Author: <hesso@pool.math.tu-berlin.de>
Description: Distinguish between invalid commandline parameters and '-?'.
Index: b/pgrep.c
===================================================================
--- a/pgrep.c	2009-11-24 21:00:45.000000000 +1100
+++ b/pgrep.c	2009-11-24 21:00:49.000000000 +1100
@@ -681,7 +681,7 @@
 //		case 'z':   // Solaris: match by zone ID
 //			break;
 		case '?':
-			usage (opt);
+			usage (optopt?optopt:opt);
 			break;
 		}
 	}