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+#############################
+Expected output for 'h5diff h5diff_basic1.h5 h5diff_basic2.h5 -p -4 g1/dset3 g1/dset4'
+#############################
+Not a valid -p option
+usage: h5diff file1 file2 [OPTIONS] [obj1[obj2]] 
+
+file1             File name of the first HDF5 file
+file2             File name of the second HDF5 file
+[obj1]            Name of an HDF5 object, in absolute path
+[obj2]            Name of an HDF5 object, in absolute path
+[OPTIONS] are:
+[-h]              Print out this information
+[-r]              Report mode. Print differences
+[-v]              Verbose mode. Print differences, list of objects, warnings
+[-q]              Quiet mode. Do not do output
+[-n count]        Print difference up to count number
+[-d delta]        Print difference when it is greater than limit delta
+[-p relative]     Print difference when it is greater than a relative limit
+
+Items in [] are optional
+[obj1] and [obj2] are HDF5 objects (datasets, groups, datatypes or links)
+The 'count' value must be a positive integer
+The 'delta' and 'relative' values must be positive numbers
+The -d compare criteria is |a - b| > delta
+The -p compare criteria is |(b-a)/a| > relative
+
+h5diff has four modes of output:
+ Normal mode: print the number of differences found and where they occured
+ Report mode: print the above plus the differences
+ Verbose mode: print the above plus a list of objects and warnings
+ Quiet mode: do not print output (h5diff always returns an exit code of 1 when differences are found)
+
+Examples of use:
+
+1) h5diff file1 file2 /g1/dset1 /g1/dset2
+
+   Compares object '/g1/dset1' in file1 with '/g1/dset2' in file2
+
+2) h5diff file1 file2 /g1/dset1
+
+   Compares object '/g1/dset1' in both files
+
+3) h5diff file1 file2
+
+   Compares all objects in both files
+
+Note)  file1 and file2 can be the same file. Use
+
+   h5diff file1 file1 /g1/dset1 /g1/dset2
+
+   to compare '/g1/dset1' and '/g1/dset2' in the same file
+
+If no objects are specified, h5diff only compares objects with the same absolute path in both files. The compare criteria is: 1) datasets: numerical array differences 2) groups: name string difference 3) datatypes: the return value of H5Tequal 2) links: name string difference of the linked value