Index: trunk/Ohana/src/opihi/cmd.astro/cgrid.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.astro/cgrid.c	(revision 41269)
+++ trunk/Ohana/src/opihi/cmd.astro/cgrid.c	(revision 41322)
@@ -83,4 +83,7 @@
   Graphdata graphmode;
 
+  if ((N = get_argument (argc, argv, "-h"))) goto usage;
+  if ((N = get_argument (argc, argv, "--help"))) goto usage;
+
   RAbyHour = FALSE;
   if ((N = get_argument (argc, argv, "-ra-by-hour"))) {
@@ -151,8 +154,5 @@
   if (!style_args (&graphmode, &argc, argv, &kapa)) return FALSE;
 
-  if (argc != 1) {
-    gprint (GP_ERR, "USAGE: cgrid [style] [-ra-by-hour] [-labels]\n");
-    return (FALSE);
-  }
+  if (argc != 1) goto usage;
 
   /* are we plotting one of the poles? */
@@ -346,3 +346,24 @@
   return (TRUE);
 
+ usage:
+
+  gprint (GP_ERR, "USAGE: cgrid [style] [options]\n");
+  gprint (GP_ERR, "  options:\n");
+  gprint (GP_ERR, "  -h, --help: show this list\n");
+  gprint (GP_ERR, "  -ra-by-hour : RA grid lines will be space on rounded hour lines (default is degrees)\n");
+  gprint (GP_ERR, "  -labels : add RA & dec coordinates\n");
+  gprint (GP_ERR, "  -major-spacing : grid lines drawn at major tickmarks, not minor tickmarks\n");
+  gprint (GP_ERR, "  -ra-spacing : specify size of RA grid steps in degrees (ignores -ra-by-hour)\n");
+  gprint (GP_ERR, "  -dec-spacing : specify size of dec grid steps in degrees\n");
+  gprint (GP_ERR, "  -justify-ra : choose how RA labels are justified (see below)\n");
+  gprint (GP_ERR, "  -justify-dec : choose how dec labels are justified (see below)\n");
+  gprint (GP_ERR, "  -label-ra : RA coordinate of the Dec-line labels\n");
+  gprint (GP_ERR, "  -label-dec : Dec coordinate of the RA-line labels\n");
+  gprint (GP_ERR, "  -label-color : color for the labels (independent of grid lines)\n");
+  gprint (GP_ERR, "  text justification: text is justified horizontally and vertically based on the following numbers:\n");
+  gprint (GP_ERR, "   6 7 8\n");
+  gprint (GP_ERR, "   3 4 5\n");
+  gprint (GP_ERR, "   0 1 2\n");
+  return (FALSE);
 }
+