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hdfls - list basic information about an HDF file


hdfls [-o] [-l] [-d] [-v] [-g] [-s] [-h] [-t n] hdf_file


hdfls provides general information about the tags, reference numbers, and if requested,
lengths of the data elements.


-o display the reference numbers in ascending order.

-l long format. Display more information about the file.

-d Display offset and length information for each element in the file.

-v verbose. Display annotation and label text, along with the format triggered by the
-l flag.

-g Group. List items by group.

-s Special elements. Display detailed information about special elements.

-d Display offset and length information for each element in the file.

-h Dump DD block information.

-t n Tag. Only list information about the specified tag. Must be followed by a tag


A file called "aa.hdf" contains three items associated with a raster image; the image
dimensions, a palette, and the raster image. To display information about the contents of
this file, the following command is used.

hdfls aa.hdf

The following output is displayed:


Image Dimensions-8: (Raster-8): (tag 200)

Ref nos: 1

Image Palette-8: (Raster-8): (tag 201)

Ref nos: 3

Raster Image-8: (Raster-8): (tag 202)

Ref nos: 1

The following displays the same information with the length of each data element:

hdfls -l aa.hdf

This would result in the following information being displayed:


Image Dimensions-8: (Raster-8) : (tag 200)

Ref no 1 4 bytes

Image Palette-8: (Raster-8) : (tag 201)

Ref no 3 768 bytes

Raster Image-8: (Raster-8) : (tag 202)

Ref no 1 120000 bytes

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