1.\" Copyright (c) 1981, 1990 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by the University of 16.\" California, Berkeley and its contributors. 17.\" 4. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" from: @(#)mt.1 6.7 (Berkeley) 7/28/91 34.\" $Id: mt.1,v 1.3 1994/10/16 11:46:49 andrew Exp $ 35.\" 36.Dd July 28, 1991 37.Dt MT 1 38.Os BSD 4 39.Sh NAME 40.Nm mt 41.Nd magnetic tape manipulating program 42.Sh SYNOPSIS 43.Nm mt 44.Op Fl f Ar tapename 45.Ar command 46.Op Ar count 47.Sh DESCRIPTION 48.Nm Mt 49is used to give commands to a magnetic tape drive. 50By default 51.Nm mt 52performs the requested operation once. Operations 53may be performed multiple times by specifying 54.Ar count . 55Note 56that 57.Ar tapename 58must reference a raw (not block) tape device. 59.Pp 60The available commands are listed below. Only as many 61characters as are required to uniquely identify a command 62need be specified. 63.Bl -tag -width "eof, weof" 64.It Cm eof , weof 65Write 66.Ar count 67end-of-file marks at the current position on the tape. 68.It Cm fsf 69Forward space 70.Ar count 71files. 72.It Cm fsr 73Forward space 74.Ar count 75records. 76.It Cm bsf 77Back space 78.Ar count 79files. 80.It Cm bsr 81Back space 82.Ar count 83records. 84.It Cm rewind 85Rewind the tape 86(Count is ignored). 87.It Cm offline , rewoffl 88Rewind the tape and place the tape unit off-line 89(Count is ignored). 90.It Cm status 91Print status information about the tape unit. 92.It Cm retension 93Retensions the tape (if this operation is supported by the tape unit). 94.It Cm erase 95Erases the tape (if this operation is supported by the tape unit). 96.It Cm eom 97Forward space to the end of the media. 98.El 99.Pp 100If a tape name is not specified, and the environment variable 101.Ev TAPE 102does not exist; 103.Nm mt 104uses the device 105.Pa /dev/rmt12 . 106.Pp 107.Nm Mt 108returns a 0 exit status when the operation(s) were successful, 1091 if the command was unrecognized, and 2 if an operation failed. 110.Sh ENVIRONMENT 111If the following environment variable exists, it is utilized by 112.Nm mt . 113.Bl -tag -width Fl 114.It Ev TAPE 115.Nm Mt 116checks the 117.Ev TAPE 118environment variable if the 119argument 120.Ar tapename 121is not given. 122.Sh FILES 123.Bl -tag -width /dev/rmt* -compact 124.It Pa /dev/rmt* 125Raw magnetic tape interface 126.El 127.Sh SEE ALSO 128.\".Xr mtio 4 , 129.Xr dd 1 , 130.Xr ioctl 2 , 131.Xr environ 7 132.Sh HISTORY 133The 134.Nm mt 135command appeared in 136.Bx 4.3 . 137.\" mt.1: mtio(4) missing 138