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mt-dds(1) [debian man page]

mt-dds(1)						      General Commands Manual							 mt-dds(1)

NAME

       mt-dds - tool to control a dds device.

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 absolute 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/nst0, 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 disabled, 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 initialization.

   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 (blocksize*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).

       ts     If the current tape position is the beginning of an archive and the archive is labeled, mt-dds writes the timestamp in octal  format
	      to  stdout  and  moves  the  tape back to the current position (or back over the filemark).  If you are using only one computer, the
	      timestamp can be used as a unique archive identifier.

       -b #   Specify the block size # value that is used as a default for the written value with the mt-dds tell command (see above).	 Also  the
	      internal	buffer	size  is  specified with this option which is used to read one block in order to get the block size of the current
	      tape block. So specify the block size of the archive or a larger number.

   other options
       -f device
	      Device of the tape archive (default is /dev/nst0).  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 command line options to stdout.
		 mt-dds

ENVIRONMENT

       The environment variable TAPE overrides the default tape device /dev/nst0.

       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-duesseldorf.de:/pub/unix/apollo

									2.4								 mt-dds(1)

Check Out this Related Man Page

MT(1)							      General Commands Manual							     MT(1)

NAME

       mt - control magnetic tape drive operation

SYNOPSIS

       mt [-V] [-f device] [--file=device] [--rsh-command=command] [--version] operation [count]

DESCRIPTION

       This  manual page documents the GNU version of mt.  mt performs the given operation, which must be one of the tape operations listed below,
       on a tape drive.

       The default tape device to operate on is taken from the file /usr/include/sys/mtio.h when mt is compiled.  It can be overridden by giving a
       device file name in the environment variable TAPE or by a command line option (see below), which also overrides the environment variable.

       The  device  must  be either a character special file or a remote tape drive.  To use a tape drive on another machine as the archive, use a
       filename that starts with `HOSTNAME:'.  The hostname can be preceded by a username and an `@' to access the remote tape drive as that user,
       if you have permission to do so (typically an entry in that user's `~/.rhosts' file).

       The available operations are listed below.  Unique abbreviations are accepted.  Not all operations are available on all systems, or work on
       all types of tape drives.  Some operations optionally take a repeat count, which can be given after the operation name and defaults to 1.

       eof, weof
	      Write count EOF marks at current position.

       fsf    Forward space count files.  The tape is positioned on the first block of the next file.

       bsf    Backward space count files.  The tape is positioned on the first block of the next file.

       fsr    Forward space count records.

       bsr    Backward space count records.

       bsfm   Backward space count file marks.	The tape is positioned on the beginning-of-the-tape side of the file mark.

       fsfm   Forward space count file marks.  The tape is positioned on the beginning-of-the-tape side of the file mark.

       asf    Absolute space to file number count.  Equivalent to rewind followed by fsf count.

       seek   Seek to block number count.

       eom    Space to the end of the recorded media on the tape (for appending files onto tapes).

       rewind Rewind the tape.

       offline, rewoffl
	      Rewind the tape and, if applicable, unload the tape.

       status Print status information about the tape unit.

       retension
	      Rewind the tape, then wind it to the end of the reel, then rewind it again.

       erase  Erase the tape.

       mt exits with a status of 0 if the operation succeeded, 1 if the operation or device name given was invalid, or 2 if the operation failed.

   OPTIONS
       -f, --file=device
	      Use device as the file name of the tape drive to operate on.  To use a tape drive on another machine, use  a  filename  that  starts
	      with  `HOSTNAME:'.   The hostname can be preceded by a username and an `@' to access the remote tape drive as that user, if you have
	      permission to do so (typically an entry in that user's `~/.rhosts' file).

       --rsh-command=command
	      Notifies mt that it should use command to communicate with remote devices instead of /usr/bin/ssh or /usr/bin/rsh.

       -V, --version
	      Print the version number of mt.

REPORTING BUGS

       Report cpio bugs to bug-cpio@gnu.org

       GNU cpio home page: <http://www.gnu.org/software/cpio/>

       General help using GNU software: <http://www.gnu.org/gethelp/>

       Report cpio translation bugs to <http://translationproject.org/team/>

																	     MT(1)
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