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hrepack(1) hrepack(1)

NAME

hrepack - copies an HDF file to a new file

SYNOPSIS


hrepack
-i input -o output [-V] [-h] [-v] [ -t comp_info] [-c chunk_info] [-f cfile] [-m size]

DESCRIPTION

hrepack copies an HDF file to a new file with/without compression and/or chunking.

OPTIONS

-i input
input HDF File
-o output
output HDF File
-V
prints version of the HDF4 library and exits
-h
prints usage information
-v
verbose mode
-t comp_info
compression type: 'comp_info' is a string with the format <object list>:<type of compression><parameters>
<object list> is a comma separated list of object names meaning apply compression only to those objects. '*' means all objects.
<type of compression> can be:
RLE
for RLE compression
HUFF
for Huffman
GZIP
for gzip
JPEG
for JPEG (for images only)
SZIP
for szip
NONE
to uncompress
<parameters> is optional compression info
RLE
no parameter
HUFF
the skip-size
GZIP
the deflation level
JPEG
the quality factor
SZIP
pixels per block, compression mode (NN or EC)
-c chunk_info
apply chunking. chunk_info is a string with the format <object list>:<chunk information>
<object list> is a comma separated list of object names meaning apply chunking only to those objects. '*' means all objects
<chunk information> is the chunk size of each dimension: dim_1 x dim_2 x ... dim_n or NONE, to unchunk a previous chunked object
-f cfile
file with compression information -t and -c
-m size
do not compress objects smaller than size (bytes)

EXAMPLES

compresses all objects in the file file1.hdf, using RLE compression
hrepack -v -i file1.hdf -o file2.hdf -t '*:RLE'
      
applies Skipping Huffman compression with skip factor of 1, for objects /group1/A, /group2/B and C
hrepack -v -i file1.hdf -o file2.hdf -t '/group1/A,/group2/B,C:HUFF 1'
      
applies RLE compression for object /group1/D.
applies chunking to objects D and E using a chunk size of 10 for the 2 dimensions
hrepack -v -i file1.hdf -o file2.hdf -t '/group1/D:RLE' -c 'D,E:10x10'
      
uncompresses object A
hrepack -v -i file1.hdf -o file2.hdf -t 'A:NONE'
      
applies SZIP compression to object A, with parameters 8 and NN
hrepack -v -i file1.hdf -o file2.hdf -t 'A:SZIP 8,NN'
      
Note: the use of the verbose option -v is recommended
28 May 2016