NTFSTRUNCATE(8)            (June 2014)            NTFSTRUNCATE(8)

     NAME
          ntfstruncate - truncate a file on an NTFS volume

     SYNOPSIS
          ntfstruncate [options] device file [attr-type [attr-name]]
          new-length

     DESCRIPTION
          ntfstruncate truncates (or extends) a specified attribute
          belonging to a file or directory, to a specified length.

     OPTIONS
          Below is a summary of all the options that ntfstruncate
          accepts.  Nearly all options have two equivalent names.  The
          short name is preceded by - and the long name is preceded by
          --.  Any single letter options, that don't take an argument,
          can be combined into a single command, e.g.  -fv is equiva-
          lent to -f -v.  Long named options can be abbreviated to any
          unique prefix of their name.

          -f, --force
               This will override some sensible defaults, such as not
               using a mounted volume.  Use this option with caution.

          -h, --help
               Show a list of options with a brief description of each
               one.

          -l   Display licensing information.

          -n, --no-action
               Simulate the truncation without actually write to
               device.

          -q, --quiet
               Suppress some debug/warning/error messages.

          -v, --verbose
               Display more debug/warning/error messages.

          -V, --version
               Show the version number, copyright and license of
               ntfstruncate.

          attr-type
               Define a particular attribute type to be truncated
               (advanced use only).  By default, the unnamed $DATA
               attribute (the contents of a plain file) will be trun-
               cated. The attribute has to be specified by a number in
               decimal or hexadecimal : box; lB lB lB l l l.

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     NTFSTRUNCATE(8)            (June 2014)            NTFSTRUNCATE(8)

               Hex  Decimal   Name 0x10 16   "$STANDARD_INFORMATION"
               0x20 32   "$ATTRIBUTE_LIST" 0x30 48   "$FILE_NAME"
               0x40 64   "$OBJECT_ID" 0x50 80   "$SECURITY_DESCRIPTOR"
               0x60 96   "$VOLUME_NAME"
               0x70 112  "$VOLUME_INFORMATION" 0x80 128  "$DATA"
               0x90 144  "$INDEX_ROOT" 0xA0 160  "$INDEX_ALLOCATION"
               0xB0 176  "$BITMAP" 0xC0 192  "$REPARSE_POINT"
               0xD0 208  "$EA_INFORMATION" 0xE0 224  "$EA"
               0xF0 240  "$PROPERTY_SET"
               0x100     256  "$LOGGED_UTILITY_STREAM"

          attr-name
               Define the name of the particular attribute type to be
               truncated (advanced use only).

          new-length
               Specify the target size of the file.  It will be
               rounded up to a multiple of the cluster size.  A suffix
               of K, M, G, T, P or E may be appended to mean a multi-
               plicative factor of a power of 1000. Similarly a suffix
               of Ki, Mi, Gi, Ti, Pi or Ei may be appended to mean a
               multiplicative factor of a power of 1024.

     EXAMPLES
          Resize to 100MB the file database.db located in the Data
          directory which is at the root of an NTFS file system.

               ntfstruncate /dev/sda1 Data/database.db 100M

     BUGS
          There are no known problems with ntfstruncate.  If you find
          a bug, please send an email describing the problem to the
          development team:
          ntfs-3g-devel@lists.sf.net

     AUTHORS
          ntfstruncate was written by Anton Altaparmakov.

     AVAILABILITY
          ntfstruncate is part of the ntfs-3g package and is available
          from:
          http://www.tuxera.com/community/

     SEE ALSO
          ntfs-3g(8), ntfsfallocate(8), ntfsprogs(8).

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