sbin/st/st.8

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.\"     @(#)mt.1        6.7 (Berkeley) 7/28/91
.\"
.Dd July 28, 1991
.Dt ST 1
.Os BSD 4
.Sh NAME
.Nm st
.Nd magnetic tape manipulating program
.Sh SYNOPSIS
.Nm st
.Op Fl f Ar tapename
.Ar command
.Op Ar count
.Sh DESCRIPTION
.Nm St
is used to give commands to a magnetic tape drive.
By default
.Nm st
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.
.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 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
(Count is ignored).
.It Cm offline , rewoffl
Rewind the tape and place the tape unit off-line
(Count is ignored).
.It Cm blocksize
Sets the block size characteristics of the device to value specified in
.Ar count.
A 0 means variable sized blocks, and anything else means fixed block,
with blocksize as that of
.Ar count.
.It Cm high_dnsty
Set the default high density minor device
.Ar count
density code as specified by the SCSI II specification. Valid values
are from 0  to 0x17.
.It Cm medium_dnsty
Set the default medium density minor device
.Ar count
density code as specified by the SCSI II specification. Valid values
are from 0  to 0x17.
.It Cm low_dnsty
Set the default low density minor device
.Ar count
density code as specified by the SCSI II specification. Valid values
are from 0  to 0x17.
.It The different density codes are as follows:
0x0     default for device
.br
0xE     reserved for ECMA
.br

Value Tracks Density(bpi) Code Type  Reference     Note
.br
0x1     9       800       NRZI  R    X3.22-1983    2
.br
0x2     9      1600       PE    R    X3.39-1986    2
.br
0x3     9      6250       GCR   R    X3.54-1986    2
.br
0x5    4/9     8000       GCR   C    X3.136-1986   1
.br
0x6     9      3200       PE    R    X3.157-1987   2
.br
0x7     4      6400       IMFM  C    X3.116-1986   1
.br
0x8     4      8000       GCR   CS   X3.158-1986   1
.br
0x9    18     37871       GCR   C    X3B5/87-099   2
.br
0xA    22      6667       MFM   C    X3B5/86-199   1
.br
0xB     4      1600       PE    C    X3.56-1986    1
.br
0xC    24     12690       GCR   C    HI-TC1        1,5
.br
0xD    24     25380       GCR   C    HI-TC2        1,5
.br
0xF    15     10000       GCR   C    QIC-120       1,5
.br
0x10   18     10000       GCR   C    QIC-150       1,5
.br
0x11   26     16000       GCR   C    QIC-320(525?) 1,5
.br
0x12   30     51667       RLL   C    QIC-1350      1,5
.br
0x13    1     61000       DDS   CS    X3B5/88-185A 4
.br
0x14    1     43245       RLL   CS    X3.202-1991  4
.br
0x15    1     45434       RLL   CS    ECMA TC17    4
.br
0x16   48     10000       MFM   C     X3.193-1990  1
.br
0x17   48     42500       MFM   C     X3B5/91-174  1
.br

where Code means:
.br
NRZI    Non Return to Zero, change on ones
.br
GCR     Group Code Recording
.br
PE      Phase Encoded
.br
IMFM    Inverted Modified Frequency Modulation
.br
MFM     Modified Frequency Modulation
.br
DDS     Dat Data Storage
.br
RLL     Run Length Encoding
.br

where Type means:
.br
R       Real-to-Real
.br
C       Cartridge
.br
CS      cassette
.br

where Notes means:
.br
1       Serial Recorded
.br
2       Parallel Recorded
.br
3       Old format know as QIC-11
.br
4       Helical Scan
.br
5       Not ANSI standard, rather industry standard.
.br

.It Cm status
Print status information about the tape unit.
.El
.Pp
If a tape name is not specified, and the environment variable
.Ev TAPE
does not exist;
.Nm st
uses the device
.Pa /dev/rmt12 .
.Pp
.Nm St
returns a 0 exit status when the operation(s) were successful,
1 if the command was unrecognized, and 2 if an operation failed.
.Sh ENVIRONMENT
If the following environment variable exists, it is utilized by
.Nm st .
.Bl -tag -width Fl
.It Ev TAPE
.Nm St
checks the
.Ev TAPE
environment variable if the
argument
.Ar tapename
is not given.
.Sh FILES
.Bl -tag -width /dev/rmt* -compact
.It Pa /dev/rmt*
Raw magnetic tape interface
.El
.Sh SEE ALSO
.\".Xr mtio 4 ,
.Xr dd 1 ,
.Xr ioctl 2 ,
.Xr environ 7
.Sh HISTORY
The
.Nm st
command appeared in 386BSD 0.1.

.\" mt.1: mtio(4) missing