119 lines
3.8 KiB
Groff
119 lines
3.8 KiB
Groff
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MT(1) Minix Programmer's Manual MT(1)
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NAME
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mt - magnetic tape control
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SYNOPSIS
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mt [-f device] [count]
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DESCRIPTION
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Mt is a user interface to the magnetic tape commands described in
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mtio(4). It allows one to space a tape forwards or backwards, write end
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of file markers, etc.
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With the -f option a tape device can be named, otherwise the environment
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variable TAPE is used if set, otherwise the default device /dev/nrst4 is
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assumed. Standard input is used if the tape name is a dash (-). The
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count argument is used to tell how many blocks or files to space or how
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many file markers to write. It may be a C-style decimal, octal or
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hexadecimal constant, by default "1".
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Command is the action to perform, it may be one of the following, or any
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unambiguous prefix (like st for status):
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eof, weof Write count end-of-file markers.
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fsf Forward space count file markers.
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fsr Forward space count records. (The size of a record
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depends on the tape, and may even be variable, depending
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on the size of the writes.)
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bsf Backwards space count files. The count may be zero to
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backspace to the start of the current file. (A tape
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device need not support backwards movement, or may be very
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slow doing it. Rewinding and forward spacing may be
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better.)
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bsr Backwards space count records. The tape is positioned
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after the last block of the previous file if you hit a
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filemark when spacing backwards. The block count is set
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to -1 to indicate that the driver has no idea where it is
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on the previous file.
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eom Forward space to the end of media.
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rewind Rewind the tape.
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offline, rewoffl
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Rewind and take offline. This may cause some drives to
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eject the tape.
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1
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MT(1) Minix Programmer's Manual MT(1)
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status Shows the status of the drive, the sense key of the last
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SCSI error, current file number, current record number,
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residual count if the last command that encountered end-
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of-file, and the current block size.
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retension Removes tape tension by winding and rewinding the tape
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completely.
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erase Erases the tape completely and rewinds it.
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density Sets the density code to read or write the tape to count.
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Density codes supported depend on the drive. This command
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need not be used if the drive senses the proper density on
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read and can only write one density.
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blksize, blocksize
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Sets the block size used to read or write the tape to
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count. This command may be used to select a fixed block
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size for a variable block size tape. This will speed up
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I/O for small block sizes. Use a zero count to use
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variable sized blocks again.
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ENVIRONMENT
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TAPE Tape drive to use if set.
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FILES
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/dev/nrst4 Default tape device.
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SEE ALSO
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mtio(4), st(4).
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AUTHOR
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Kees J. Bot (kjb@cs.vu.nl)
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