dpkg-split man page on ElementaryOS

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dpkg-split(1)			dpkg utilities			 dpkg-split(1)

NAME
       dpkg-split - Debian package archive split/join tool

SYNOPSIS
       dpkg-split [option...] command

DESCRIPTION
       dpkg-split  splits  Debian  binary package files into smaller parts and
       reassembles them again, to support the storage of large	package	 files
       on small media such as floppy disks.

       It  can	be  operated  manually	using  the  --split, --join and --info
       options.

       It also has an automatic mode, invoked using the --auto	option,	 where
       it maintains a queue of parts seen but not yet reassembled and reassem‐
       bles a package file when it has seen all of its parts. The --listq  and
       --discard options allow the management of the queue.

       All splitting, joining and queueing operations produce informative mes‐
       sages on standard output; these may safely be ignored.

COMMANDS
       -s, --split complete-archive [prefix]
	      Splits a single Debian binary package into several parts.

	      The parts are named prefix.NofM.deb where N is the part  number,
	      starting at 1, and M is the total number of parts (both in deci‐
	      mal).

	      If no prefix is supplied then the complete-archive  filename  is
	      taken, including directory, with any trailing .deb removed.

       -j, --join part...
	      Joins  the  parts	 of  a package file together, reassembling the
	      original file as it was before it was split.

	      The part files given as arguments	 must  be  all	the  parts  of
	      exactly  the  same  original  binary  file. Each part must occur
	      exactly once in the argument list, though the parts to not  need
	      to be listed in order.

	      The  parts  must of course all have been generated with the same
	      part size specified at split time, which means  that  they  must
	      usually have been generated by the same invocation of dpkg-split
	      --split.

	      The parts' filenames are	not  significant  for  the  reassembly
	      process.

	      By default the output file is called package_version_arch.deb.

       -I, --info part...
	      Prints  information,  in a human-readable format, about the part
	      file(s) specified. Arguments which are not binary package	 parts
	      produce  a message saying so instead (but still on standard out‐
	      put).

       -a, --auto -o complete-output part
	      Automatically queue parts and reassemble a package if possible.

	      The part specified is examined, and compared with other parts of
	      the same package (if any) in the queue of packages file parts.

	      If  all  parts  of  the package file of which part is a part are
	      available then the package is reassembled and  written  to  com‐
	      plete-output  (which  should  not	 usually already exist, though
	      this is not an error).

	      If not then the part is copied into the queue and	 complete-out‐
	      put is not created.

	      If  part is not a split binary package part then dpkg-split will
	      exit with status 1; if some other trouble occurs	then  it  will
	      exit with status 2.

	      The  --output  or	 -o option must be supplied when using --auto.
	      (If this were not mandatory the calling program would  not  know
	      what output file to expect.)

       -l, --listq
	      Lists the contents of the queue of packages to be reassembled.

	      For each package file of which parts are in the queue the output
	      gives the name of the package, the parts in the queue,  and  the
	      total number of bytes stored in the queue.

       -d, --discard [package...]
	      This  discards  parts  from  the	queue of those waiting for the
	      remaining parts of their packages.

	      If no package is specified then the queue is cleared completely;
	      if  any are specified then only parts of the relevant package(s)
	      are deleted.

       -?, --help
	      Show the usage message and exit.

       --version
	      Show the version and exit.

OPTIONS
       --depotdir directory
	      Specifies an alternative directory for the queue of parts await‐
	      ing automatic reassembly. The default is /var/lib/dpkg.

       -S, --partsize kibibytes
	      Specifies	 the  maximum  part  size when splitting, in kibibytes
	      (1024 bytes). The default is 450 KiB.

       -o, --output complete-output
	      Specifies the output file name for a reassembly.

	      This overrides the default for a manual reassembly (--join)  and
	      is mandatory for an automatic queue-or-reassemble (--auto).

       -Q, --npquiet
	      When  doing  automatic  queue-or-reassembly  dpkg-split  usually
	      prints a message if it is given a part  that  is	not  a	binary
	      package part. This option suppresses this message, to allow pro‐
	      grams such as dpkg to cope with both split and unsplit  packages
	      without producing spurious messages.

       --msdos
	      Forces  the  output  filenames generated by --split to be msdos-
	      compatible.

	      This mangles the prefix - either the default  derived  from  the
	      input filename or the one supplied as an argument: alphanumerics
	      are lowercased, plus signs are replaced by  x's  and  all	 other
	      characters are discarded.

	      The  result is then truncated as much as is necessary, and file‐
	      names of the form prefixNofM.deb are generated.

EXIT STATUS
       0      The requested split, merge, or other command succeeded.	--info
	      commands	count  as  successful even if the files are not binary
	      package parts.

       1      Only occurs with --auto and indicates that the part file was not
	      a binary package part.

       2      Some  kind of trouble happened, such as a system call failure, a
	      file that looked like a package part file but was	 corrupted,  a
	      usage error or some other problem.

FILES
       /var/lib/dpkg/parts
	      The  default  queue  directory for part files awaiting automatic
	      reassembly.

	      The filenames used in this directory are in a format internal to
	      dpkg-split  and are unlikely to be useful to other programs, and
	      in any case the filename format should not be relied upon.

BUGS
       Full details of the packages in the queue are impossible to get without
       digging into the queue directory yourself.

       There  is no easy way to test whether a file that may be a binary pack‐
       age part is one.

SEE ALSO
       deb(5), deb-control(5), dpkg-deb(1), dpkg(1).

Debian Project			  2011-07-04			 dpkg-split(1)
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