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mt-dds



SYNOPSIS

       mt-dds comp-on|comp-off|comp-query|comp-log
       mt-dds < tell|label > [ -b  # ]


DESCRIPTION

       mt-dds  controls  the compression mode of dds tape devices
       (DAT).

       mt-dds may also report the current tape position in  abso­
       lute  records (relative to begin of tape) in a format that
       may be used later by dds2tar(1)  to  access  tar  archives
       that are not the first file on tape.

       The  default  device is /dev/rmt0, which may be overridden
       with the environment variable TAPE, which in turn  may  be
       overridden with the -f device option. The device must be a
       character special file.


OPTIONS

   DDS tape device control options
       comp-on
              Enable the hardware compression mode  if  supported
              by the device.

       comp-off
              Disable  the  compression  mode,  switch  to normal
              mode.

       comp-query
              Print to stderr if compression  mode  currently  is
              disabled or enabled.  A 0 means compression is dis­
              abled, a 1 means compression in enabled.

       comp-log
              Print to stdout four  lines  of  information  about
              transferred  kilobytes  before  and  after hardware
              compression from and to the device  since  initial­
              ization.

   dds2tar service functions
       tell   Print three lines with the current tape position, a
              block size value (20 by default, may be  overridden
              with  -b  option)  and a block length value (block­
              size*512) to stdout.  If this output is  redirected
              to  a  location file locfile, this file may be used
              by dds2tar(1) to access archives on tape.

       label  If the current tape position is the beginning of an
              archive  and  the archive is labeled, mt-dds writes
              the label to stdout and moves the tape back to  the
              current position (or back over the filemark).

              the archive or a larger number.

   other options
       -f device
              Device  of the tape archive (default is /dev/rmt0).
              Must be a character special file connected to a dds
              tape device.

       -V,--version
              Print  the  version  number of mt-dds to stderr and
              exit immediately.

       --help print some screens of  online  help  with  examples
              through a pager and exit immediately.


EXAMPLES

       Example  1:  checking  the compression mode of the default
       tape device
                 mt-dds comp-query

       Example 2: Write the location information as dds2tar  com­
       mand line options to stdout.
                 mt-dds


ENVIRONMENT

       The  environment  variable TAPE overrides the default tape
       device /dev/rmt0.

       PAGER  The  environment  variable  PAGER   overrides   the
              builtin  pager command ("/bin/more") to display the
              output of the --help option.


SEE ALSO

       dds2tar(1), dds2index(1), mt(1), tar(1)


HISTORY

       This program was created to use  it  in  conjunction  with
       dds2tar.


AUTHOR

       J"org  Weule  (weule@cs.uni-duesseldorf.de), Phone +49 211
       751409.  This software is  available  at  ftp.uni-duessel­
       dorf.de:/pub/unix/apollo

                               2.4                     mt-dds(1L)

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