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+#############################
+Expected output for 'h5diff -d u h5diff_basic1.h5 h5diff_basic2.h5 g1/dset3 g1/dset4'
+#############################
+<-d u> is not a valid option
+usage: h5diff [OPTIONS] file1 file2 [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
+   -h, --help              Print a usage message and exit
+   -V, --version           Print version number and exit
+   -r, --report            Report mode. Print differences
+   -v, --verbose           Verbose mode. Print differences, list of objects
+   -q, --quiet             Quiet mode. Do not do output
+   -n C, --count=C         Print differences up to C number
+   -d D, --delta=D         Print difference when greater than limit D
+   -p R, --relative=R      Print difference when greater than relative limit R
+
+  C - is a positive integer
+  D - is a positive number. Compare criteria is |a - b| > D
+  R - is a positive number. Compare criteria is |(b-a)/a| > R
+
+ Modes of output:
+
+  Default mode: print the number of differences found and where they occured
+  -r Report mode: print the above plus the differences
+  -v Verbose mode: print the above plus a list of objects and warnings
+  -q Quiet mode: do not print output
+
+ Return exit code:
+
+  1 if differences found, 0 if no differences, -1 if error
+
+ 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 [obj1[obj2]] 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