dpkg-split(1) — Linux manual page


dpkg-split(1)                  dpkg suite                  dpkg-split(1)

NAME         top

       dpkg-split - Debian package archive split/join tool

SYNOPSIS         top

       dpkg-split [option...] command

DESCRIPTION         top

       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

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

       All splitting, joining and queueing operations produce
       informative messages on standard output; these may safely be

COMMANDS         top

       -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 decimal).

              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

       -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 output).

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

              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 complete-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-output 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

              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.

              Show the version and exit.

OPTIONS         top

       --depotdir directory
              Specifies an alternative directory for the queue of parts
              awaiting automatic reassembly. The default is

       -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 programs such as dpkg to cope with both
              split and unsplit packages without producing spurious

              Forces the output filenames generated by --split to be

              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
              filenames of the form prefixNofM.deb are generated.

EXIT STATUS         top

       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      Fatal or unrecoverable error due to invalid command-line
              usage, a file that looked like a package part file but was
              corrupted, or interactions with the system, such as
              accesses to the database, memory allocations, etc.

ENVIRONMENT         top

              Sets the color mode (since dpkg 1.18.5).  The currently
              accepted values are: auto (default), always and never.

              If set, it will be used as the timestamp (as seconds since
              the epoch) in the deb-split(5)'s ar(5) container.

FILES         top

              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         top

       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
       package part is one.

SEE ALSO         top

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

COLOPHON         top

       This page is part of the dpkg (Debian Package Manager) project.
       Information about the project can be found at 
       ⟨https://wiki.debian.org/Teams/Dpkg/⟩.  If you have a bug report
       for this manual page, see
       ⟨http://bugs.debian.org/cgi-bin/pkgreport.cgi?src=dpkg⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨https://salsa.debian.org/dpkg-team/dpkg.git⟩ on 2021-04-01.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2021-01-09.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

1.19.6-2-g6e42d5               2019-03-25                  dpkg-split(1)

Pages that refer to this page: deb-split(5)