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 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.It Cm blocksize 95Set the block size for the tape unit. Zero means variable-length 96blocks. 97.It Cm density 98Set the density for the tape unit. For the density codes, see below. 99The density value could be given either numerically, or as a string, 100corresponding to the 101.Dq Reference 102field. If the string is abbreviated, it will be resolved in the order 103shown in the table, and the first matching entry will be used. If the 104given string and the resulting canonical density name do not match 105exactly, an informational message is printed about what the given 106string has been taken for. 107.It Cm eom 108Forward space to end of recorded medium 109(Count is ignored). 110.It Cm comp 111Set compression mode. 112(Not yet implemented.) 113.El 114.Pp 115If a tape name is not specified, and the environment variable 116.Ev TAPE 117does not exist; 118.Nm mt 119uses the device 120.Pa /dev/nrst0 . 121.Pp 122.Nm Mt 123returns a 0 exit status when the operation(s) were successful, 1241 if the command was unrecognized, and 2 if an operation failed. 125.Pp 126The different density codes are as follows: 127.Pp 128.Dl 0x0 default for device 129.Dl 0xE reserved for ECMA 130.Bd -literal -offset indent 131Value Tracks Density(bpi) Code Type Reference Note 1320x1 9 800 NRZI R X3.22-1983 2 1330x2 9 1600 PE R X3.39-1986 2 1340x3 9 6250 GCR R X3.54-1986 2 1350x5 4/9 8000 GCR C X3.136-1986 1 1360x6 9 3200 PE R X3.157-1987 2 1370x7 4 6400 IMFM C X3.116-1986 1 1380x8 4 8000 GCR CS X3.158-1986 1 1390x9 18 37871 GCR C X3B5/87-099 2 1400xA 22 6667 MFM C X3B5/86-199 1 1410xB 4 1600 PE C X3.56-1986 1 1420xC 24 12690 GCR C HI-TC1 1,5 1430xD 24 25380 GCR C HI-TC2 1,5 1440xF 15 10000 GCR C QIC-120 1,5 1450x10 18 10000 GCR C QIC-150 1,5 1460x11 26 16000 GCR C QIC-320(525?) 1,5 1470x12 30 51667 RLL C QIC-1350 1,5 1480x13 1 61000 DDS CS X3B5/88-185A 4 1490x14 1 43245 RLL CS X3.202-1991 4 1500x15 1 45434 RLL CS ECMA TC17 4 1510x16 48 10000 MFM C X3.193-1990 1 1520x17 48 42500 MFM C X3B5/91-174 1 153.Ed 154 155where Code means: 156.Bd -literal -offset indent 157NRZI Non Return to Zero, change on ones 158GCR Group Code Recording 159PE Phase Encoded 160IMFM Inverted Modified Frequency Modulation 161MFM Modified Frequency Modulation 162DDS Dat Data Storage 163RLL Run Length Encoding 164.Ed 165 166where Type means: 167.Bd -literal -offset indent 168R Reel-to-Reel 169C Cartridge 170CS cassette 171.Ed 172 173where Notes means: 174.Bd -literal -offset indent 1751 Serial Recorded 1762 Parallel Recorded 1773 Old format know as QIC-11 1784 Helical Scan 1795 Not ANSI standard, rather industry standard. 180.Ed 181 182.Sh ENVIRONMENT 183If the following environment variable exists, it is utilized by 184.Nm mt . 185.Bl -tag -width Fl 186.It Ev TAPE 187.Nm Mt 188checks the 189.Ev TAPE 190environment variable if the 191argument 192.Ar tapename 193is not given. 194.Sh FILES 195.Bl -tag -width /dev/rwt* -compact 196.It Pa /dev/rwt* 197Raw magnetic tape interface 198.It Pa /dev/*st[0-9]* 199SCSI magnetic tape interface 200.El 201.Sh SEE ALSO 202.\".Xr mtio 4 , 203.Xr st 4 , 204.\".Xr wt 4 , 205.Xr dd 1 , 206.Xr ioctl 2 , 207.Xr environ 7 208.Sh HISTORY 209The 210.Nm mt 211command appeared in 212.Bx 4.3 . 213 214Extensions regarding the 215.Xr st 4 216driver appeared in 386BSD 0.1 as a separate 217.Xr st 1 218command, and have been merged into the 219.Nm 220command in FreeBSD 2.1. 221.\" mt.1: mtio(4) missing 222.\" mt.1: wt(4) missing 223