Optimize shell

Author: kerner1000

src/main/resources/mac/startup.vtl

@@ -1,4 +1,4 @@
 #!/bin/bash
 # Mac OS X startup script generated by JavaPackager plugin
-SCRIPTPATH=`cd "$(dirname "$0")" ; pwd`
+SCRIPTPATH=$(cd "$(dirname "$0")" || return 1; pwd)
 osascript -e "do shell script quoted form of \"$SCRIPTPATH\" & \"/universalJavaApplicationStub $@\" with administrator privileges" &