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:
       http://www.tuxera.com/community/

SEE ALSO

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

ntfs-3g 2017.3.23						     June 2014							   NTFSTRUNCATE(8)