1.\" Copyright (c) 1981, 1990, 1993 2.\" The Regents of the University of California. 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.\" @(#)mt.1 8.1 (Berkeley) 6/6/93 34.\" 35.Dd June 6, 1993 36.Dt MT 1 37.Os BSD 4 38.Sh NAME 39.Nm mt 40.Nd magnetic tape manipulating program 41.Sh SYNOPSIS 42.Nm mt 43.Op Fl f Ar tapename 44.Ar command 45.Op Ar count 46.Sh DESCRIPTION 47.Nm Mt 48is used to give commands to a magnetic tape drive. 49By default 50.Nm mt 51performs the requested operation once. Operations 52may be performed multiple times by specifying 53.Ar count . 54Note 55that 56.Ar tapename 57must reference a raw (not block) tape device. 58.Pp 59The available commands are listed below. Only as many 60characters as are required to uniquely identify a command 61need be specified. 62.Bl -tag -width "eof, weof" 63.It Cm eof , weof 64Write 65.Ar count 66end-of-file marks at the current position on the tape. 67.It Cm fsf 68Forward space 69.Ar count 70files. 71.It Cm fsr 72Forward space 73.Ar count 74records. 75.It Cm bsf 76Back space 77.Ar count 78files. 79.It Cm bsr 80Back space 81.Ar count 82records. 83.It Cm rewind 84Rewind the tape 85(Count is ignored). 86.It Cm offline , rewoffl 87Rewind the tape and place the tape unit off-line 88(Count is ignored). 89.It Cm erase 90Erase the tape 91(Count is ignored). 92.It Cm status 93Print status information about the tape unit. 94.El 95.Pp 96If a tape name is not specified, and the environment variable 97.Ev TAPE 98does not exist; 99.Nm mt 100uses the device 101.Pa /dev/rmt12 . 102.Pp 103.Nm Mt 104returns a 0 exit status when the operation(s) were successful, 1051 if the command was unrecognized, and 2 if an operation failed. 106.Sh ENVIRONMENT 107If the following environment variable exists, it is utilized by 108.Nm mt . 109.Bl -tag -width Fl 110.It Ev TAPE 111.Nm Mt 112checks the 113.Ev TAPE 114environment variable if the 115argument 116.Ar tapename 117is not given. 118.Sh FILES 119.Bl -tag -width /dev/rmt* -compact 120.It Pa /dev/rmt* 121Raw magnetic tape interface 122.El 123.Sh SEE ALSO 124.\".Xr mtio 4 , 125.Xr dd 1 , 126.Xr ioctl 2 , 127.Xr environ 7 128.Sh HISTORY 129The 130.Nm mt 131command appeared in 132.Bx 4.3 . 133.Pp 134Erase function added by Andreas Klemm <andreas@knobel.gun.de> 10/94. 135.\" mt.1: mtio(4) missing 136