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Revision 1.34, Sun Mar 9 20:59:13 2008 UTC (13 years, 1 month ago) by dholland
Grammar fix and clarification from PR 37727 by Randolf Richardson. While here, do some of my own grammar and formatting fixes too. Bump date.
.\" $NetBSD: mt.1,v 1.34 2008/03/09 20:59:13 dholland 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. 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 March 9, 2008 .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. (The .Ar count is ignored.) .It Cm offline , rewoffl Rewind the tape and place the tape unit off-line. Where supported, this ejects the tape. (The .Ar count is ignored.) .It Cm status Print status information about the tape unit. (The .Ar count is ignored.) .It Cm retension Retensions the tape. Not all tape drives support this feature. (The .Ar count is ignored.) .It Cm erase Erases the tape Not all tape drives support this feature. (The .Ar count is ignored.) .It Cm eew Enable or disable early warning EOM behaviour. Set .Ar count to nonzero to enable, zero to disable. .It Cm eom Forward space to the end of recorded media. (The .Ar 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. (The .Ar count is ignored.) .It Cm rdhpos Read the hardware block position of the tape. Not all tape drives support this feature. (The .Ar 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 used 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 .