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+#############################
+Expected output for 'h5diff file1.h5 file2.h5 -p 0x1 g1/dset3 g1/dset4'
+#############################
+$h5diff file1.h5 file2.h5 -p 0x1 g1/dset3 g1/dset4
+<-p 0x1> is not a valid 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]              Print only what objects differ, not the differences
+[-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 error
+
+Items in [] are optional
+[obj1] and [obj1] are HDF5 objects (datasets, groups or datatypes)
+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 |1 - b/a| > relative
+
+Examples:
+
+1) h5diff file1 file2 /a/b /a/c
+
+   Compares object '/a/b' in file1 with '/a/c' in file2
+
+2) h5diff file1 file2 /a/b
+
+   Compares object '/a/b' in both files
+
+3) h5diff file1 file2
+
+   Compares all objects in both files
+