NTFSTRUNCATE(8)             System Manager's Manual            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 equivalent 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 truncated. The attribute has to be
              specified by a number in decimal or hexadecimal :

              +-------------------------------------------+
              |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 multiplicative 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:
       https://github.com/tuxera/ntfs-3g/wiki/

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

ntfs-3g 2022.10.3                  June 2014                   NTFSTRUNCATE(8)