The  multi-part  .deb format is used to split big packages into smaller
       pieces to ease transport in small media.

       The file is an ar archive with a magic  value  of  !<arch>.   The  file
       names might contain a trailing slash (since dpkg 1.15.6).

       The  first member is named debian-split and contains a series of lines,
       separated by newlines. Currently eight lines are present:

       o   The format version number, 2.1 at the time  this  manual  page  was

       o   The package name.

       o   The package version.

       o   The md5sum of the package.

       o   The total size of the package.

       o   The maximum part size.

       o   The  current  part number, followed by a slash and the total amount
           of parts (as in '1/10').

       o   The package architecture (since dpkg 1.16.1).

       Programs which read multi-part archives  should  be  prepared  for  the
       minor  format version number to be increased and additional lines to be
       present, and should ignore these if this is the case.

       If the major format version number has changed, an incompatible  change
       has been made and the program should stop. If it has not, then the pro-
       gram should be able to safely continue, unless it encounters  an  unex-
       pected member in the archive (except at the end), as described below.

       The  second,  last required member is named data.N, where N denotes the
       part number. It contains the raw part data.

       These members must occur in this exact order.  Current  implementations
       should ignore any additional members after data.N.  Further members may
       be defined in the future, and (if possible) will be placed after  these

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