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command that used to be a synonym for
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.Cm weof
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has been abandoned in
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.Fx 2.1
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since it was often confused with
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.Cm eom ,
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which is fairly dangerous.
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