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NTFSTRUNCATE(8)						       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 pre‐
       ceded 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	speci‐
	      fied 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)

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