NTFSTRUNCATESection: Maintenance Commands (8)
Updated: June 2014
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NAMEntfstruncate - truncate a file on an NTFS volume
SYNOPSISntfstruncate [options] device file [attr-type [attr-name]] new-length
DESCRIPTIONntfstruncate truncates (or extends) a specified attribute belonging to a file or directory, to a specified length.
OPTIONSBelow 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.
- 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.
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"
Define the name of the particular attribute type to be truncated
(advanced use only).
- 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.
EXAMPLESResize 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
BUGSThere are no known problems with ntfstruncate. If you find a bug, please send an email describing the problem to the development team:
AUTHORSntfstruncate was written by Anton Altaparmakov.
AVAILABILITYntfstruncate is part of the ntfs-3g package and is available from:
SEE ALSOntfs-3g(8), ntfsfallocate(8), ntfsprogs(8).
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