ntfstruncate(8)

1NTFSTRUNCATE(8)             System Manager's Manual            NTFSTRUNCATE(8)
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NAME

6       ntfstruncate - truncate a file on an NTFS volume
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SYNOPSIS

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

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

16       Below is a summary  of  all  the  options  that  ntfstruncate  accepts.
17       Nearly  all  options have two equivalent names.  The short name is pre‐
18       ceded by - and the long name is preceded  by  --.   Any  single  letter
19       options,  that  don't  take  an argument, can be combined into a single
20       command, e.g.  -fv is equivalent to -f -v.  Long named options  can  be
21       abbreviated to any unique prefix of their name.
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23       -f, --force
24              This  will  override some sensible defaults, such as not using a
25              mounted volume.  Use this option with caution.
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27       -h, --help
28              Show a list of options with a brief description of each one.
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30       -l     Display licensing information.
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32       -n, --no-action
33              Simulate the truncation without actually write to device.
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35       -q, --quiet
36              Suppress some debug/warning/error messages.
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38       -v, --verbose
39              Display more debug/warning/error messages.
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41       -V, --version
42              Show the version number, copyright and license of ntfstruncate.
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44       attr-type
45              Define a particular attribute type to be truncated (advanced use
46              only).  By default, the unnamed $DATA attribute (the contents of
47              a plain file) will be truncated. The attribute has to be  speci‐
48              fied by a number in decimal or hexadecimal :
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50              ┌───────────────────────────────────────────┐
51              │Hex     Decimal   Name                     │
52              │0x10    16        "$STANDARD_INFORMATION"  │
53              │0x20    32        "$ATTRIBUTE_LIST"        │
54              │0x30    48        "$FILE_NAME"             │
55              │0x40    64        "$OBJECT_ID"             │
56              │0x50    80        "$SECURITY_DESCRIPTOR"   │
57              │0x60    96        "$VOLUME_NAME"           │
58              │0x70    112       "$VOLUME_INFORMATION"    │
59              │0x80    128       "$DATA"                  │
60              │0x90    144       "$INDEX_ROOT"            │
61              │0xA0    160       "$INDEX_ALLOCATION"      │
62              │0xB0    176       "$BITMAP"                │
63              │0xC0    192       "$REPARSE_POINT"         │
64              │0xD0    208       "$EA_INFORMATION"        │
65              │0xE0    224       "$EA"                    │
66              │0xF0    240       "$PROPERTY_SET"          │
67              │0x100   256       "$LOGGED_UTILITY_STREAM" │
68              └───────────────────────────────────────────┘
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70       attr-name
71              Define the name of the particular attribute type to be truncated
72              (advanced use only).
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75       new-length
76              Specify the target size of the file.  It will be rounded up to a
77              multiple  of  the  cluster size.  A suffix of K, M, G, T, P or E
78              may be appended to mean a multiplicative factor of  a  power  of
79              1000.  Similarly  a  suffix  of  Ki, Mi, Gi, Ti, Pi or Ei may be
80              appended to mean a multiplicative factor of a power of 1024.
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EXAMPLES

83       Resize to 100MB the file database.db  located  in  the  Data  directory
84       which is at the root of an NTFS file system.
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86              ntfstruncate /dev/sda1 Data/database.db 100M
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BUGS

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

95       ntfstruncate was written by Anton Altaparmakov.
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AVAILABILITY

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