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mdtar(1)							      mdtar(1)

Name
       mdtar - multivolume archiver

Syntax
       mdtar [key] [name...]

Description
       The  command  saves  multiple  files  on	 multiple archives (usually an
       RX50 diskette, but any file/device may be specified).  actions are con‐
       trolled	by  the	 key argument.	The key is a string of characters con‐
       taining one function letter and one or more function modifiers.	 Other
       arguments to are file or directory names specifying which files to dump
       or restore.  In all cases, appearance of a directory name refers to the
       files  and,  recursively, subdirectories of that directory.  also saves
       special files.

       This utility supports EOT handling which allows	the  use  of  multiple
       media.	The utility prompts for the next volume when it encounters the
       end of the current volume.

       This utility supports the TA90 style sequential stacker loader  device.
       The  device ejects a cartridge when it is taken off line.  This utility
       performs the device ejection on behalf of the user when it encounters a
       multivolume  boundary  during  write or read operations involving tape.
       The device then automatically loads the next available tape  (if	 there
       is one).	 The utility then attempts to access this next tape for a rea‐
       sonable amount of time (approximately three minutes)  before  prompting
       the user for a manual reload operation.

Options
       -C	 Changes  directory  to	 specified name.  This allows multiple
		 directories not related by  a	close  common  parent,	to  be
		 archived  using  short	 relative path names.  For example, to
		 archive files from and from one might use
		 mdtar c -C /usr include . -C /etc .

       The function portion of the key is specified by a letter.

       c	 Creates a new archive.	 Writing begins at  the	 beginning  of
		 the archive instead of after the last file.

       r	 Writes the named files to the end of the archive.

       t	 Generates  archive  table  of	contents.   If	no argument is
		 given, all of the names on the archive are listed.

       u	 Updates the current archive.  Adds the named files to the ar‐
		 chive,	 if  they  are	not there already or if they have been
		 modified since last put on the archive.

       x	 Extracts each specified file from the archive.	 If the	 named
		 file matches a directory whose contents had been written onto
		 the archive, this directory is	 recursively  extracted.   The
		 owner,	 modification  time,  and mode are restored if you are
		 the superuser and if you have also specified  the  p  switch.
		 If  no	 file argument is given, the entire content of the ar‐
		 chive is extracted.  If multiple entries specifying the  same
		 file  are  on	the  archive, the last one overwrites previous
		 versions.

       The following characters may be used to qualify the function desired in
       addition to one or more of the above letters.

       0...9	 Selects  unit number of the drive as an alternate disk drive.
		 The default disk drive is the device named

       A	 Uses the specified number (next  argument)  as	 archive  with
		 which to begin the output.  This switch is intended for error
		 recovery.  outputs files in terms of Archives.	 Each  Archive
		 contains  a  number of files. If has been requested to dump a
		 path (set of files) that consist of (for example) 10 archives
		 and  there  is	 an  error writing the nth Archive, then the A
		 modifier may be used to restart at the nth Archive.  You must
		 issue	the  same path (set of files) as in the first command.
		 This will guarantee that will begin at the  correct  file  on
		 Archive n.  If the v mode is specified, outputs informational
		 messages to inform the user of progress.   For	 example,  the
		 following command will dump the entire directory structure:
		 mdtar cv
		 If  an	 error	occurs on Archive 7, to restart at the 7th Ar‐
		 chive, without having to re-dump the first 6 Archives,	 issue
		 the following command:
		 mdtar cvA 7
		 will  tell  you  it is skipping the first 6 Archives and will
		 resume output with the data that begins Archive 7.

       b	 Uses the specified number (next  argument)  as	 the  blocking
		 factor.  The default is 20 (the maximum is 20).

       B	 Forces output blocking to 20 blocks per record.

       f	 Uses  the  specified  file (next argument) as the name of the
		 archive.  If the name of the file is -,  writes  to  standard
		 output (piping).

       F[fR]	 Operates  in  fast mode.  When F is specified, skips all SCCS
		 directories, core files, and errs files.  When FF  is	speci‐
		 fied, also skips all a.out and *.o files.

       h	 Saves	a  copy	 of  the  file (excludes symbolic links).  The
		 default action of is to place symbolic	 link  information  on
		 the  output  device.  A  copy of the file IS NOT saved on the
		 output device.

       i	 Ignores checksum errors found in the archive.

       l	 Displays an error message if all links to  the	 files	dumped
		 cannot be resolved. If -l is not specified, no error messages
		 are printed.

       L	 Permits the program to treat the tape drive as	 a  sequential
		 loader	 device	 even  though it is not represented as such in
		 the system driver tables.

       m	 Does not restore file modification times.   The  modification
		 time is the time of extraction.  Normally, restores modifica‐
		 tion times of regular and special files.

       o	 Suppresses the normal directory information.  On output, nor‐
		 mally places information specifying owner and modes of direc‐
		 tories in the archive.	 Former versions of when  encountering
		 this information will give the error message
		 <name>/: cannot create.

       p	 Restores  the	named  files to their original modes, ignoring
		 the present  Setuid  and  sticky  information	will  also  be
		 restored to the super-user.  You must be Superuser to perform
		 this option.  For further information, see S_ISVTX.

       s	 Uses specified number (next argument) as  size	 of  media  in
		 512-byte  blocks.   This  enables  to be used with devices of
		 different physical media sizes. The  default  is  800	blocks
		 (assumption is an RX50 output Archive).

       v	 Displays detailed (verbose) information as it archives files.
		 Normally does its work silently.  With the  t	function,  the
		 verbose  option  gives	 more  information  about  the archive
		 entries than just their names.
		 #cd
		 #mdtar cvf mdtar-out vmunix
		 Produces the output ``a vmunix 1490 blocks''  where  1490  is
		 the number of 512 byte blocks in the file ``vmunix''.
		 #mdtar xvf mdtar-out
		 Produces  the	output ``x vmunix, 762880 bytes, 1490 blocks''
		 where 762880 is the number of bytes and 1490 is the number of
		 512 byte blocks in the file ``vmunix'' which was extracted.

       w	 Displays  action  to  be  taken for each file and prompts for
		 confirmation.	If a word beginning with  `y'  is  given,  the
		 action is done. Any other input means do not do it.

Restrictions
       The u option can be slow.

       The current limit on file name length is 100 characters.

       There is no way to follow symbolic links selectively.

       On SCSI tape devices tar (when reading) may end on one volume of a mul‐
       tivolume set without prompting for the next  volume.  This  is  a  very
       infrequent  condition. The next volume should be loaded and the command
       issued again.

       Using a blocking factor other than the default (b option) may  lead  to
       higher  performance.  However, you must select a value that is compati‐
       ble with	 the  hardware	limitations  of	 the  source  and  destination
       machines.  Software limitations may apply for other versions of

       When extracting (x), reads the entire tape. See the r and u keys.

       The  u  and  the	 r function keys do not operate with quarter-inch tape
       cartidge drives such as the TZK10.

       ULTRIX due to BSD coding, does not completely fill a flexible  disc  in
       multivolume situations.

       In  multivolulme	 situations, ULTRIX employs the following header rules
       for volume-spanning files.  At the beginning of the next volume, a sec‐
       ond  header is written that includes both the full size of the file and
       the size of the file segment that is written on the second volume.  The
       first  header  states  the full size of the file only.  These rules may
       not be compatible with other systems' versions of

Diagnostics
       Indicates bad key characters and archive read/write errors.

       Indicates if enough memory is not available to hold the link tables.

Files
See Also
       stat(2), tar(1)

								      mdtar(1)
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