NTFSUSERMAP(8)           (February 2016)           NTFSUSERMAP(8)

          ntfsusermap - NTFS Building a User Mapping File

          ntfsusermap windows-system-device [other-ntfs-device...]

          Where windows-system-device is the device containing the
          Windows system whose users are to be mapped to current Linux

          And other-ntfs-device is another device containing files
          which are to be accessed both by the Windows mentioned above
          and current Linux system.

          the ntfsusermap command must be started as root, and the
          designated devices must not be mounted.

          Typing ntfsusermap with no args will display a summary of
          command arguments.

          ntfsusermap creates the file defining the mapping of Windows
          accounts to Linux logins for users who owns files which
          should be visible from both Windows and Linux.

          It relies on existing files which were created on Windows,
          trying to locate significant files and asking which Linux
          user or group should own them. When a Linux owner or group
          is requested, the reply may be :

          - the uid or gid (numeric or symbolic) of Linux owner or
          group of the file.
               In that situation, no more file with the same Windows
               owner will be selected.
          - or no answer, when not able to define the owner or group.
               In that situation another file owned by the same Win-
               dows user or group may be selected later so that a map-
               ping can be defined.

          The mappings for standard Windows users, such as "Adminis-
          trator" or "All Users" are defined implicitly. As a conse-
          quence a user mapping should never be defined as Linux root.

          When there are no more significant files, ntfsusermap create
          the mapping file into the file UserMapping in the current
          directory. This file has to be moved to the hidden directory
          .NTFS-3G in the root of all the NTFS file systems to be
          shared between Windows and Linux. This requires the file
          system to be mounted, but the created file will not be taken
          into account if not present at mount time, which means the

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     NTFSUSERMAP(8)           (February 2016)           NTFSUSERMAP(8)

          file system has to be unmounted and mounted again for the
          new mapping file to be taken into account.

          No option is defined for ntfsusermap.

          Map the users defined on the Windows system present on
          /dev/sda1 :

               ntfsusermap /dev/sda1

          A detailed example, with screen displays is available on

          ntfsusermap exits with a value of 0 when no error was
          detected, and with a value of 1 when an error was detected.

          Please see


          for common questions and known issues.  If you would find a
          new one in the latest release of the software then please
          send an email describing it in detail. You can contact the
          development team on the ntfs-3g-devel@lists.sf.net address.

          ntfs-3g.secaudit has been developed by Jean-Pierre André.

          Several people made heroic efforts, often over five or more
          years which resulted the ntfs-3g driver. Most importantly
          they are Anton Altaparmakov, Richard Russon, Szabolcs Sza-
          kacsits, Yura Pakhuchiy, Yuval Fledel, and the author of the
          groundbreaking FUSE filesystem development framework, Miklos

          ntfsprogs(8), attr(5), getfattr(1)

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