Index: trunk/Ohana/src/opihi/cmd.data/swapbytes.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.data/swapbytes.c	(revision 2598)
+++ trunk/Ohana/src/opihi/cmd.data/swapbytes.c	(revision 7917)
@@ -8,5 +8,5 @@
 
   if (argc != 2) {
-    fprintf (stderr, "USAGE: swapbytes <buffer>\n");
+    gprint (GP_ERR, "USAGE: swapbytes <buffer>\n");
     return (FALSE);
   }
@@ -17,5 +17,5 @@
   ny = buf[0].matrix.Naxis[1];
 
-  fprintf (stderr, "npix: %d\n", nx*ny);
+  gprint (GP_ERR, "npix: %d\n", nx*ny);
 
   V = buf[0].matrix.buffer;