1MT(1)                       General Commands Manual                      MT(1)
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NAME

6       mt - magnetic tape manipulating program
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SYNOPSIS

9       mt [ -f tapename ] command [ count ]
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DESCRIPTION

12       Mt  is  used to give commands to a magnetic tape drive.  If a tape name
13       is not specified, the environment variable TAPE is used;  if TAPE  does
14       not exist, mt uses the device /dev/rmt12.  Note that tapename must ref‐
15       erence a raw (not block) tape  device.   By  default  mt  performs  the
16       requested  operation  once.  Operations may be performed multiple times
17       by specifying count.
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19       The available commands are listed below.  Only as  many  characters  as
20       are required to uniquely identify a command need be specified.
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22       eof, weof
23              Write  count  end-of-file  marks  at the current position on the
24              tape.
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26       fsf    Forward space count files.
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28       fsr    Forward space count records.
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30       bsf    Back space count files.
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32       bsr    Back space count records.
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34       rewind Rewind the tape (Count is ignored).
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36       offline, rewoffl
37              Rewind the tape and place  the  tape  unit  off-line  (Count  is
38              ignored).
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40       status Print status information about the tape unit.
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42       cacheon
43              Enable the readahead/writebehind cache on the tape unit.
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45       cacheoff
46              Turn off the readahead/writebehind cache on the tape unit.
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48       Mt  returns a 0 exit status when the operation(s) were successful, 1 if
49       the command was unrecognized, and 2 if an operation failed.
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51       The cacheon and cacheoff commands currently only  apply  to  the  TMSCP
52       driver and then only for certain drives such as the TU81+.  No error is
53       produced by the TMSCP driver if the cache  commands  are  used.   Other
54       drivers  will  return  an  error  code  since they do not recognize the
55       MTCACHE and MTNOCACHE functions codes.  See mtio(4).
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FILES

58       /dev/rmt* Raw magnetic tape interface
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SEE ALSO

61       mtio(4), tmscp(4), dd(1), ioctl(2), environ(7)
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654th Berkeley Distribution      December 22, 1995                         MT(1)
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