Show the usage message when -p/--printresult is repeated.

scripts/ybcon.sh

@@ -17,6 +17,7 @@ usage() {
   fi
 }
 
+pUsed=false
 args="";
 run=false;
 skipArgsIteration=false;
@@ -48,8 +49,13 @@ if [ "$#" != 0 ]; then
           usage false
           exit 0 ;;
         -p | --printresult )
-          newArgs "$it"
+          if [ $pUsed = false ]; then
-          shift ;;
+            pUsed=true
+            newArgs "$it"
+          else
+            usage false
+            exit 0
+          fi ;;
         *.ybcon )
           newArgs "$it"
           run=true