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@(#)mt.1 8.1 (Berkeley) 6/6/93
.Dd June 6, 1993 .Dt MT 1 .Os BSD 4 .Sh NAME .Nm mt .Nd magnetic tape manipulating program .Sh SYNOPSIS .Nm .Op Fl f Ar tapename .Ar command .Op Ar count .Sh DESCRIPTION .Nm Mt 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 . Note that .Ar tapename must reference a raw (not block) tape device.
p The available commands are listed below. Only as many characters as are required to uniquely identify a command need be specified. l -tag -width "eof, weof" t Cm weof Write .Ar count end-of-file marks at the current position on the tape. t Cm fsf Forward space .Ar count files. t Cm fsr Forward space .Ar count records. t Cm bsf Back space .Ar count files. t Cm bsr Back space .Ar count records. t Cm rewind Rewind the tape (Count is ignored). t Cm offline , rewoffl Rewind the tape and place the tape unit off-line (Count is ignored). t Cm erase Erase the tape (Count is ignored). t Cm retension Re-tension the tape (one full wind forth and back, Count is ignored). t Cm status Print status information about the tape unit. t Cm blocksize Set the block size for the tape unit. Zero means variable-length blocks. t Cm density Set the density for the tape unit. For the density codes, see below. The density value could be given either numerically, or as a string, corresponding to the .Dq Reference field. If the string is abbreviated, it will be resolved in the order shown in the table, and the first matching entry will be used. If the given string and the resulting canonical density name do not match exactly, an informational message is printed about what the given string has been taken for. t Cm eom Forward space to end of recorded medium (Count is ignored). t Cm comp Set compression mode. (Not yet implemented.) .El
p If a tape name is not specified, and the environment variable .Ev TAPE does not exist; .Nm uses the device
p .Nm Mt returns a 0 exit status when the operation(s) were successful, 1 if the command was unrecognized, and 2 if an operation failed.
p The different density codes are as follows:
p
.Dl 0x0 default for device
.Dl 0xE reserved for ECMA
d -literal -offset indent Value Tracks Density(bpi) Code Type Reference Note
0x1 9 800 NRZI R X3.22-1983 2
0x2 9 1600 PE R X3.39-1986 2
0x3 9 6250 GCR R X3.54-1986 2
0x5 4/9 8000 GCR C X3.136-1986 1
0x6 9 3200 PE R X3.157-1987 2
0x7 4 6400 IMFM C X3.116-1986 1
0x8 4 8000 GCR CS X3.158-1986 1
0x9 18 37871 GCR C X3B5/87-099 2
0xA 22 6667 MFM C X3B5/86-199 1
0xB 4 1600 PE C X3.56-1986 1
0xC 24 12690 GCR C HI-TC1 1,5
0xD 24 25380 GCR C HI-TC2 1,5
0xF 15 10000 GCR C QIC-120 1,5
0x10 18 10000 GCR C QIC-150 1,5
0x11 26 16000 GCR C QIC-320(525?) 1,5
0x12 30 51667 RLL C QIC-1350 1,5
0x13 1 61000 DDS CS X3B5/88-185A 4
0x14 1 43245 RLL CS X3.202-1991 4
0x15 1 45434 RLL CS ECMA TC17 4
0x16 48 10000 MFM C X3.193-1990 1
0x17 48 42500 MFM C X3B5/91-174 1
.Ed
where Code means:
d -literal -offset indent NRZI Non Return to Zero, change on ones
GCR Group Code Recording
PE Phase Encoded
IMFM Inverted Modified Frequency Modulation
MFM Modified Frequency Modulation
DDS Dat Data Storage
RLL Run Length Encoding
.Ed
where Type means:
d -literal -offset indent R Reel-to-Reel
C Cartridge
CS cassette
.Ed
where Notes means:
d -literal -offset indent 1 Serial Recorded
2 Parallel Recorded
3 Old format know as QIC-11
4 Helical Scan
5 Not ANSI standard, rather industry standard.
.Ed
.Sh ENVIRONMENT
If the following environment variable exists, it is utilized by
.Nm mt .
l -tag -width Fl t Ev TAPE .Nm Mt
checks the
.Ev TAPE
environment variable if the
argument
.Ar tapename
is not given.
.Sh FILES
l -tag -width /dev/rwt* -compact t Pa /dev/rwt* Raw magnetic tape interface
t Pa /dev/*st[0-9]* SCSI magnetic tape interface
.El
.Sh SEE ALSO
.Xr mtio 4 ,
.Xr st 4 ,
.Xr wt 4 ,
.Xr dd 1 ,
.Xr ioctl 2 ,
.Xr environ 7
.Sh HISTORY
The
.Nm
command appeared in
x 4.3 .
Extensions regarding the
.Xr st 4
driver appeared in 386BSD 0.1 as a separate
.Xr st 1
command, and have been merged into the
.Nm
command in
.Fx 2.1 .
mt.1: mtio(4) missing
mt.1: wt(4) missing