give some better help on how to use the hdf5_extract utilitiy program

git-svn-id: http://svn.cactuscode.org/arrangements/CactusPUGHIO/IOHDF5/trunk@230 4825ed28-b72c-4eae-9704-e50c059e567d

1 files changed, 6 insertions, 1 deletions

diff --git a/src/util/hdf5_extract.c b/src/util/hdf5_extract.c
index db4391b..4029472 100644
--- a/src/util/hdf5_extract.c
+++ b/src/util/hdf5_extract.c
@@ -102,7 +102,12 @@ int main (int argc, char *argv[])
   if (argc != 4)
   {
     fprintf (stderr, "Usage: %s <listfile> <infile> <outfile>\n", argv[0]);
-    fprintf (stderr, "   eg, %s extract_list alp.h5 alp_extract.h5\n\n", argv[0]);
+    fprintf (stderr, "       where <listfile> can be created from the output of the h5ls command\n\n");
+    fprintf (stderr, "   eg, h5ls alp.h5 > listfile\n"
+                     "       # now edit listfile to select all datasets to be extracted\n"
+                     "       # (don't forget to remove backslashes and the trailing 'Dataset {...}')\n"
+                     "       %s extract_list alp.h5 alp_extract.h5\n\n", argv[0]);
+
     return (0);
   }