Index: trunk/Ohana/src/opihi/cmd.data/kern.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.data/kern.c	(revision 3105)
+++ trunk/Ohana/src/opihi/cmd.data/kern.c	(revision 3261)
@@ -1,4 +1,5 @@
 # include "data.h"
 
+/** need to allow larger kernels (5x5, 7x7, etc) **/
 int kern (int argc, char **argv) {
 
@@ -40,4 +41,8 @@
     /* file */
     f = fopen (argv[2], "r");
+    if (f == NULL) {
+      fprintf (stderr, "file not found: %s\n", argv[2]);
+      return (FALSE);
+    }
     for (i = 0; i < 3; i++) {
       status = scan_line (f, line);