| [9] | 1 | .TH MT 1
|
|---|
| 2 | .SH NAME
|
|---|
| 3 | mt \- magnetic tape control
|
|---|
| 4 | .SH SYNOPSIS
|
|---|
| 5 | .B mt
|
|---|
| 6 | .RB [ \-f
|
|---|
| 7 | .IR device ]
|
|---|
| 8 | .RI [ count ]
|
|---|
| 9 | .SH DESCRIPTION
|
|---|
| 10 | .B Mt
|
|---|
| 11 | is a user interface to the magnetic tape commands described in
|
|---|
| 12 | .BR mtio (4).
|
|---|
| 13 | It allows one to space a tape forwards or backwards, write end of file
|
|---|
| 14 | markers, etc.
|
|---|
| 15 | .PP
|
|---|
| 16 | With the
|
|---|
| 17 | .B \-f
|
|---|
| 18 | option a tape device can be named, otherwise the environment variable
|
|---|
| 19 | .B TAPE
|
|---|
| 20 | is used if set. Standard input is used if the tape name is a dash (\-). The
|
|---|
| 21 | .I count
|
|---|
| 22 | argument is used to tell how many blocks or files to space or how many file
|
|---|
| 23 | markers to write. It may be a C-style decimal, octal or hexadecimal constant,
|
|---|
| 24 | by default "1".
|
|---|
| 25 | .PP
|
|---|
| 26 | .I Command
|
|---|
| 27 | is the action to perform, it may be one of the following, or any
|
|---|
| 28 | unambiguous prefix (like
|
|---|
| 29 | .B st
|
|---|
| 30 | for
|
|---|
| 31 | .BR status ):
|
|---|
| 32 | .TP 15
|
|---|
| 33 | .B eof, weof
|
|---|
| 34 | Write
|
|---|
| 35 | .I count
|
|---|
| 36 | end-of-file markers.
|
|---|
| 37 | .TP
|
|---|
| 38 | .B fsf
|
|---|
| 39 | Forward space
|
|---|
| 40 | .I count
|
|---|
| 41 | file markers.
|
|---|
| 42 | .TP
|
|---|
| 43 | .B fsr
|
|---|
| 44 | Forward space
|
|---|
| 45 | .I count
|
|---|
| 46 | records. (The size of a record depends on the tape, and may even be
|
|---|
| 47 | variable, depending on the size of the writes.)
|
|---|
| 48 | .TP
|
|---|
| 49 | .B bsf
|
|---|
| 50 | Backwards space
|
|---|
| 51 | .I count
|
|---|
| 52 | files. The count may be zero to backspace to the start of the current file.
|
|---|
| 53 | (A tape device need not support backwards movement, or may be very slow
|
|---|
| 54 | doing it. Rewinding and forward spacing may be better.)
|
|---|
| 55 | .TP
|
|---|
| 56 | .B bsr
|
|---|
| 57 | Backwards space
|
|---|
| 58 | .I count
|
|---|
| 59 | records. The tape is positioned after the last block of the previous file
|
|---|
| 60 | if you hit a filemark when spacing backwards. The block count is set to -1
|
|---|
| 61 | to indicate that the driver has no idea where it is on the previous file.
|
|---|
| 62 | .TP
|
|---|
| 63 | .B eom
|
|---|
| 64 | Forward space to the end of media.
|
|---|
| 65 | .TP
|
|---|
| 66 | .B rewind
|
|---|
| 67 | Rewind the tape.
|
|---|
| 68 | .TP
|
|---|
| 69 | .B offline, rewoffl
|
|---|
| 70 | Rewind and take offline. This may cause some drives to eject the tape.
|
|---|
| 71 | .TP
|
|---|
| 72 | .B status
|
|---|
| 73 | Shows the status of the drive, the sense key of the last SCSI error,
|
|---|
| 74 | current file number, current record number, residual count if the last
|
|---|
| 75 | command that encountered end-of-file, and the current block size.
|
|---|
| 76 | .TP
|
|---|
| 77 | .B retension
|
|---|
| 78 | Removes tape tension by winding and rewinding the tape completely.
|
|---|
| 79 | .TP
|
|---|
| 80 | .B erase
|
|---|
| 81 | Erases the tape completely and rewinds it.
|
|---|
| 82 | .TP
|
|---|
| 83 | .B density
|
|---|
| 84 | Sets the density code to read or write the tape to
|
|---|
| 85 | .IR count .
|
|---|
| 86 | Density codes supported depend on the drive. This command need not be
|
|---|
| 87 | used if the drive senses the proper density on read and can only write
|
|---|
| 88 | one density.
|
|---|
| 89 | .TP
|
|---|
| 90 | .B blksize, blocksize
|
|---|
| 91 | Sets the block size used to read or write the tape to
|
|---|
| 92 | .IR count .
|
|---|
| 93 | This command may be used to select a fixed block size for a variable block
|
|---|
| 94 | size tape. This will speed up I/O for small block sizes. Use a zero
|
|---|
| 95 | .I count
|
|---|
| 96 | to use variable sized blocks again.
|
|---|
| 97 | .SH ENVIRONMENT
|
|---|
| 98 | .TP 15n
|
|---|
| 99 | .B TAPE
|
|---|
| 100 | Tape drive to use if set.
|
|---|
| 101 | .SH FILES
|
|---|
| 102 | .TP 15n
|
|---|
| 103 | .B /dev/nrst4
|
|---|
| 104 | Default tape device.
|
|---|
| 105 | .SH "SEE ALSO"
|
|---|
| 106 | .BR mtio (4),
|
|---|
| 107 | .BR st (4).
|
|---|
| 108 | .SH AUTHOR
|
|---|
| 109 | Kees J. Bot (kjb@cs.vu.nl)
|
|---|
