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+#############################
+Expected output for 'h5diff -n h5diff_basic1.h5 h5diff_basic2.h5 g1/dset3 g1/dset4'
+#############################
+<-n h5diff_basic1.h5> 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