Notes about Debian 7-Zip packages.
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The Debian 7-Zip suite consists of the three following packages:

1. p7zip package, which is the smallest one and includes:

    - 7zr command, which provides support for compressing and
      decompressing archives in 7-Zip, LZMA and XZ formats only.

      *Note*: the 7zr command cannot be used on archives protected
      by passwords, those are supported by 7za and 7z commands
      from the p7zip-full package.

    - p7zip script which is a gzip-like wrapper on 7zr or 7za
      commands.

2. p7zip-full package that depends on the above p7zip package
   and consists of:

    - 7za command which is standalone command line version of 7-Zip.
      It supports more archive formats than 7zr.

    - 7z command which is the full featured command line version of
      7-Zip. 7z uses other modules from 7-Zip package, so it handles
      more archive formats, but might be a bit slower than 7za.
      Modules are installed in /usr/lib/p7zip.

    - Small additional documentation in the HTML format.

3. Non-free p7zip-rar package that contains non-free (due to the terms
   of the UnRAR license) Rar.so module for the 7z command.

Note concerning directory exclusion.
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 - Directory exclusion only works when an exclude list file is provided
   and if directories to exclude are listed as relative paths of the
   location 7z or 7za is run from.

 - Using absolute directories *won't* work, as noted in #296665.