hdfls (1)

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 number.

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:

        aa.hdf:

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:

        aa.hdf:

        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

hdf(5)