SYNOPSIS

hdiff [-V] [-b] [-g] [-s] [-d] [-D] [-S] [-v var1[,...]] [-u var1[,...]] [-e count] [-t limit] [-p relative] file1 file2

DESCRIPTION

hdiff compares two HDF files and reports the differences.

OPTIONS

-V

Display version of the HDF4 library and exit

-b

Verbose mode

-g

Compare global attributes only

-s

Compare SD local attributes only

-d

Compare SD data only

-D

Compare Vdata data only

-S

Print statistics

-v var1[,...]

Compare SD data on variable(s) var1,... only

-u var1[,...]

Compare vdata on variable(s) var1,... only

-e count

Print difference up to count number for each variable

-t limit

Print difference when it is greater than limit

-p relative

Print difference when it is greater than a relative limit

file1

File name of the first HDF file

file2

File name of the second HDF file

The 'count' value must be a positive integer

The 'limit' and 'relative' values must be positive numbers

The -t compare criteria is |a - b| > limit

The -p compare criteria is |(b-a)/a| > relative

Return codes: 0 (no differences found), 1 (differences found)