Shorten the ybcon shell command script.

scripts/ybcon

@@ -23,11 +23,10 @@ usage() {
 usageExit() {
   usage false
   exit 0
-}
+}; helpExit() { usage true; exit 0; }
 
 args="";
 run=false;
-skipArgsIteration=false;
 
 newArgs() {
   if [ "$args" = "" ]; then
@@ -39,25 +38,23 @@ newArgs() {
 
 if [ "$#" != 0 ]; then
   if [ "$#" = 1 ]; then
-    if [ "$1" = "--version" ]; then
+    case "$1" in
-      run=true
+      -h | --help )
-      args="$1"
+        helpExit ;;
-      skipArgsIteration=true;
+      --version )
-    fi
+        run=true; args="$1" ;;
-  fi
+      *.ybcon )
-  if [ "$skipArgsIteration" = false ]; then
+        newArgs "$1"; run=true ;;
+      * )
+        usageExit ;;
+    esac
+  else
     for it in "$@"
       do
         case "$it" in
-        -h | --help | --version )
-          if [ "$#" = 1 ]; then usageExit; else
-            usage true; exit 0;
-          fi ;;
           -p | --printresult | --target=* )
             if test "${args#*$it}" = "$args"; then
-            if [ "$#" = 1 ]; then usage false; exit 0; else
               newArgs "$it"
-            fi
             else
               usageExit
             fi ;;
@@ -76,7 +73,7 @@ fi
 runIt() { eval "$1" " $args"; }
 
 if [ "$run" = true ]; then
-  if [ -f $defaultBinLocation ]; then
+  if [ -f "$defaultBinLocation" ]; then
     runIt "$defaultBinLocation"
   elif [ -f ybcon ]; then
     runIt "./ybcon"