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blkcat - Man Page

Display the contents of file system data unit in a disk image.


blkcat [-ahswvV] [-f fstype] [-u unit_size] [-i imgtype] [-o imgoffset] [-b dev_sector_size] image [images] unit_addr [num]


blkcat displays num data units (default is one) starting at the unit address unit_addr from image to stdout in different formats (default is raw). blkcat was called dcat in TSK versions prior to 3.0.0.



Display the contents in ASCII

-f fstype

Specify image as a specific file type.  If 'swap' is given here, the image will be displayed in pages of size 4096 bytes.  If 'raw' is given, then 512-bytes is used as the default size.  The '-u' flag can change the default size.   Use '-f list' to list the supported file system types. If not given, autodetection methods are used.


Display the contents in hexdump


Display statistics on the image (unit size, file block size,  and number of fragments).

-u unit_size

Specify the size of the default data unit for raw, blkls, and swap  images.

-i imgtype

Identify the type of image file, such as raw. Use '-i list' to list the supported types. If not given, autodetection methods are used.

-o imgoffset

The sector offset where the file system starts in the image.  

-b dev_sector_size

The size, in bytes, of the underlying device sectors.  If not given, the value in the image format is used (if it exists) or 512-bytes is assumed.


Verbose output to stderr.


Display version.


Display the contents in an HTML table format.  

image [images]

The disk or partition image to read, whose format is given with '-i'. Multiple image file names can be given if the image is split into multiple segments. If only one image file is given, and its name is the first in a sequence (e.g., as indicated by ending in '.001'), subsequent image segments will be included automatically.


Address of the disk unit to display.  The size of a unit on this  file system can be determined using the -s option.


Number of data units to display.

The basic functionality of blkcat can also be achieved using dd. To determine which inode has allocated a given unit, the ifind(1) command can be used.


# blkcat -hw image 264 4


# blkcat -hw image 264

See Also



Brian Carrier <carrier at sleuthkit dot org>

Send documentation updates to <doc-updates at sleuthkit dot org>