Hello everybody,
I will tell you mi experience. After put uncompressed folder XMLPortletFactory on SDK folder I try with XMLPortletFactory JAR directly:

liferay-sdk $ cd XMLPortletFactory
XMLPortletFactory $ java -jar XMLPortletFactory.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xmlbeans/XmlException
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2615)
    at java.lang.Class.getMethod0(Class.java:2856)
    at java.lang.Class.getMethod(Class.java:1668)
    at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)
Caused by: java.lang.ClassNotFoundException: org.apache.xmlbeans.XmlException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 6 more

After that try by console:

XMLPortletFactory $ ./create.sh hello-world \"Hello World\"
-bash: ./create.sh: Permission denied

FIRST TIP: Add permissions

XMLPortletFactory $ chmod 777 create.sh
XMLPortletFactory $ ./create.sh hello-world \"Hello World\"
-bash: ./create.sh: /bin/sh^M: bad interpreter: No such file or directory

Looking what errors mean, see create.sh code then I found this:
ant -Dportlet.name=$1 -Dportlet.display.name=\"$2\" -Dportlet.filename=$1 create

XMLPortletFactory $ ant -version
-bash: ant: command not found

I discover that ANT is missing by console...
SECOND TIP: ANT dependecy by console on Mac installation. You can use ANT traditional installation or use Homebrew (like me).

XMLPortletFactory $ brew update
XMLPortletFactory $ brew install ant
XMLPortletFactory $ ant -version
Apache Ant(TM) version 1.9.5 compiled on May 31 2015
XMLPortletFactory $ ./create.sh hello-world \"Hello World\"
-bash: ./create.sh: /bin/sh^M: bad interpreter: No such file or directory

Then try again with ANT comand directly:
THIRD TIP: User ANT command directly.

XMLPortletFactory $ ant -Dportlet.name=hello-world -Dportlet.display.name=\"Hello World\" -Dportlet.filename=hello-world create
Buildfile: /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory/build.xml
create:
send-warning:
create-libs-folder:
    Expanding: /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory/XMLPortlet_resources.zip into /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory
create-resources-folder:
    Expanding: /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory/XMLPortlet_resources.zip into /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory
create-taglibs-folder:
     Copying 6 files to /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory/Resources/PortletStructureAndFiles/docroot/WEB-INF/tld
create-portlet:
    Expanding: /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory/XMLPortlet_resources.zip into /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory/hello-world-xmlportletfactory
     Copying 1 file to /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory/hello-world-xmlportletfactory
     Moving 1 file to /Users/myuser/workspaces/liferay-sdk/XMLPortletFactory/hello-world-xmlportletfactory
BUILD SUCCESSFUL
Total time: 8 seconds

... a little of work, but I get it.